SIST ES 283 027 V2.4.0:2008

• Abstract:

  The present document provides the ETSI endorsement of the 3GPP TS 29.163 [1].; Clauses 7.2.3 and 7.4 of 3GPP TS 29.163 [1] specify the signalling interworking between ISDN User Part (ISUP) protocols and SIP in order to support services that can be commonly supported by ISUP and SIP-based network domains. Clause 9.2.3.3.5 specifies how ringing tone is applied at the gateway when interworking ISUP and SIP. The present document specifies the principles of interworking between the ETSI TISPAN IMS and ISUP based legacy CS networks, in order to support IM basic voice calls, therefore all the references to interworking between IMS and BICC are out of scope of the present document. The present document is a protocol interworking specification; therefore all references to the user plane interworking are out of scope of the present document. The present document specifies the interworking between ETSI SIP profile (as specified within ES 283 003 [3]) and ISUP, as specified in EN 300 356-1 [2] respectively.

• Status: Published
• Publication Date: 01-Jun-2008
• ICS: 33.040.01 - Telecommunication systems in general
• ICS: 33.080 - Integrated Services Digital Network (ISDN)
• Technical Committee: SPN - Services and Protocols for Networks
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 23-Apr-2008
• Due Date: 28-Jun-2008
• Completion Date: 02-Jun-2008
• Ref Project: ETSI ES 283 027 V2.4.0 (2008-04) - Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); Endorsement of the SIP-ISUP Interworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networks [3GPP TS 29.163 (Release 7), modified]

SIST ES 283 027 V2.4.0:2008 is the Slovenian version of ETSI ES 283 027 V2.4.0. It defines SIP-ISUP interworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networks, with a focus on signaling for IM basic voice calls and related supplementary-service behavior.

The document is aimed at implementers and operators of TISPAN IMS and ISUP-based legacy CS networks, especially gateway functions that translate signaling between SIP and ISUP.

What does SIST ES 283 027 V2.4.0:2008 specify?

SIST ES 283 027 V2.4.0:2008 endorses 3GPP TS 29.163 Release 7 and applies ETSI modifications to that baseline. It specifies protocol interworking, not user-plane interworking, so it is about signaling behavior at the gateway rather than media transport itself.

The scope is the interworking between the ETSI SIP profile in ES 283 003 and ISUP as specified in EN 300 356-1. It also keeps the focus on IM basic voice calls, while interworking with IMS and BICC is outside the document’s scope.

Annex	What it covers
Annex A	Change history
Annex D	Bibliography

The main structure is clause 1 on scope, clause 2 on references, clause 3 on definitions and abbreviations, followed by the endorsement notice and the global modifications to 3GPP TS 29.163 Release 7.

What are the key requirements of SIST ES 283 027 V2.4.0:2008?

Signaling and media interworking

The document’s core requirement is to map SIP-side call control to ISUP-side call control, and vice versa, using the ETSI SIP profile and ISUP parameters. In practice, that means the gateway has to translate call setup, progress, release, and supplementary-service signaling consistently across the two network domains.

Clause 7.2.3.1.2.5 describes how the I-MGCF handles transmission medium requirements. If it transcodes, it selects the TMR parameter “3,1 kHz audio”; if it does not transcode, it maps TMR, USI and Access Transport parameters from the selected codec. This matters because codec handling decides whether the call can be passed through unchanged or needs media conversion.

The document also adds fallback behavior in clause 7.2.3.1.2.5a. When an INVITE carries multiple audio codecs and an XML Bearer Capability element, the gateway compares the offered codecs with the XML Bearer Capability information and maps the matching codec into TMR prime and USI prime as appropriate. If the fallback mechanism is not supported in the terminating network, the normal transmission-medium procedures apply. For implementers, this means codec order and bearer-capability content can change which codec is actually used on the CS side.

Progress, ringback, and early media

Clause 7.2.3.1.4 and clause 7.2.3.1.4A define how the gateway sends 180 Ringing and 183 Session Progress. The gateway sends 180 Ringing when it receives ACM or CPG messages with the stated alerting conditions, and it may include the P-Early-Media header when that header is supported and present in the INVITE. This is important because it controls when the caller hears ringback or announcement media from the CS network.

The document also covers early-media scenarios with SIP preconditions. In those cases, the first 183 Session Progress can be sent before any ISUP message is received, but the gateway must wait for an ISUP ACM before including P-Early-Media. That detail matters in networks that reserve resources before media is allowed to flow.

The progress-indicator clauses map PSTN XML elements and ISUP progress information between ACM, CPG, 180 Ringing, and 183 Session Progress. The practical result is that progress indicators received from the CS side can be carried back into SIP-side XML bodies for the calling user.

Call clearing and error mapping

Clauses 7.2.3.1.5 to 7.2.3.1.8 define how the gateway handles call completion and release. ANM or CON can trigger 200 OK (INVITE), while BYE or CANCEL can trigger REL on the ISUP side. If a Reason header with Q.850 Cause Value is present, the gateway maps that cause into the ISUP REL cause value.

When a REL is received, the gateway responds differently depending on whether 200 OK (INVITE) has already been sent. If it has, the gateway sends BYE; if not, it sends an appropriate 4xx or 5xx SIP response based on the received Q.850 cause value. This matters for call state consistency, because the SIP and ISUP sides must agree on whether the call is already established.

Clause 7.2.3.2.12 extends that logic for 4xx, 5xx and 6xx SIP responses on the outgoing side. If a Reason header is present, its Q.850 cause value is used; otherwise the SIP status code is mapped to an ISUP REL cause code. For operations teams, this is the part that keeps diagnostics and release causes readable across both signaling systems.

Subaddressing and UUS

Clause 7.4.5 covers Sub-addressing (SUB). It maps the isdn-Subaddress parameter in tel or sip URIs to the ISUP Access Transport Parameter, and also maps the reverse direction from ANM to 200 OK (INVITE). This is important when a network uses subaddress information for routing or endpoint identification.

Clause 7.4.21 covers User-to-User Signalling (UUS). For UUS service 1, the User-to-User header in SIP carries the ISUP user-user information element content in hex form, and the gateway maps the protocol discriminator and user information between the two sides. That matters for applications that carry user data inside the signaling path.

What terms does SIST ES 283 027 V2.4.0:2008 define?

• Session Initiation Protocol (SIP) - The signaling protocol used on the IMS side for call setup, progress, and release.
• ISDN User Part (ISUP) - The SS7 signaling protocol used on the CS side for call control and supplementary services.
• Transmission Medium Requirement (TMR) - The ISUP parameter that describes the bearer requirement, such as audio mode or unrestricted 64 kbit/s transport.
• User Service Information (USI) - The ISUP parameter used with bearer capability information when mapping media requirements.
• P-Early-Media - A SIP header used to authorize early media before call answer.
• Access Transport Parameter - The ISUP parameter that carries items such as progress indicator, high/low layer compatibility, and subaddressing in this document.
• User-to-User Signalling (UUS) - A service that transports user-user information between SIP and ISUP signaling.
• XML Bearer Capability - The XML element used in the SIP side to carry bearer capability information for mapping into ISUP parameters.

Who uses SIST ES 283 027 V2.4.0:2008?

The document is used by IMS and CS network engineers who design SIP-ISUP interworking at gateways such as the I-MGCF and O-MGCF. It is also used by service providers and operators who need basic voice calls to work across IMS and legacy circuit-switched networks.

Quality and test teams use it to verify signaling interworking, cause-code mapping, progress-indicator handling, early-media behavior, subaddressing, and UUS transport. Equipment vendors use it to implement interoperable gateway behavior against ETSI SIP profile and ISUP requirements.

What changed in SIST ES 283 027 V2.4.0:2008 from the previous edition?

This version is a modified endorsement of 3GPP TS 29.163 Release 7. The change history and global modifications show updates for SUB mapping, corrections to sub-addressing interworking, UUS interworking description, progress-indicator mapping, fallback behavior, and SIP XML transit-specific interworking.

The document also replaces several references throughout the base text, including the ISUP and SIP-related ETSI references used in the interworking rules.

Which standards are used with SIST ES 283 027 V2.4.0:2008?

Standard	What it contributes
3GPP TS 29.163	Base interworking specification endorsed and modified by this document
ES 283 003	ETSI SIP profile and PSTN XML handling used in the mappings
ES 282 007	IMS functional architecture reference
EN 300 356-1	ISUP basic services and SS7 ISUP framework
EN 300 356-3 to EN 300 356-21	ISUP supplementary services such as CLIP, CLIR, COLP, COLR, TP, UUS, CUG, SUB, MCID, CONF, ECT, Diversion, HOLD, CW, CCBS, 3PTY, CCNR and ACR
EN 300 485	Q.850 cause and location coding
EN 300 403-1	DSS1 signaling network layer and ISUP subaddress coding
IETF RFC 3966	tel URI and isdn-Subaddress syntax
IETF RFC 3312, RFC 3267, RFC 3556, RFC 5009, RFC 5079	Preconditions, AMR codec transport, bandwidth modifiers, P-Early-Media, and Anonymity Disallowed behavior used in the call-handling clauses

What does the SIST ES 283 027 V2.4.0:2008 document contain?

The document contains mapping tables for SIP, SDP, PSTN XML and ISUP parameters, including codec-related handling, progress indicators, cause codes, and subaddressing. It also includes call-flow figures for receipt of ACM, CPG, ANM, CON, BYE, CANCEL, and 4xx/5xx/6xx responses.

It gives procedures for early media, ringback, fallback codec selection, and release-cause translation. For implementation work, these tables and figures are the parts used to code gateway behavior and to verify interworking in tests.

Annex A provides the change history, and Annex D lists a bibliography item used for UUS-related work.

Final draft ETSI ES 283 027 V2.4.0 (2008-01)
ETSI Standard
Telecommunications and Internet converged Services and
Protocols for Advanced Networking (TISPAN);
Endorsement of the SIP-ISUP Interworking between the
IP Multimedia (IM) Core Network (CN) subsystem
and Circuit Switched (CS) networks
[3GPP TS 29.163 (Release 7), modified]

2 Final draft ETSI ES 283 027 V2.4.0 (2008-01)

Reference
RES/TISPAN-03119-NGN-R2
Keywords
endorsement, interworking, ISUP, SIP
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ETSI
3 Final draft ETSI ES 283 027 V2.4.0 (2008-01)
Contents
Intellectual Property Rights.4
Foreword.4
1 Scope.5
2 References.5
2.1 Normative references.5
3 Definitions and abbreviations.8
Endorsement notice .8
Global modifications to 3GPP TS 29.163 Release 7.8
Annex A (informative): Change history .26
History .27

ETSI
4 Final draft ETSI ES 283 027 V2.4.0 (2008-01)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
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Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This ETSI Standard (ES) has been produced by ETSI Technical Committee Telecommunications and Internet
converged Services and Protocols for Advanced Networking (TISPAN), and is now submitted for the ETSI standards
Membership Approval Procedure.
ETSI
5 Final draft ETSI ES 283 027 V2.4.0 (2008-01)
1 Scope
The present document provides the ETSI endorsement of the 3GPP TS 29.163 [1].
Clauses 7.2.3 and 7.4 of 3GPP TS 29.163 [1] specify the signalling interworking between ISDN User Part (ISUP)
protocols and SIP in order to support services that can be commonly supported by ISUP and SIP-based network
domains.
Clause 9.2.3.3.5 specifies how ringing tone is applied at the gateway when interworking ISUP and SIP.
The present document specifies the principles of interworking between the ETSI TISPAN IMS and ISUP based legacy
CS networks, in order to support IM basic voice calls, therefore all the references to interworking between IMS and
BICC are out of scope of the present document.
The present document is a protocol interworking specification; therefore all references to the user plane interworking
are out of scope of the present document.
The present document specifies the interworking between ETSI SIP profile (as specified within ES 283 003 [3]) and
ISUP, as specified in EN 300 356-1 [2] respectively.
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• Non-specific reference may be made only to a complete document or a part thereof and only in the following
cases:
- if it is accepted that it will be possible to use all future changes of the referenced document for the
purposes of the referring document;
- for informative references.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
For online referenced documents, information sufficient to identify and locate the source shall be provided. Preferably,
the primary source of the referenced document should be cited, in order to ensure traceability. Furthermore, the
reference should, as far as possible, remain valid for the expected life of the document. The reference shall include the
method of access to the referenced document and the full network address, with the same punctuation and use of upper
case and lower case letters.
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
2.1 Normative references
The following referenced documents are indispensable for the application of the present document. For dated
references, only the edition cited applies. For non-specific references, the latest edition of the referenced document
(including any amendments) applies.
[1] 3GPP TS 29.163: "3rd Generation Partnership Project; Technical Specification Group Core
Network and Terminals; Interworking between the IP Multimedia (IM) Core Network (CN)
subsystem and Circuit Switched (CS) networks (Release 7)".
[2] ETSI EN 300 356-1 (V4.2.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 1: Basic services
[ITU-T Recommendations Q.761 to Q.764 (1999) modified]".
ETSI
6 Final draft ETSI ES 283 027 V2.4.0 (2008-01)
[3] ETSI ES 283 003: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); IP Multimedia Call Control Protocol based on Session
Initiation Protocol (SIP) and Session Description Protocol (SDP) Stage 3
[3GPP TS 24.229 (Release 7), modified]".
[4] ETSI ES 282 007: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); IP Multimedia Subsystem (IMS); Functional architecture".
[5] ETSI EN 300 356-3 (V4.2.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 3: Calling Line
Identification Presentation (CLIP) supplementary service [ITU-T Recommendation Q.731,
clause 3 (1993) modified]".
[6] ETSI EN 300 356-4 (V4.2.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 4: Calling Line
Identification Restriction (CLIR) supplementary service [ITU-T Recommendation Q.731,
clause 4 (1993) modified]".
[7] ETSI EN 300 356-5 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 5: Connected
Line Identification Presentation (COLP) supplementary service [ITU-T Recommendation Q.731,
clause 5 (1993) modified]".
[8] ETSI EN 300 356-6 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 6: Connected
Line Identification Restriction (COLR) supplementary service [ITU-T Recommendation Q.731,
clause 6 (1993) modified]".
[9] ETSI EN 300 356-7 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 7: Terminal
Portability (TP) supplementary service [ITU-T Recommendation Q.733, clause 4 (1993)
modified]".
[10] ETSI EN 300 356-8 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 8: User-to-User
Signalling (UUS) supplementary service [ITU-T Recommendation Q.737, clause 1 (1997)
modified]".
[11] ETSI EN 300 356-9 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 9: Closed User
Group (CUG) supplementary service [ITU-T Recommendation Q.735, clause 1 (1993) modified]".
[12] ETSI EN 300 356-10 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface;
Part 10: Subaddressing (SUB) supplementary service [ITU-T Recommendation Q.731, clause 8
(1992) modified]".
[13] ETSI EN 300 356-11 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 11: Malicious
Call Identification (MCID) supplementary service [ITU-T Recommendation Q.731, clause 7
(1997) modified]".
[14] ETSI EN 300 356-12 (V4.2.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 12: Conference
call, add-on (CONF) supplementary service [ITU-T Recommendation Q.734, clause 1 (1993) and
implementors guide (1998) modified]".
[15] ETSI EN 300 356-14 (V4.2.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 14: Explicit Call
Transfer (ECT) supplementary service [ITU-T Recommendation Q.732, clause 7 (1996) and
implementors guide (1998) modified]".
ETSI
7 Final draft ETSI ES 283 027 V2.4.0 (2008-01)
[16] ETSI EN 300 356-15 (V4.2.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 15: Diversion
supplementary service [ITU-T Recommendation Q.732, clauses 2 to 5 (1999) modified]".
[17] ETSI EN 300 356-16 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface;
Part 16: Call Hold (HOLD) supplementary service [ITU-T Recommendation Q.733,
clause 2 (1993) modified]".
[18] ETSI EN 300 356-17 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface;
Part 17: Call Waiting (CW) supplementary service [ITU-T Recommendation Q.733,
clause 1 (1992) modified]".
[19] ETSI EN 300 356-18 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 18: Completion
of Calls to Busy Subscriber (CCBS) supplementary service [ITU-T Recommendation Q.733,
clause 3 (1997) modified]".
[20] ETSI EN 300 356-19 (V4.2.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface;
Part 19: Three-Party (3PTY) supplementary service [ITU-T Recommendation Q.734,
clause 2 (1996) and implementors guide (1998) modified]".
[21] ETSI EN 300 356-20 (V4.3.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 20: Completion
of Calls on No Reply (CCNR) supplementary service [ITU-T Recommendation Q.733, clause 5
(1999) modified]".
[22] ETSI EN 300 356-21: "Integrated Services Digital Network (ISDN); Signalling System No.7
(SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 21: Anonymous Call
Rejection (ACR) supplementary service [ITU-T Recommendation Q.731, clause 4 (1993)]".
[23] ETSI EN 300 485 (V1.2.3): "Integrated Services Digital Network (ISDN); Definition and usage of
cause and location in Digital Subscriber Signalling System No. one (DSS1) and Signalling System
No. 7 (SS7) ISDN User Part (ISUP) [ITU-T Recommendation Q.850 (1998) with addendum
modified]".
[24] ETSI EN 300 403-1: "Integrated Services Digital Network (ISDN); Digital Subscriber Signalling
System No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control;
Part 1: Protocol specification [ITU-T Recommendation Q.931 (1993), modified]".
[25] IETF RFC 3966 (December 2004): "The tel URI for Telephone Numbers".
ETSI
8 Final draft ETSI ES 283 027 V2.4.0 (2008-01)
3 Definitions and abbreviations
For the purposes of the present document, the terms, definitions and abbreviations given in 3GPP TS 29.163 [1],
clauses 7.2.3 and 7.4 apply.
Endorsement notice
The present document endorses 3GPP TS 29.163: "3rd Generation Partnership Project; Technical Specification Group
Core Network and Terminals; Interworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit
Switched (CS) networks (Release 7)" [1], the contents of which apply together with the following modifications:
Clauses 6.3, 7.3, 8, 9.2.2.1, 9.2.2.2, 9.2.3.1, 9.2.3.2, 9.2.4.1, 9.2.5.1, 9.2.6.1, 9.2.7.1, 9.2.8.1, 9.2.8.3 and annex B do not
apply to this recommendation.
NOTE: Underlining and/or strike-out are used to highlight detailed modifications where necessary.
Global modifications to 3GPP TS 29.163 Release 7
Throughout the text of the 3GPP TS 29.163 Release 7
Replace references as shown in table 1.
Table 1
References in 3GPP TS 29.163 [1] Replaced references
ITU-T Recommendation Q.761 EN 300 356-1 [2]
ITU-T Recommendation Q.762 EN 300 356-1 [2]
ITU-T Recommendation Q.763 EN 300 356-1 [2]
ITU-T Recommendation Q.764 EN 300 356-1 [2]
3GPP TS 24.229 ES 283 003 [3]
3GPP TS 23.228 ES 282 007 [4]
ITU-T Recommendation Q.850 (1998) EN 300 485 [23]
ITU-T Recommendation Q.731.3 EN 300 356-3 [5]
ITU-T Recommendation Q.731.4 EN 300 356-4 [6]
ITU-T Recommendation Q.731.5 EN 300 356-5 [7]
ITU-T Recommendation Q.731.6 EN 300 356-6 [8]
ITU-T Recommendation Q.731.7 EN 300 356-11 [13]
ITU-T Recommendation Q.731.8 EN 300 356-10 [12]
ITU-T Recommendation Q.732.2 EN 300 356-15 [16]
ITU-T Recommendation Q.732.3 EN 300 356-15 [16]
ITU-T Recommendation Q.732.4 EN 300 356-15 [16]
ITU-T Recommendation Q.732.5 EN 300 356-15 [16]
ITU-T Recommendation Q.732.7 EN 300 356-14 [15]
ITU-T Recommendation Q.733.1 EN 300 356-17 [18]
ITU-T Recommendation Q.733.2 EN 300 356-16 [17]
ITU-T Recommendation Q.733.3 EN 300 356-18 [19]
ITU-T Recommendation Q.733.4 EN 300 356-7 [9]
ITU-T Recommendation Q.733.5 EN 300 356-20 [21]
ITU-T Recommendation Q.734.1 EN 300 356-12 [14]
ITU-T Recommendation Q.734.2 EN 300 356-19 [20]
ITU-T Recommendation Q.735.1 EN 300 356-9 [11]
ITU-T Recommendation Q.737.1 EN 300 356-8 [10]

ETSI
9 Final draft ETSI ES 283 027 V2.4.0 (2008-01)
Clause 2
Modify as follows:
[77] IETF draft-ietf-sip-acr-code-03 "Rejecting Anonymous Requests in the Session Initiation Protocol
(SIP)"
[77] IETF RFC 5079: "Rejecting Anonymous Requests in the Session Initiation Protocol (SIP)".
[89] draft-ejzak-sipping-p-em-auth-03.txt (January 2007): "Private Header (P-Header) Extension to the
Session Initiation Protocol (SIP) for Authorization of Early Media".
[89] IETF RFC 5009: "Private Header (P-Header) Extension to the Session Initiation Protocol (SIP) for
Authorization of Early Media".
[91] ETSI EN 300 403-1: "Integrated Services Digital Network (ISDN); Digital Subscriber Signalling
System No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control; Part
1: Protocol specification [ITU-T Recommendation Q.931 (1993), modified]".
[92] IETF RFC 3966: "The tel URI for Telephone Numbers".
[93] ISO/IEC 8348: "Information technology Open Systems Interconnection Network service
definition".
Clause 7.2.3.1.2.5 Transmission medium requirement
Modify as follows:
The I-MGCF may either transcode the selected codec(s) to the codec on the PSTN side or it may attempt to interwork
the media without transcoding. If the I-MGCF transcodes, it shall select the TMR parameter to "3,1 kHz audio". If the
I-MGCF does not transcode, it should map the TMR, USI and Access Transport parameters from the selected codec
according to table 2a. The support of any of the media listed in table 2a is optional. The SDP for the data transfer with
64 kbit/s clearmode shall be mapped to the TMR "64 kbit/s unrestricted".
If the XML BearerCapability element is received in the INVITE the mapping of the USI shall be taken from the
BearerCapability XML, else the USI shall be derived from the SDP attributes as shown in table2a.
Add clause 7.2.3.1.2.1.5a
7.2.3.1.2.5a Transmission medium requirement prime and USI prime (optional)
The Fallback mechanism shall only apply if a XML Bearer Capability element appears within the INVITE Request.
When the INVITE request includes multiple audio codecs with codec appearing in table 2a then the I-MGCF shall:
- If the first stated codec in the INVITE is a codec appearing in table 2a and is the equivalent as stated within the
second Bearer Capability in the XML Bearer Capability element then the I-MGCF shall map the XML Bearer
Capability element into the TMR and USI prime.
- If the second stated codec in the INVITE is a codec appearing in table 2a and is the equivalent as stated within
the first Bearer Capability in the XML Bearer Capability element then the I-MGCF shall map the XML Bearer
Capability element into the TMR prime and USI.
- If the compared codec stated within the INVITE is not equivalent as stated within XML Bearer Capability
element then the XML Bearer Capability element shall be discarded.
If the Fallback mechanism is not supported by the terminating network the procedures as described within
clause 7.2.3.1.2.5 shall apply.
In cases where the fallback appears within the terminating entity and sends back a codec to which is fallen back then the
I-MGCF shall only apply the cut-though to the chosen codec.
In cases where the fallback appears within the terminating entity and sends back a SDP Answer that is equivalent with
the TMR prime codec (fallback codec) then the I-MGCF shall only apply the cut-though to the fallback codec.

ETSI
10 Final draft ETSI ES 283 027 V2.4.0 (2008-01)
In cases where preconditions are used the I-MGCF has to wait for the SDP answer where the preconditions are met and
fallback codec is sent back.
Add clause 7.2.3.1.2.10
7.2.3.1.2.10 Access Transport Parameter and User Tele Service
When an INVITE was received containing a PSTN XML body as defined in ES 283 003 [3], an available
"ProgressIndicator" element can be as a network option mapped into a Progress Indicator in the Access Transport
Parameter of the sent IAM
Table 7a0.1: Mapping of PSTN XML elements with ISUP Parameters
INVITE  IAM
PSTN XML ISUP Parameter Content
ProgressIndicator ProgresAccess Transport Parameter s indicator
HighLayerCompatibility High layer compatibility (Note)
LowLayerCompatibility Low layer compatibility
BearerCapability User Service Information
HighLayerCompatibility User Tele Service High layer compatibility (Note)
NOTE: If two high layer compatibility information elements are received, they are transferred in the same order as
received in the INVITE message in the access transport parameter of the initial address message.

Clause 7.2.3.1.4 Sending of 180 ringing
Modify as follows:
The I-MGCF shall send the SIP 180 Ringing when receiving any of the following messages:
- ACM with Called party's status indicator set to subscriber free.

I-MGCF
ACM
180 Ringing
(Subscriber Free)
P-Early-Media (1)
Ring tone
NOTE: Including the P-Early-Media Header is a network option for a speech call.

Figure 6: The receipt of ACM
- CPG with Event indicator set to alerting
I-MGCF
180 Ringing
CPG (Alerting)
P-Early-Media (1)
Ring tone
NOTE: Including the P-Early-Media Header is a network option for a speech call.

Figure 7: Receipt of CPG (Alerting)
ETSI
11 Final draft ETSI ES 283 027 V2.4.0 (2008-01)
For a speech call, if the I-MGCF supports the P-Early-Media header as a network option, and if the INVITE request
includes the P-Early-Media header, the I-MGCF shall include in the SIP 180 ringing response a P-Early-Media header
authorizing early media, except when:
- the I-MGCF has already sent a reliable provisional response including a P-Early-Media header, as defined in
RFC5009 [89]; and
- the most recently sent P-Early-Media header authorized early media.
NOTE: If the I-MGCF signals the P-Early-Media header authorizing early media, then the IMS can expect tones
or announcements to the calling party to flow from the CS network via an MGW controlled by the
I-MGCF. In particular, once the I-MGCF sends the 180 Ringing response, ringback is expected in media
from the CS network.
Received PSTN XML elements shall be mapped as shown in table 7a0.2.
Table 7a0.2: ISUP Parameters with Mapping of PSTN XML elements
18x CPG or ACM
PSTN XML ISUP Parameter Content
ProgressIndicator ProgresAccess Transport Parameter s indicator
HighLayerCompatibility High layer compatibility (Note)
LowLayerCompatibility Low layer compatibility
NOTE: If two high layer compatibility information elements are received, they are transferred in the same order as
received in the INVITE message in the access transport parameter of the initial address message.

Table 7a0.3: Sending criteria of the XML with Progress indicator X
← 180 Ringing ←ACM
PSTN XML body with Progress indicator X Content
No. 1 Backward call indicators parameter
(Call is not end-to-end ISDN: further progress information may ISDN User Part indicator
be available in-band)  0 ISDN User Part not used all the way
No. 2 Backward call indicators parameter
(Destination address is non-ISDN) ISDN User Part indicator
1 ISDN User Part used all the way
ISDN access indicator
0 Terminating access non-ISDN
No. 4 Backward call indicators parameter
(Call is returned to ISDN)   ISDN User Part indicator
1 ISDN User Part used all the way
ISDN access indicator
1 Terminating access ISDN
Progress indicator
Progress indicator information elements possibly present in the access transport parameter of the Address Complete
Message (ACM) are transferred into the PSTN XML body (as defined in ES 283 003 [3]) of the 180 Ringing sent to the
calling user.
Clause 7.2.3.1.4A Sending of 183 Session Progress for early media scenarios
Modify as follows:
If SIP preconditions are used, the first 183 Session Progress will be sent after the reception of the INVITE request,
before any ISUP message has been received from the CS network. The I-MGCF shall not include the P-Early-Media
header in any SIP message before it receives an ISUP ACM.
On receipt of an ACM with the options described in table 7a2 the I-MGCF can be sent, as a network option, a
183 Session Progress response with following options:
ETSI
12 Final draft ETSI ES 283 027 V2.4.0 (2008-01)
Table 7a2: Sending criteria of the XML with Progress indicator X
← 183 Session Progress ←ACM
PSTN XML body with Progress indicator X Content
No. 1 Backward call indicators parameter
(Call is not end-to-end ISDN: further progress information ISDN User Part indicator
may be available in-band)  0 ISDN User Part not used all the way
No. 2 Backward call indicators parameter
(Destination address is non-ISDN) ISDN User Part indicator
1 ISDN User Part used all the way
ISDN access indicator
0 Terminating access non-ISDN
No. 4 Backward call indicators parameter
(Call is returned to ISDN)   ISDN User Part indicator
1 ISDN User Part used all the way
ISDN access indicator
1 Terminating access ISDN
Progress indicator
Progress indicator information elements possibly present in the access transport parameter of the Address Complete
Message (ACM) are transferred into the PSTN XML body (as defined in ES 283 003 [3]) of the 183 Session Progress
sent to the calling user.
For a speech call upon receipt of one of the following messages, if the I-MGCF supports the P-Early-Media header as a
network option, and if the I-MGCF has received the P-Early-Media header in the INVITE request, and has not already
sent a provisional response including a P-Early-Media header with parameters indicating authorization of early media,
then the I-MGCF shall send the 183 Session Progress response with a P-Early-Media header authorizing early media:
- ACM with the value of the called party's status indicator "no indication" and one of the options described in
table 7a1. Based on local configuration, the I-MGCF may also send a 183 Session Progress response with a
P-Early-Media header authorizing early media if it receives an ACM with other parameters than described in
table 7a1.
I-MGCF
ACM
183 Progress
(No indication)
P-Early-Media
appropriate announcement
Figure 7c: Receipt of ACM "No indication"
Table 7a.1: ACM Parameters that trigger the 183 Session Progress response
←183 Session Progress ←ACM
1 ）Optional backward call indicators parameter
183 Session Progress response including a P-Early-Media
In-band information indicator
header authorizing early media, if not already sent
1 In-band info.
2 ）Backward call indicators parameter
ISDN User Part indicator
0 ISDN User Part not used all the way

NOTE: As a network option the I-MGCF can also map ACM into 183 in other cases than those described in
table 7a1.
ETSI
13 Final draft ETSI ES 283 027 V2.4.0 (2008-01)
- CPG message, when:
1. Event indicator is set to "in-band information or an appropriate pattern is now available"; or
2. Event indicator is set to "Progress" and one of the options described in table 7b1.

I-MGCF
CPG
183 Progress
(in-band information available)
P-Early-Media
appropriate announcment
Figure 7d: Receipt of CPG (in-band information available)
Table 7b.1: CPG Parameters that trigger the 183 Session Progress response
←183 Session Progress ←CPG
Event indicator
183 Session Progress response including a P-Early- 000 0010 (progress)
Media header authorizing early media, if not already
1 ）Optional backward call indicators parameter
sent
In-band information indicator
0 In-band info .
2 ）Backward call indicators parameter
ISDN User Part indicator
0 ISDN User Part not used all the way
NOTE 1: The mapping of the contents in the CPG message is only relevant if the information received in the
message is different compared to earlier received information, e.g. in the ACM message or a CPG
message received prior to this message.
NOTE 2: 183 Session Progress message including a P-Early-Media header authorizing early media may only be
sent for a speech call.
NOTE: As a network option the I-MGCF can also map CPG into 183 in other cases than those described in
table 7a1.
Received PSTN XML elements shall be mapped as shown in table 7a0.2
On receipt of an CPG with the options described in table 7a3 the I-MGCF can be sent, as a network option, 183 Session
Progress response with following options:
Table 7a3 : Sending criteria of the XML with Progress indicator X
← 183 Session Progress ←CPG
PSTN XML body with Progress indicator X Content
No. 1 Backward call indicators parameter
(Call is not end-to-end ISDN: further progress information may
ISDN User Part indicator
be available in-band)  0 ISDN User Part not used all the way
No. 2 Backward call indicators parameter
(Destination address is non-ISDN) ISDN User Part indicator
1 ISDN User Part used all the way
ISDN access indicator
0 Terminating access non-ISDN
No. 4 Backward call indicators parameter
(Call is returned to ISDN)   ISDN User Part indicator
1 ISDN User Part used all the way
ISDN access indicator
1 Terminating access ISDN
ETSI
14 Final draft ETSI ES 283 027 V2.4.0 (2008-01)
Progress indicator
Progress indicator information elements possibly present in the access transport parameter of the Call Progress Message
(CPG) are transferred into the PSTN XML (as defined in ES 283 003 [3]) body of the 183 Session Progress to the
calling use
...

ETSI Standard
Telecommunications and Internet converged Services and
Protocols for Advanced Networking (TISPAN);
Endorsement of the SIP-ISUP Interworking between the
IP Multimedia (IM) Core Network (CN) subsystem
and Circuit Switched (CS) networks
[3GPP TS 29.163 (Release 7), modified]

2 ETSI ES 283 027 V2.4.0 (2008-04)

Reference
RES/TISPAN-03119-NGN-R2
Keywords
endorsement, interworking, ISUP, SIP
ETSI
650 Route des Lucioles
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ETSI
3 ETSI ES 283 027 V2.4.0 (2008-04)
Contents
Intellectual Property Rights.4
Foreword.4
1 Scope.5
2 References.5
2.1 Normative references.5
2.2 Informative references.7
3 Definitions and abbreviations.7
Endorsement notice .8
Global modifications to 3GPP TS 29.163 Release 7.8
Annex A (informative): Change history .26
History .27

ETSI
4 ETSI ES 283 027 V2.4.0 (2008-04)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://webapp.etsi.org/IPR/home.asp).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This ETSI Standard (ES) has been produced by ETSI Technical Committee Telecommunications and Internet
converged Services and Protocols for Advanced Networking (TISPAN).
ETSI
5 ETSI ES 283 027 V2.4.0 (2008-04)
1 Scope
The present document provides the ETSI endorsement of the 3GPP TS 29.163 [1].
Clauses 7.2.3 and 7.4 of 3GPP TS 29.163 [1] specify the signalling interworking between ISDN User Part (ISUP)
protocols and SIP in order to support services that can be commonly supported by ISUP and SIP-based network
domains.
Clause 9.2.3.3.5 specifies how ringing tone is applied at the gateway when interworking ISUP and SIP.
The present document specifies the principles of interworking between the ETSI TISPAN IMS and ISUP based legacy
CS networks, in order to support IM basic voice calls, therefore all the references to interworking between IMS and
BICC are out of scope of the present document.
The present document is a protocol interworking specification; therefore all references to the user plane interworking
are out of scope of the present document.
The present document specifies the interworking between ETSI SIP profile (as specified within ES 283 003 [3]) and
ISUP, as specified in EN 300 356-1 [2] respectively.
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• Non-specific reference may be made only to a complete document or a part thereof and only in the following
cases:
- if it is accepted that it will be possible to use all future changes of the referenced document for the
purposes of the referring document;
- for informative references.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
For online referenced documents, information sufficient to identify and locate the source shall be provided. Preferably,
the primary source of the referenced document should be cited, in order to ensure traceability. Furthermore, the
reference should, as far as possible, remain valid for the expected life of the document. The reference shall include the
method of access to the referenced document and the full network address, with the same punctuation and use of upper
case and lower case letters.
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
2.1 Normative references
The following referenced documents are indispensable for the application of the present document. For dated
references, only the edition cited applies. For non-specific references, the latest edition of the referenced document
(including any amendments) applies.
[1] 3GPP TS 29.163: "3rd Generation Partnership Project; Technical Specification Group Core
Network and Terminals; Interworking between the IP Multimedia (IM) Core Network (CN)
subsystem and Circuit Switched (CS) networks (Release 7)".
[2] ETSI EN 300 356-1 (V4.2.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 1: Basic services
[ITU-T Recommendations Q.761 to Q.764 (1999) modified]".
ETSI
6 ETSI ES 283 027 V2.4.0 (2008-04)
[3] ETSI ES 283 003: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); IP Multimedia Call Control Protocol based on Session
Initiation Protocol (SIP) and Session Description Protocol (SDP) Stage 3
[3GPP TS 24.229 (Release 7), modified]".
[4] ETSI ES 282 007: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); IP Multimedia Subsystem (IMS); Functional architecture".
[5] ETSI EN 300 356-3 (V4.2.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 3: Calling Line
Identification Presentation (CLIP) supplementary service [ITU-T Recommendation Q.731,
clause 3 (1993) modified]".
[6] ETSI EN 300 356-4 (V4.2.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 4: Calling Line
Identification Restriction (CLIR) supplementary service [ITU-T Recommendation Q.731,
clause 4 (1993) modified]".
[7] ETSI EN 300 356-5 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 5: Connected
Line Identification Presentation (COLP) supplementary service [ITU-T Recommendation Q.731,
clause 5 (1993) modified]".
[8] ETSI EN 300 356-6 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 6: Connected
Line Identification Restriction (COLR) supplementary service [ITU-T Recommendation Q.731,
clause 6 (1993) modified]".
[9] ETSI EN 300 356-7 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 7: Terminal
Portability (TP) supplementary service [ITU-T Recommendation Q.733, clause 4 (1993)
modified]".
[10] ETSI EN 300 356-8 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 8: User-to-User
Signalling (UUS) supplementary service [ITU-T Recommendation Q.737, clause 1 (1997)
modified]".
[11] ETSI EN 300 356-9 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 9: Closed User
Group (CUG) supplementary service [ITU-T Recommendation Q.735, clause 1 (1993) modified]".
[12] ETSI EN 300 356-10 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface;
Part 10: Subaddressing (SUB) supplementary service [ITU-T Recommendation Q.731, clause 8
(1992) modified]".
[13] ETSI EN 300 356-11 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 11: Malicious
Call Identification (MCID) supplementary service [ITU-T Recommendation Q.731, clause 7
(1997) modified]".
[14] ETSI EN 300 356-12 (V4.2.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 12: Conference
call, add-on (CONF) supplementary service [ITU-T Recommendation Q.734, clause 1 (1993) and
implementors guide (1998) modified]".
[15] ETSI EN 300 356-14 (V4.2.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 14: Explicit Call
Transfer (ECT) supplementary service [ITU-T Recommendation Q.732, clause 7 (1996) and
implementors guide (1998) modified]".
ETSI
7 ETSI ES 283 027 V2.4.0 (2008-04)
[16] ETSI EN 300 356-15 (V4.2.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 15: Diversion
supplementary service [ITU-T Recommendation Q.732, clauses 2 to 5 (1999) modified]".
[17] ETSI EN 300 356-16 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface;
Part 16: Call Hold (HOLD) supplementary service [ITU-T Recommendation Q.733,
clause 2 (1993) modified]".
[18] ETSI EN 300 356-17 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface;
Part 17: Call Waiting (CW) supplementary service [ITU-T Recommendation Q.733,
clause 1 (1992) modified]".
[19] ETSI EN 300 356-18 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 18: Completion
of Calls to Busy Subscriber (CCBS) supplementary service [ITU-T Recommendation Q.733,
clause 3 (1997) modified]".
[20] ETSI EN 300 356-19 (V4.2.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface;
Part 19: Three-Party (3PTY) supplementary service [ITU-T Recommendation Q.734,
clause 2 (1996) and implementors guide (1998) modified]".
[21] ETSI EN 300 356-20 (V4.3.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 20: Completion
of Calls on No Reply (CCNR) supplementary service [ITU-T Recommendation Q.733, clause 5
(1999) modified]".
[22] ETSI EN 300 356-21: "Integrated Services Digital Network (ISDN); Signalling System No.7
(SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 21: Anonymous Call
Rejection (ACR) supplementary service [ITU-T Recommendation Q.731, clause 4 (1993)]".
[23] ETSI EN 300 485 (V1.2.3): "Integrated Services Digital Network (ISDN); Definition and usage of
cause and location in Digital Subscriber Signalling System No. one (DSS1) and Signalling System
No. 7 (SS7) ISDN User Part (ISUP) [ITU-T Recommendation Q.850 (1998) with addendum
modified]".
[24] ETSI EN 300 403-1: "Integrated Services Digital Network (ISDN); Digital Subscriber Signalling
System No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control;
Part 1: Protocol specification [ITU-T Recommendation Q.931 (1993), modified]".
[25] IETF RFC 3966 (December 2004): "The tel URI for Telephone Numbers".
2.2 Informative references
Not applicable.
3 Definitions and abbreviations
For the purposes of the present document, the terms, definitions and abbreviations given in 3GPP TS 29.163 [1],
clauses 7.2.3 and 7.4 apply.
ETSI
8 ETSI ES 283 027 V2.4.0 (2008-04)
Endorsement notice
The present document endorses 3GPP TS 29.163: "3rd Generation Partnership Project; Technical Specification Group
Core Network and Terminals; Interworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit
Switched (CS) networks (Release 7)" [1], the contents of which apply together with the following modifications:
Clauses 6.3, 7.3, 8, 9.2.2.1, 9.2.2.2, 9.2.3.1, 9.2.3.2, 9.2.4.1, 9.2.5.1, 9.2.6.1, 9.2.7.1, 9.2.8.1, 9.2.8.3 and annex B do not
apply to this recommendation.
NOTE: Underlining and/or strike-out are used to highlight detailed modifications where necessary.
Global modifications to 3GPP TS 29.163 Release 7
Throughout the text of the 3GPP TS 29.163 Release 7
Replace references as shown in table 1.
Table 1
References in 3GPP TS 29.163 [1] Replaced references
ITU-T Recommendation Q.761 EN 300 356-1 [2]
ITU-T Recommendation Q.762 EN 300 356-1 [2]
ITU-T Recommendation Q.763 EN 300 356-1 [2]
ITU-T Recommendation Q.764 EN 300 356-1 [2]
3GPP TS 24.229 ES 283 003 [3]
3GPP TS 23.228 ES 282 007 [4]
ITU-T Recommendation Q.850 (1998) EN 300 485 [23]
ITU-T Recommendation Q.731.3 EN 300 356-3 [5]
ITU-T Recommendation Q.731.4 EN 300 356-4 [6]
ITU-T Recommendation Q.731.5 EN 300 356-5 [7]
ITU-T Recommendation Q.731.6 EN 300 356-6 [8]
ITU-T Recommendation Q.731.7 EN 300 356-11 [13]
ITU-T Recommendation Q.731.8 EN 300 356-10 [12]
ITU-T Recommendation Q.732.2 EN 300 356-15 [16]
ITU-T Recommendation Q.732.3 EN 300 356-15 [16]
ITU-T Recommendation Q.732.4 EN 300 356-15 [16]
ITU-T Recommendation Q.732.5 EN 300 356-15 [16]
ITU-T Recommendation Q.732.7 EN 300 356-14 [15]
ITU-T Recommendation Q.733.1 EN 300 356-17 [18]
ITU-T Recommendation Q.733.2 EN 300 356-16 [17]
ITU-T Recommendation Q.733.3 EN 300 356-18 [19]
ITU-T Recommendation Q.733.4 EN 300 356-7 [9]
ITU-T Recommendation Q.733.5 EN 300 356-20 [21]
ITU-T Recommendation Q.734.1 EN 300 356-12 [14]
ITU-T Recommendation Q.734.2 EN 300 356-19 [20]
ITU-T Recommendation Q.735.1 EN 300 356-9 [11]
ITU-T Recommendation Q.737.1 EN 300 356-8 [10]

ETSI
9 ETSI ES 283 027 V2.4.0 (2008-04)
Clause 2
Modify as follows:
[77] IETF draft-ietf-sip-acr-code-03 "Rejecting Anonymous Requests in the Session Initiation Protocol
(SIP)"
[77] IETF RFC 5079: "Rejecting Anonymous Requests in the Session Initiation Protocol (SIP)".
[89] draft-ejzak-sipping-p-em-auth-03.txt (January 2007): "Private Header (P-Header) Extension to the
Session Initiation Protocol (SIP) for Authorization of Early Media".
[89] IETF RFC 5009: "Private Header (P-Header) Extension to the Session Initiation Protocol (SIP) for
Authorization of Early Media".
[91] ETSI EN 300 403-1: "Integrated Services Digital Network (ISDN); Digital Subscriber Signalling
System No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control; Part
1: Protocol specification [ITU-T Recommendation Q.931 (1993), modified]".
[92] IETF RFC 3966: "The tel URI for Telephone Numbers".
[93] ISO/IEC 8348: "Information technology Open Systems Interconnection Network service
definition".
Clause 7.2.3.1.2.5 Transmission medium requirement
Modify as follows:
The I-MGCF may either transcode the selected codec(s) to the codec on the PSTN side or it may attempt to interwork
the media without transcoding. If the I-MGCF transcodes, it shall select the TMR parameter to "3,1 kHz audio". If the
I-MGCF does not transcode, it should map the TMR, USI and Access Transport parameters from the selected codec
according to table 2a. The support of any of the media listed in table 2a is optional. The SDP for the data transfer with
64 kbit/s clearmode shall be mapped to the TMR "64 kbit/s unrestricted".
If the XML BearerCapability element is received in the INVITE the mapping of the USI shall be taken from the
BearerCapability XML, else the USI shall be derived from the SDP attributes as shown in table2a.
Add clause 7.2.3.1.2.1.5a
7.2.3.1.2.5a Transmission medium requirement prime and USI prime (optional)
The Fallback mechanism shall only apply if a XML Bearer Capability element appears within the INVITE Request.
When the INVITE request includes multiple audio codecs with codec appearing in table 2a then the I-MGCF shall:
- If the first stated codec in the INVITE is a codec appearing in table 2a and is the equivalent as stated within the
second Bearer Capability in the XML Bearer Capability element then the I-MGCF shall map the XML Bearer
Capability element into the TMR and USI prime.
- If the second stated codec in the INVITE is a codec appearing in table 2a and is the equivalent as stated within
the first Bearer Capability in the XML Bearer Capability element then the I-MGCF shall map the XML Bearer
Capability element into the TMR prime and USI.
- If the compared codec stated within the INVITE is not equivalent as stated within XML Bearer Capability
element then the XML Bearer Capability element shall be discarded.
If the Fallback mechanism is not supported by the terminating network the procedures as described within
clause 7.2.3.1.2.5 shall apply.
In cases where the fallback appears within the terminating entity and sends back a codec to which is fallen back then the
I-MGCF shall only apply the cut-though to the chosen codec.
In cases where the fallback appears within the terminating entity and sends back a SDP Answer that is equivalent with
the TMR prime codec (fallback codec) then the I-MGCF shall only apply the cut-though to the fallback codec.
ETSI
10 ETSI ES 283 027 V2.4.0 (2008-04)
In cases where preconditions are used the I-MGCF has to wait for the SDP answer where the preconditions are met and
fallback codec is sent back.
Add clause 7.2.3.1.2.10
7.2.3.1.2.10 Access Transport Parameter and User Tele Service
When an INVITE was received containing a PSTN XML body as defined in ES 283 003 [3], an available
"ProgressIndicator" element can be as a network option mapped into a Progress Indicator in the Access Transport
Parameter of the sent IAM
Table 7a0.1: Mapping of PSTN XML elements with ISUP Parameters
INVITE  IAM
PSTN XML ISUP Parameter Content
ProgressIndicator ProgresAccess Transport Parameter s indicator
HighLayerCompatibility High layer compatibility (Note)
LowLayerCompatibility Low layer compatibility
BearerCapability User Service Information
HighLayerCompatibility User Tele Service High layer compatibility (Note)
NOTE: If two high layer compatibility information elements are received, they are transferred in the same order as
received in the INVITE message in the access transport parameter of the initial address message.

Clause 7.2.3.1.4 Sending of 180 ringing
Modify as follows:
The I-MGCF shall send the SIP 180 Ringing when receiving any of the following messages:
- ACM with Called party's status indicator set to subscriber free.

I-MGCF
ACM
180 Ringing
(Subscriber Free)
P-Early-Media (1)
Ring tone
NOTE: Including the P-Early-Media Header is a network option for a speech call.

Figure 6: The receipt of ACM
- CPG with Event indicator set to alerting
I-MGCF
180 Ringing
CPG (Alerting)
P-Early-Media (1)
Ring tone
NOTE: Including the P-Early-Media Header is a network option for a speech call.

Figure 7: Receipt of CPG (Alerting)
ETSI
11 ETSI ES 283 027 V2.4.0 (2008-04)
For a speech call, if the I-MGCF supports the P-Early-Media header as a network option, and if the INVITE request
includes the P-Early-Media header, the I-MGCF shall include in the SIP 180 ringing response a P-Early-Media header
authorizing early media, except when:
- the I-MGCF has already sent a reliable provisional response including a P-Early-Media header, as defined in
RFC5009 [89]; and
- the most recently sent P-Early-Media header authorized early media.
NOTE: If the I-MGCF signals the P-Early-Media header authorizing early media, then the IMS can expect tones
or announcements to the calling party to flow from the CS network via an MGW controlled by the
I-MGCF. In particular, once the I-MGCF sends the 180 Ringing response, ringback is expected in media
from the CS network.
Received PSTN XML elements shall be mapped as shown in table 7a0.2.
Table 7a0.2: ISUP Parameters with Mapping of PSTN XML elements
18x CPG or ACM
PSTN XML ISUP Parameter Content
ProgressIndicator ProgresAccess Transport Parameter s indicator
HighLayerCompatibility High layer compatibility (Note)
LowLayerCompatibility Low layer compatibility
NOTE: If two high layer compatibility information elements are received, they are transferred in the same order as
received in the INVITE message in the access transport parameter of the initial address message.

Table 7a0.3: Sending criteria of the XML with Progress indicator X
← 180 Ringing ←ACM
PSTN XML body with Progress indicator X Content
No. 1 Backward call indicators parameter
(Call is not end-to-end ISDN: further progress information may ISDN User Part indicator
be available in-band)  0 ISDN User Part not used all the way
No. 2 Backward call indicators parameter
(Destination address is non-ISDN) ISDN User Part indicator
1 ISDN User Part used all the way
ISDN access indicator
0 Terminating access non-ISDN
No. 4 Backward call indicators parameter
(Call is returned to ISDN)   ISDN User Part indicator
1 ISDN User Part used all the way
ISDN access indicator
1 Terminating access ISDN
Progress indicator
Progress indicator information elements possibly present in the access transport parameter of the Address Complete
Message (ACM) are transferred into the PSTN XML body (as defined in ES 283 003 [3]) of the 180 Ringing sent to the
calling user.
Clause 7.2.3.1.4A Sending of 183 Session Progress for early media scenarios
Modify as follows:
If SIP preconditions are used, the first 183 Session Progress will be sent after the reception of the INVITE request,
before any ISUP message has been received from the CS network. The I-MGCF shall not include the P-Early-Media
header in any SIP message before it receives an ISUP ACM.
ETSI
12 ETSI ES 283 027 V2.4.0 (2008-04)
On receipt of an ACM with the options described in table 7a2 the I-MGCF can be sent, as a network option, a
183 Session Progress response with following options:
Table 7a2: Sending criteria of the XML with Progress indicator X
← 183 Session Progress ←ACM
PSTN XML body with Progress indicator X Content
No. 1 Backward call indicators parameter
(Call is not end-to-end ISDN: further progress information ISDN User Part indicator
may be available in-band)  0 ISDN User Part not used all the way
No. 2 Backward call indicators parameter
(Destination address is non-ISDN) ISDN User Part indicator
1 ISDN User Part used all the way
ISDN access indicator
0 Terminating access non-ISDN
No. 4 Backward call indicators parameter
(Call is returned to ISDN)   ISDN User Part indicator
1 ISDN User Part used all the way
ISDN access indicator
1 Terminating access ISDN
Progress indicator
Progress indicator information elements possibly present in the access transport parameter of the Address Complete
Message (ACM) are transferred into the PSTN XML body (as defined in ES 283 003 [3]) of the 183 Session Progress
sent to the calling user.
For a speech call upon receipt of one of the following messages, if the I-MGCF supports the P-Early-Media header as a
network option, and if the I-MGCF has received the P-Early-Media header in the INVITE request, and has not already
sent a provisional response including a P-Early-Media header with parameters indicating authorization of early media,
then the I-MGCF shall send the 183 Session Progress response with a P-Early-Media header authorizing early media:
- ACM with the value of the called party's status indicator "no indication" and one of the options described in
table 7a1. Based on local configuration, the I-MGCF may also send a 183 Session Progress response with a
P-Early-Media header authorizing early media if it receives an ACM with other parameters than described in
table 7a1.
I-MGCF
ACM
183 Progress
(No indication)
P-Early-Media
appropriate announcement
Figure 7c: Receipt of ACM "No indication"
Table 7a.1: ACM Parameters that trigger the 183 Session Progress response
←183 Session Progress ←ACM
1 ）Optional backward call indicators parameter
183 Session Progress response including a P-Early-Media
In-band information indicator
header authorizing early media, if not already sent
1 In-band info.
2 ）Backward call indicators parameter
ISDN User Part indicator
0 ISDN User Part not used all the way

NOTE: As a network option the I-MGCF can also map ACM into 183 in other cases than those described in
table 7a1.
ETSI
13 ETSI ES 283 027 V2.4.0 (2008-04)
- CPG message, when:
1. Event indicator is set to "in-band information or an appropriate pattern is now available"; or
2. Event indicator is set to "Progress" and one of the options described in table 7b1.

I-MGCF
CPG
183 Progress
(in-band information available)
P-Early-Media
appropriate announcment
Figure 7d: Receipt of CPG (in-band information available)
Table 7b.1: CPG Parameters that trigger the 183 Session Progress response
←183 Session Progress ←CPG
Event indicator
183 Session Progress response including a P-Early- 000 0010 (progress)
Media header authorizing early media, if not already
1 ）Optional backward call indicators parameter
sent
In-band information indicator
0 In-band info .
2 ）Backward call indicators parameter
ISDN User Part indicator
0 ISDN User Part not used all the way
NOTE 1: The mapping of the contents in the CPG message is only relevant if the information received in the
message is different compared to earlier received information, e.g. in the ACM message or a CPG
message received prior to this message.
NOTE 2: 183 Session Progress message including a P-Early-Media header authorizing early media may only be
sent for a speech call.
NOTE: As a network option the I-MGCF can also map CPG into 183 in other cases than those described in
table 7a1.
Received PSTN XML elements shall be mapped as shown in table 7a0.2
On receipt of an CPG with the options described in table 7a3 the I-MGCF can be sent, as a network option, 183 Session
Progress response with following options:
Table 7a3 : Sending criteria of the XML with Progress indicator X
← 183 Session Progress ←CPG
PSTN XML body with Progress indicator X Content
No. 1 Backward call indicators parameter
(Call is not end-to-end ISDN: further progress information may
ISDN User Part indicator
be available in-band)  0 ISDN User Part not used all the way
No. 2 Backward call indicators parameter
(Destination address is non-ISDN) ISDN User Part indicator
1 ISDN User Part used all the way
ISDN access indicator
0 Terminating access non-ISDN
No. 4 Backward call indicators parameter
(Call is returned to ISDN)   ISDN User Part indicator
1 ISDN User Part used all the way
ISDN access indicator
1 Terminating access ISDN
ETSI
14 ETSI ES 283 027 V2.4.0 (2008-04)
Progress indicator
Progress indicator information elements possibly present in the access transport parameter of the Call Progress Message
(CPG) are transferred into the PSTN XML (as defined in ES 283 003 [3]) body
...

SLOVENSKI STANDARD
01-julij-2008
=OLWHWHOHNRPXQLNDFLMVNHLQLQWHUQHWQHVWRULWYHWHUSURWRNROL]DQDSUHGQRRPUHåHQMH
7,63$13RWUGLWHYPHGVHERMQHJDGHORYDQMD6,3,683PHGSRGVLVWHPRP,3
YHþSUHGVWDYQRVWQHJDMHGUQHJDRPUHåMD&1LQYRGRYQRNRPXWLUDQLPL&6
RPUHåML
Telecommunications and Internet converged Services and Protocols for Advanced
Networking (TISPAN) - Endorsement of the SIP-ISUP Interworking between the IP
Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networks
Ta slovenski standard je istoveten z: ES 283 027 Version 2.4.0
ICS:
33.040.01 Telekomunikacijski sistemi Telecommunication systems
na splošno in general
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

ETSI Standard
Telecommunications and Internet converged Services and
Protocols for Advanced Networking (TISPAN);
Endorsement of the SIP-ISUP Interworking between the
IP Multimedia (IM) Core Network (CN) subsystem
and Circuit Switched (CS) networks
[3GPP TS 29.163 (Release 7), modified]

2 ETSI ES 283 027 V2.4.0 (2008-04)

Reference
RES/TISPAN-03119-NGN-R2
Keywords
endorsement, interworking, ISUP, SIP
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: [phone]  Fax: [phone]

Siret N° 348 623 562 00017 - NAF 742 C
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Sous-Préfecture de Grasse (06) N° 7803/88

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ETSI
3 ETSI ES 283 027 V2.4.0 (2008-04)
Contents
Intellectual Property Rights.4
Foreword.4
1 Scope.5
2 References.5
2.1 Normative references.5
2.2 Informative references.7
3 Definitions and abbreviations.7
Endorsement notice .8
Global modifications to 3GPP TS 29.163 Release 7.8
Annex A (informative): Change history .26
History .27

ETSI
4 ETSI ES 283 027 V2.4.0 (2008-04)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://webapp.etsi.org/IPR/home.asp).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This ETSI Standard (ES) has been produced by ETSI Technical Committee Telecommunications and Internet
converged Services and Protocols for Advanced Networking (TISPAN).
ETSI
5 ETSI ES 283 027 V2.4.0 (2008-04)
1 Scope
The present document provides the ETSI endorsement of the 3GPP TS 29.163 [1].
Clauses 7.2.3 and 7.4 of 3GPP TS 29.163 [1] specify the signalling interworking between ISDN User Part (ISUP)
protocols and SIP in order to support services that can be commonly supported by ISUP and SIP-based network
domains.
Clause 9.2.3.3.5 specifies how ringing tone is applied at the gateway when interworking ISUP and SIP.
The present document specifies the principles of interworking between the ETSI TISPAN IMS and ISUP based legacy
CS networks, in order to support IM basic voice calls, therefore all the references to interworking between IMS and
BICC are out of scope of the present document.
The present document is a protocol interworking specification; therefore all references to the user plane interworking
are out of scope of the present document.
The present document specifies the interworking between ETSI SIP profile (as specified within ES 283 003 [3]) and
ISUP, as specified in EN 300 356-1 [2] respectively.
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• Non-specific reference may be made only to a complete document or a part thereof and only in the following
cases:
- if it is accepted that it will be possible to use all future changes of the referenced document for the
purposes of the referring document;
- for informative references.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
For online referenced documents, information sufficient to identify and locate the source shall be provided. Preferably,
the primary source of the referenced document should be cited, in order to ensure traceability. Furthermore, the
reference should, as far as possible, remain valid for the expected life of the document. The reference shall include the
method of access to the referenced document and the full network address, with the same punctuation and use of upper
case and lower case letters.
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
2.1 Normative references
The following referenced documents are indispensable for the application of the present document. For dated
references, only the edition cited applies. For non-specific references, the latest edition of the referenced document
(including any amendments) applies.
[1] 3GPP TS 29.163: "3rd Generation Partnership Project; Technical Specification Group Core
Network and Terminals; Interworking between the IP Multimedia (IM) Core Network (CN)
subsystem and Circuit Switched (CS) networks (Release 7)".
[2] ETSI EN 300 356-1 (V4.2.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 1: Basic services
[ITU-T Recommendations Q.761 to Q.764 (1999) modified]".
ETSI
6 ETSI ES 283 027 V2.4.0 (2008-04)
[3] ETSI ES 283 003: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); IP Multimedia Call Control Protocol based on Session
Initiation Protocol (SIP) and Session Description Protocol (SDP) Stage 3
[3GPP TS 24.229 (Release 7), modified]".
[4] ETSI ES 282 007: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); IP Multimedia Subsystem (IMS); Functional architecture".
[5] ETSI EN 300 356-3 (V4.2.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 3: Calling Line
Identification Presentation (CLIP) supplementary service [ITU-T Recommendation Q.731,
clause 3 (1993) modified]".
[6] ETSI EN 300 356-4 (V4.2.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 4: Calling Line
Identification Restriction (CLIR) supplementary service [ITU-T Recommendation Q.731,
clause 4 (1993) modified]".
[7] ETSI EN 300 356-5 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 5: Connected
Line Identification Presentation (COLP) supplementary service [ITU-T Recommendation Q.731,
clause 5 (1993) modified]".
[8] ETSI EN 300 356-6 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 6: Connected
Line Identification Restriction (COLR) supplementary service [ITU-T Recommendation Q.731,
clause 6 (1993) modified]".
[9] ETSI EN 300 356-7 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 7: Terminal
Portability (TP) supplementary service [ITU-T Recommendation Q.733, clause 4 (1993)
modified]".
[10] ETSI EN 300 356-8 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 8: User-to-User
Signalling (UUS) supplementary service [ITU-T Recommendation Q.737, clause 1 (1997)
modified]".
[11] ETSI EN 300 356-9 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 9: Closed User
Group (CUG) supplementary service [ITU-T Recommendation Q.735, clause 1 (1993) modified]".
[12] ETSI EN 300 356-10 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface;
Part 10: Subaddressing (SUB) supplementary service [ITU-T Recommendation Q.731, clause 8
(1992) modified]".
[13] ETSI EN 300 356-11 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 11: Malicious
Call Identification (MCID) supplementary service [ITU-T Recommendation Q.731, clause 7
(1997) modified]".
[14] ETSI EN 300 356-12 (V4.2.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 12: Conference
call, add-on (CONF) supplementary service [ITU-T Recommendation Q.734, clause 1 (1993) and
implementors guide (1998) modified]".
[15] ETSI EN 300 356-14 (V4.2.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 14: Explicit Call
Transfer (ECT) supplementary service [ITU-T Recommendation Q.732, clause 7 (1996) and
implementors guide (1998) modified]".
ETSI
7 ETSI ES 283 027 V2.4.0 (2008-04)
[16] ETSI EN 300 356-15 (V4.2.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 15: Diversion
supplementary service [ITU-T Recommendation Q.732, clauses 2 to 5 (1999) modified]".
[17] ETSI EN 300 356-16 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface;
Part 16: Call Hold (HOLD) supplementary service [ITU-T Recommendation Q.733,
clause 2 (1993) modified]".
[18] ETSI EN 300 356-17 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface;
Part 17: Call Waiting (CW) supplementary service [ITU-T Recommendation Q.733,
clause 1 (1992) modified]".
[19] ETSI EN 300 356-18 (V4.1.2): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 18: Completion
of Calls to Busy Subscriber (CCBS) supplementary service [ITU-T Recommendation Q.733,
clause 3 (1997) modified]".
[20] ETSI EN 300 356-19 (V4.2.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface;
Part 19: Three-Party (3PTY) supplementary service [ITU-T Recommendation Q.734,
clause 2 (1996) and implementors guide (1998) modified]".
[21] ETSI EN 300 356-20 (V4.3.1): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 20: Completion
of Calls on No Reply (CCNR) supplementary service [ITU-T Recommendation Q.733, clause 5
(1999) modified]".
[22] ETSI EN 300 356-21: "Integrated Services Digital Network (ISDN); Signalling System No.7
(SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 21: Anonymous Call
Rejection (ACR) supplementary service [ITU-T Recommendation Q.731, clause 4 (1993)]".
[23] ETSI EN 300 485 (V1.2.3): "Integrated Services Digital Network (ISDN); Definition and usage of
cause and location in Digital Subscriber Signalling System No. one (DSS1) and Signalling System
No. 7 (SS7) ISDN User Part (ISUP) [ITU-T Recommendation Q.850 (1998) with addendum
modified]".
[24] ETSI EN 300 403-1: "Integrated Services Digital Network (ISDN); Digital Subscriber Signalling
System No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control;
Part 1: Protocol specification [ITU-T Recommendation Q.931 (1993), modified]".
[25] IETF RFC 3966 (December 2004): "The tel URI for Telephone Numbers".
2.2 Informative references
Not applicable.
3 Definitions and abbreviations
For the purposes of the present document, the terms, definitions and abbreviations given in 3GPP TS 29.163 [1],
clauses 7.2.3 and 7.4 apply.
ETSI
8 ETSI ES 283 027 V2.4.0 (2008-04)
Endorsement notice
The present document endorses 3GPP TS 29.163: "3rd Generation Partnership Project; Technical Specification Group
Core Network and Terminals; Interworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit
Switched (CS) networks (Release 7)" [1], the contents of which apply together with the following modifications:
Clauses 6.3, 7.3, 8, 9.2.2.1, 9.2.2.2, 9.2.3.1, 9.2.3.2, 9.2.4.1, 9.2.5.1, 9.2.6.1, 9.2.7.1, 9.2.8.1, 9.2.8.3 and annex B do not
apply to this recommendation.
NOTE: Underlining and/or strike-out are used to highlight detailed modifications where necessary.
Global modifications to 3GPP TS 29.163 Release 7
Throughout the text of the 3GPP TS 29.163 Release 7
Replace references as shown in table 1.
Table 1
References in 3GPP TS 29.163 [1] Replaced references
ITU-T Recommendation Q.761 EN 300 356-1 [2]
ITU-T Recommendation Q.762 EN 300 356-1 [2]
ITU-T Recommendation Q.763 EN 300 356-1 [2]
ITU-T Recommendation Q.764 EN 300 356-1 [2]
3GPP TS 24.229 ES 283 003 [3]
3GPP TS 23.228 ES 282 007 [4]
ITU-T Recommendation Q.850 (1998) EN 300 485 [23]
ITU-T Recommendation Q.731.3 EN 300 356-3 [5]
ITU-T Recommendation Q.731.4 EN 300 356-4 [6]
ITU-T Recommendation Q.731.5 EN 300 356-5 [7]
ITU-T Recommendation Q.731.6 EN 300 356-6 [8]
ITU-T Recommendation Q.731.7 EN 300 356-11 [13]
ITU-T Recommendation Q.731.8 EN 300 356-10 [12]
ITU-T Recommendation Q.732.2 EN 300 356-15 [16]
ITU-T Recommendation Q.732.3 EN 300 356-15 [16]
ITU-T Recommendation Q.732.4 EN 300 356-15 [16]
ITU-T Recommendation Q.732.5 EN 300 356-15 [16]
ITU-T Recommendation Q.732.7 EN 300 356-14 [15]
ITU-T Recommendation Q.733.1 EN 300 356-17 [18]
ITU-T Recommendation Q.733.2 EN 300 356-16 [17]
ITU-T Recommendation Q.733.3 EN 300 356-18 [19]
ITU-T Recommendation Q.733.4 EN 300 356-7 [9]
ITU-T Recommendation Q.733.5 EN 300 356-20 [21]
ITU-T Recommendation Q.734.1 EN 300 356-12 [14]
ITU-T Recommendation Q.734.2 EN 300 356-19 [20]
ITU-T Recommendation Q.735.1 EN 300 356-9 [11]
ITU-T Recommendation Q.737.1 EN 300 356-8 [10]

ETSI
9 ETSI ES 283 027 V2.4.0 (2008-04)
Clause 2
Modify as follows:
[77] IETF draft-ietf-sip-acr-code-03 "Rejecting Anonymous Requests in the Session Initiation Protocol
(SIP)"
[77] IETF RFC 5079: "Rejecting Anonymous Requests in the Session Initiation Protocol (SIP)".
[89] draft-ejzak-sipping-p-em-auth-03.txt (January 2007): "Private Header (P-Header) Extension to the
Session Initiation Protocol (SIP) for Authorization of Early Media".
[89] IETF RFC 5009: "Private Header (P-Header) Extension to the Session Initiation Protocol (SIP) for
Authorization of Early Media".
[91] ETSI EN 300 403-1: "Integrated Services Digital Network (ISDN); Digital Subscriber Signalling
System No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control; Part
1: Protocol specification [ITU-T Recommendation Q.931 (1993), modified]".
[92] IETF RFC 3966: "The tel URI for Telephone Numbers".
[93] ISO/IEC 8348: "Information technology Open Systems Interconnection Network service
definition".
Clause 7.2.3.1.2.5 Transmission medium requirement
Modify as follows:
The I-MGCF may either transcode the selected codec(s) to the codec on the PSTN side or it may attempt to interwork
the media without transcoding. If the I-MGCF transcodes, it shall select the TMR parameter to "3,1 kHz audio". If the
I-MGCF does not transcode, it should map the TMR, USI and Access Transport parameters from the selected codec
according to table 2a. The support of any of the media listed in table 2a is optional. The SDP for the data transfer with
64 kbit/s clearmode shall be mapped to the TMR "64 kbit/s unrestricted".
If the XML BearerCapability element is received in the INVITE the mapping of the USI shall be taken from the
BearerCapability XML, else the USI shall be derived from the SDP attributes as shown in table2a.
Add clause 7.2.3.1.2.1.5a
7.2.3.1.2.5a Transmission medium requirement prime and USI prime (optional)
The Fallback mechanism shall only apply if a XML Bearer Capability element appears within the INVITE Request.
When the INVITE request includes multiple audio codecs with codec appearing in table 2a then the I-MGCF shall:
- If the first stated codec in the INVITE is a codec appearing in table 2a and is the equivalent as stated within the
second Bearer Capability in the XML Bearer Capability element then the I-MGCF shall map the XML Bearer
Capability element into the TMR and USI prime.
- If the second stated codec in the INVITE is a codec appearing in table 2a and is the equivalent as stated within
the first Bearer Capability in the XML Bearer Capability element then the I-MGCF shall map the XML Bearer
Capability element into the TMR prime and USI.
- If the compared codec stated within the INVITE is not equivalent as stated within XML Bearer Capability
element then the XML Bearer Capability element shall be discarded.
If the Fallback mechanism is not supported by the terminating network the procedures as described within
clause 7.2.3.1.2.5 shall apply.
In cases where the fallback appears within the terminating entity and sends back a codec to which is fallen back then the
I-MGCF shall only apply the cut-though to the chosen codec.
In cases where the fallback appears within the terminating entity and sends back a SDP Answer that is equivalent with
the TMR prime codec (fallback codec) then the I-MGCF shall only apply the cut-though to the fallback codec.
ETSI
10 ETSI ES 283 027 V2.4.0 (2008-04)
In cases where preconditions are used the I-MGCF has to wait for the SDP answer where the preconditions are met and
fallback codec is sent back.
Add clause 7.2.3.1.2.10
7.2.3.1.2.10 Access Transport Parameter and User Tele Service
When an INVITE was received containing a PSTN XML body as defined in ES 283 003 [3], an available
"ProgressIndicator" element can be as a network option mapped into a Progress Indicator in the Access Transport
Parameter of the sent IAM
Table 7a0.1: Mapping of PSTN XML elements with ISUP Parameters
INVITE  IAM
PSTN XML ISUP Parameter Content
ProgressIndicator ProgresAccess Transport Parameter s indicator
HighLayerCompatibility High layer compatibility (Note)
LowLayerCompatibility Low layer compatibility
BearerCapability User Service Information
HighLayerCompatibility User Tele Service High layer compatibility (Note)
NOTE: If two high layer compatibility information elements are received, they are transferred in the same order as
received in the INVITE message in the access transport parameter of the initial address message.

Clause 7.2.3.1.4 Sending of 180 ringing
Modify as follows:
The I-MGCF shall send the SIP 180 Ringing when receiving any of the following messages:
- ACM with Called party's status indicator set to subscriber free.

I-MGCF
ACM
180 Ringing
(Subscriber Free)
P-Early-Media (1)
Ring tone
NOTE: Including the P-Early-Media Header is a network option for a speech call.

Figure 6: The receipt of ACM
- CPG with Event indicator set to alerting
I-MGCF
180 Ringing
CPG (Alerting)
P-Early-Media (1)
Ring tone
NOTE: Including the P-Early-Media Header is a network option for a speech call.

Figure 7: Receipt of CPG (Alerting)
ETSI
11 ETSI ES 283 027 V2.4.0 (2008-04)
For a speech call, if the I-MGCF supports the P-Early-Media header as a network option, and if the INVITE request
includes the P-Early-Media header, the I-MGCF shall include in the SIP 180 ringing response a P-Early-Media header
authorizing early media, except when:
- the I-MGCF has already sent a reliable provisional response including a P-Early-Media header, as defined in
RFC5009 [89]; and
- the most recently sent P-Early-Media header authorized early media.
NOTE: If the I-MGCF signals the P-Early-Media header authorizing early media, then the IMS can expect tones
or announcements to the calling party to flow from the CS network via an MGW controlled by the
I-MGCF. In particular, once the I-MGCF sends the 180 Ringing response, ringback is expected in media
from the CS network.
Received PSTN XML elements shall be mapped as shown in table 7a0.2.
Table 7a0.2: ISUP Parameters with Mapping of PSTN XML elements
18x CPG or ACM
PSTN XML ISUP Parameter Content
ProgressIndicator ProgresAccess Transport Parameter s indicator
HighLayerCompatibility High layer compatibility (Note)
LowLayerCompatibility Low layer compatibility
NOTE: If two high layer compatibility information elements are received, they are transferred in the same order as
received in the INVITE message in the access transport parameter of the initial address message.

Table 7a0.3: Sending criteria of the XML with Progress indicator X
← 180 Ringing ←ACM
PSTN XML body with Progress indicator X Content
No. 1 Backward call indicators parameter
(Call is not end-to-end ISDN: further progress information may ISDN User Part indicator
be available in-band)  0 ISDN User Part not used all the way
No. 2 Backward call indicators parameter
(Destination address is non-ISDN) ISDN User Part indicator
1 ISDN User Part used all the way
ISDN access indicator
0 Terminating access non-ISDN
No. 4 Backward call indicators parameter
(Call is returned to ISDN)   ISDN User Part indicator
1 ISDN User Part used all the way
ISDN access indicator
1 Terminating access ISDN
Progress indicator
Progress indicator information elements possibly present in the access transport parameter of the Address Complete
Message (ACM) are transferred into the PSTN XML body (as defined in ES 283 003 [3]) of the 180 Ringing sent to the
calling user.
Clause 7.2.3.1.4A Sending of 183 Session Progress for early media scenarios
Modify as follows:
If SIP preconditions are used, the first 183 Session Progress will be sent after the reception of the INVITE request,
before any ISUP message has been received from the CS network. The I-MGCF shall not include the P-Early-Media
header in any SIP message before it receives an ISUP ACM.
ETSI
12 ETSI ES 283 027 V2.4.0 (2008-04)
On receipt of an ACM with the options described in table 7a2 the I-MGCF can be sent, as a network option, a
183 Session Progress response with following options:
Table 7a2: Sending criteria of the XML with Progress indicator X
← 183 Session Progress ←ACM
PSTN XML body with Progress indicator X Content
No. 1 Backward call indicators parameter
(Call is not end-to-end ISDN: further progress information ISDN User Part indicator
may be available in-band)  0 ISDN User Part not used all the way
No. 2 Backward call indicators parameter
(Destination address is non-ISDN) ISDN User Part indicator
1 ISDN User Part used all the way
ISDN access indicator
0 Terminating access non-ISDN
No. 4 Backward call indicators parameter
(Call is returned to ISDN)   ISDN User Part indicator
1 ISDN User Part used all the way
ISDN access indicator
1 Terminating access ISDN
Progress indicator
Progress indicator information elements possibly present in the access transport parameter of the Address Complete
Message (ACM) are transferred into the PSTN XML body (as defined in ES 283 003 [3]) of the 183 Session Progress
sent to the calling user.
For a speech call upon receipt of one of the following messages, if the I-MGCF supports the P-Early-Media header as a
network option, and if the I-MGCF has received the P-Early-Media header in the INVITE request, and has not already
sent a provisional response including a P-Early-Media header with parameters indicating authorization of early media,
then the I-MGCF shall send the 183 Session Progress response with a P-Early-Media header authorizing early media:
- ACM with the value of the called party's status indicator "no indication" and one of the options described in
table 7a1. Based on local configuration, the I-MGCF may also send a 183 Session Progress response with a
P-Early-Media header authorizing early media if it receives an ACM with other parameters than described in
table 7a1.
I-MGCF
ACM
183 Progress
(No indication)
P-Early-Media
appropriate announcement
Figure 7c: Receipt of ACM "No indication"
Table 7a.1: ACM Parameters that trigger the 183 Session Progress response
←183 Session Progress ←ACM
1 ）Optional backward call indicators parameter
183 Session Progress response including a P-Early-Media
In-band information indicator
header authorizing early media, if not already sent
1 In-band info.
2 ）Backward call indicators parameter
ISDN User Part indicator
0 ISDN User Part not used all the way

NOTE: As a network option the I-MGCF can also map ACM into 183 in other cases than those described in
table 7a1.
ETSI
13 ETSI ES 283 027 V2.4.0 (2008-04)
- CPG message, when:
1. Event indicator is set to "in-band information or an appropriate pattern is now available"; or
2. Event indicator is set to "Progress" and one of the options described in table 7b1.

I-MGCF
CPG
183 Progress
(in-band information available)
P-Early-Media
appropriate announcment
Figure 7d: Receipt of CPG (in-band information available)
Table 7b.1: CPG Parameters that trigger the 183 Session Progress response
←183 Session Progress ←CPG
Event indicator
183 Session Progress response including a P-Early- 000 0010 (progress)
Media header authorizing early media, if not already
1 ）Optional backward call indicators parameter
sent
In-band information indicator
0 In-band info .
2 ）Backward call indicators parameter
ISDN User Part indicator
0 ISDN User Part not used all the way
NOTE 1: The mapping of the contents in the CPG message is only relevant if the information received in the
message is different compared to earlier received information, e.g. in the ACM message or a CPG
message received prior to this message.
NOTE 2: 183 Session Progress message including a P-Early-Media header authorizing early media may only be
sent for a speech call.
NOTE: As a network option the I-MGCF can also map CPG into 183 in other cases than those described in
table 7a1.
Received PSTN XML elements shall be mapped as shown in table 7a0.2
On receipt of an CPG with the options described in table 7a3 the I-MGCF can be sent, as a network option, 183 Session
Progress response with following options:
Table 7a3 : Sending criteria of the XML with Progress indicator X
← 183 Session Progress ←CPG
PSTN XML body with Progress indicator X Content
No. 1 Backward call indicators parameter
(Call is not end-to-end ISDN: further progress information may
ISDN User Part indicator
be available in-band)  0 ISDN User Part not used all the way
No. 2 Backward call indicators parameter
(Destination address is non-ISDN) ISDN User Part indicator
1 ISDN User Part used all the way
ISDN access indicator
0 Terminating acce
...