ETSI TS 183 036 V3.6.1 (2019-06)

Core Network and Interoperability Testing (INT); ISDN/SIP interworking; Protocol specification

RTS/INT-00156

General Information

• Status: Published
• Publication Date: 13-Jun-2019
• Technical Committee: INT - Core Network and Interoperability Testing
• Current Stage: 12 - Completion
• Due Date: 30-Jun-2019
• Completion Date: 14-Jun-2019

Standards Content (Sample)

TECHNICAL SPECIFICATION
Core Network and Interoperability Testing (INT);
ISDN/SIP interworking;
Protocol specification
2 ETSI TS 183 036 V3.6.1 (2019-06)

Reference
RTS/INT-00156
Keywords
IMS, interworking, ISDN, SIP
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3 ETSI TS 183 036 V3.6.1 (2019-06)
Contents
Intellectual Property Rights . 7
Foreword . 7
Modal verbs terminology . 7
1 Scope . 8
2 References . 8
2.1 Normative references . 8
2.2 Informative references . 11
3 Definition of terms, symbols and abbreviations . 12
3.1 Terms . 12
3.2 Symbols . 12
3.3 Abbreviations . 13
4 General . 14
5 Interworking for IMS simulation/emulation services . 15
5.1 Basic Call . 15
5.1.1 Actions at the Outgoing AGCF/VGW . 15
5.1.1.1 Sending of the Initial INVITE . 15
5.1.1.1.0 Interworking of DSS1 SETUP or INFO into SIP INVITE request . 15
5.1.1.1.1 En-bloc sending according to ETSI EN 300 403-1, clause 5.1.1 . 16
5.1.1.1.2 Bearer capability mapping . 16
5.1.1.1.3 Mapping of Progress indicator/High Layer Compatibility/Low Layer Compatibility IE . 17
5.1.1.1.4 Request URI/To header field . 18
5.1.1.2 Receipt of a Provisional Response 18x . 21
5.1.1.2.0 General statement to provisional responses . 21
5.1.1.2.1 180 Ringing response . 21
5.1.1.2.2 Receipt of the 183 (Session Progress) response . 24
5.1.1.3 Receipt of the 200 OK INVITE . 27
5.1.1.4 Receipt of (BYE or Final Response) . 28
5.1.1.5 Sending of (BYE or CANCEL) . 30
5.1.1.6 Use of Overlap signalling (Optional) . 30
5.1.2 Actions at the Incoming AGCF/VGW . 30
5.1.2.1 Sending of the SETUP message . 30
5.1.2.2 Sending of the 18x from the destination VGW/AGCF . 34
5.1.2.3 Sending of the 200 OK INVITE . 36
5.1.2.4 Receipt of BYE/CANCEL . 38
5.1.2.5 Sending of BYE/4xx/5xx . 38
5.1.2.6 Sending of the DSS1 INFO (Optional) . 39
5.2 Supplementary services . 40
5.2.0 General statement to supplementary service interworking . 40
5.2.1 Communication Hold (HOLD) . 40
5.2.1.1 Actions at the Incoming AGCF/VGW . 40
5.2.1.1.1 Notification received from the network . 40
5.2.1.1.2 Invocation at coincident S and T reference point . 40
5.2.1.1.3 Notification received at T reference point . 41
5.2.1.2 Actions at the outgoing AGCF/VGW . 41
5.2.1.2.1 Notification received from the network . 41
5.2.1.2.2 Invocation at coincident S and T reference point . 41
5.2.1.2.3 Notification received at T reference point . 41
5.2.2 Connected Line Identification Presentation (COLP)/Connected Line Identification Restriction
(COLR) . 42
5.2.2.1 Actions at the incoming AGCF/VGW . 42
5.2.2.1.0 General statement to TIP . 42
5.2.2.1.1 Connected Line Identification Presentation (COLP) . 42
5.2.2.1.2 Connected Line Identification Restriction (COLR) . 44
5.2.2.2 Actions at the outgoing AGCF/VGW . 45
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4 ETSI TS 183 036 V3.6.1 (2019-06)
5.2.2.2.1 Connected Line Identification Presentation (COLP) . 45
5.2.2.2.2 Connected line identification restriction (COLR) . 47
5.2.3 Calling line Identification Presentation (CLIP)/Calling line Identification Restriction (CLIR) . 47
5.2.3.1 Actions at the incoming AGCF/VGW . 47
5.2.3.2 Actions at the outgoing AGCF/VGW . 49
5.2.4 Conference calling (CONF) . 52
5.2.5 Communication Diversion Services (CDIV) . 52
5.2.5.0 General information regarding the service . 52
5.2.5.1 Actions at the Outgoing AGCF/VGW . 52
5.2.5.1.1 Reception of a "call is diverting" notification . 52
5.2.5.1.2 Evaluation of History-Info header . 53
5.2.5.1.3 Procedures at the T reference point . 55
5.2.5.2 Actions at the incoming AGCF/VGW . 56
5.2.5.2.1 Interworking at the AGCF/VGW where a call is diverted within or beyond the private ISDN
(T reference point) . 56
5.2.5.2.2 Interworking at the coincident S and T reference point where a diverted call is presented . 57
5.2.5.2.3 Interworking at the AGCF/VGW where a diverted call is presented to a private ISDN (T
Reference point) . 59
5.2.5.2.4 Interworking at the AGCF/VGW where partial rerouting is requested from a private ISDN (T
Reference point) . 60
5.2.6 MCID . 61
5.2.6.1 Actions at the Outgoing AGCF/VGW . 61
5.2.6.2 Actions at the incoming AGCF/VGW . 61
5.2.7 Explicit Communication Transfer (ECT) . 61
5.2.7.1 Actions at the Outgoing AGCF/VGW . 61
5.2.7.1.0 General information regarding the service . 61
5.2.7.1.1 Coincident S and T reference point . 61
5.2.7.1.2 T reference point. 62
5.2.7.2 Actions at the incoming AGCF/VGW . 62
5.2.7.2.0 General information regarding the service . 62
5.2.7.2.1 Coincident S and T reference point . 62
5.2.7.2.2 T reference point. 64
5.2.8 Subaddressing (SUB) . 65
5.2.8.0 General information regarding the service . 65
5.2.8.1 Actions at the Outgoing AGCF/VGW . 66
5.2.8.2 Actions at the incoming AGCF/VGW . 67
5.2.9 Closed User Group (CUG) . 68
5.2.9.0 General information regarding the service . 68
5.2.9.1 Actions at the Outgoing AGCF/VGW . 68
5.2.9.2 Actions at the incoming AGCF/VGW . 69
5.2.10 User to User Service (UUS) . 69
5.2.10.0 General information regarding the service . 69
5.2.10.1 Actions at the Outgoing AGCF/VGW . 69
5.2.10.1.1 Service 1 (UUS1) implicit . 69
5.2.10.1.2 Service 1 (UUS1) explicit. 70
5.2.10.1.3 Service 2 . 71
5.2.10.1.4 Service 3 . 71
5.2.10.2 Actions at the incoming AGCF/VGW . 72
5.2.10.2.1 Service 1 (UUS1) implicit . 72
5.2.11 Call Waiting (CW) . 73
5.2.11.1 Actions at the Outgoing AGCF/VGW . 73
5.2.11.2 Actions at the incoming AGCF/VGW . 73
5.2.11.2.1 Procedure at coincident S and T reference point . 73
5.2.11.2.2 Notification received at T reference point . 74
5.2.12 Terminal Portability (TP) . 74
5.2.12.1 Actions at the outgoing AGCF/VGW . 74
5.2.12.1.1 Invocation at coincident S and T reference point . 74
5.2.12.1.2 Notification received at T reference point . 75
5.2.12.2 Actions at the incoming AGCF/VGW . 75
5.2.12.2.1 Invocation at coincident S and T reference point . 75
5.2.12.2.2 Notification received at T reference point . 75
5.2.13 Three-party (3PTY) . 75
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5 ETSI TS 183 036 V3.6.1 (2019-06)
5.2.13.0 General information regarding the service . 75
5.2.13.1 Notification received from the network . 76
5.2.13.2 Invocation at coincident S and T reference point . 76
5.2.13.3 Notification received at T reference point . 79
5.2.13.4 Notification received at T reference point . 79
5.2.14 Completion of Call to Busy Subscriber (CCBS) . 80
5.2.14.1 Actions at the outgoing AGCF/VGW . 80
5.2.14.2 Actions at the incoming AGCF/VGW . 80
5.2.15 Completion of Calls on No Reply (CCNR) . 81
5.2.15.1 Actions at the outgoing AGCF/VGW . 81
5.2.15.2 Actions at the incoming AGCF/VGW . 81
5.2.16 Advice Of Charge AOC . 82
5.2.16.0 General information regarding the service . 82
5.2.16.1 Actions at the outgoing AGCF/VGW . 82
5.2.17 Message Waiting Indication (MWI) . 83
5.3 DSS1 layer 2 failure . 84
5.3.1 DSS 1 data link reset and data link failure procedures in the outgoing AGCF/VGW . 84
5.3.2 DSS 1 data link reset and data link failure procedures in the incoming AGCF/VGW . 85
5.3.3 Release by the outgoing AGCF/VGW . 85
5.3.4 Release by the AGCF/VGW . 86
5.4 Service operation . 86
5.4.1 Call related service operation. 86
5.4.1.1 Malicious Call Identification (MCID) . 86
5.4.1.2 Explicit Communication Transfer (ECT) . 86
5.4.1.3 Closed User Group (CUG) . 87
5.4.1.4 Three Party Service (3PTY) . 87
5.4.1.5 Completion of Call to Busy Subscriber (CCBS) . 87
5.4.1.6 Completion of Calls on No Reply (CCNR) . 87
5.4.2 Call independent service configuration. 87
5.4.2.0 General requirements . 87
5.4.2.1 Communication Diversion Services (CDIV). 88
5.4.2.1.1 Communication Diversion activation . 88
5.4.2.1.2 Communication Diversion deactivation . 89
5.4.2.1.3 Communication Diversion interrogation . 90
5.4.2.1.4 Activation Status Notification Diversion . 91
5.4.2.2 Message Waiting Indication (MWI). 91
5.4.2.2.1 Activation of Message Waiting Indication (MWI) . 91
5.4.2.2.2 Deactivation of Message Waiting Indication (MWI) . 92
Annex A (normative): Keypad Procedures . 93
A.1 Generic procedure at the AGCF/VGW side . 93
A.2 Generic procedure at the AS side . 93
Annex B (normative): SDP mapping for ISDN 7 kHz service and Inter-working . 94
B.1 Originating Side . 94
B.2 Terminating side . 94
Annex C (normative): Timers . 96
Annex D (normative): Overlap Sending . 101
D.1 Multiple INVITE Overlap Dialling Procedures (Optional) . 101
D.1.1 Actions at the originating VGW/AGCF . 101
D.1.1.1 Terminating overlap signalling at originating VGW/AGCF. 101
D.1.1.2 Sending of INVITE without determining the end of address signalling . 101
D.1.1.3 Special handling of 404 Not Found and 484 Address Incomplete responses after sending of INVITE
without determining the end of address signalling . 102
D.1.2 Actions at the terminating VGW/AGCF . 109
D.2 In-Dialog Method (Optional) . 109
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6 ETSI TS 183 036 V3.6.1 (2019-06)
D.2.1 Actions at the originating VGW/AGCF . 109
D.2.1.1 Terminating overlap signalling at originating VGW/AGCF. 109
D.2.1.2 Sending of INVITE without determining the end of address signalling . 110
D.2.2 Actions at the terminating VGW/AGCF . 117
Annex E (normative): Direct Dialling in . 118
E.0 General Information . 118
E.1 Multiple INVITEs Method (Optional) . 118
E.1.1 Actions at the incoming AGCF/VGW. 118
E.1.1.1 Receipt of Subsequent INVITE messages . 118
E.2 In-Dialog Method (Optional) . 119
E.2.1 Actions at the incoming AGCF/VGW. 119
E.2.1.1 Receipt of Subsequent INVITE messages . 119
Annex F (informative): Handling and interworking of DSS1 messages and Information
Elements . 122
Annex G (informative): Message flows . 124
G.1 Three party . 124
G.2 Explicit Communication Transfer (ECT) . 130
Annex H (informative): Use of progress indicators . 132
Annex I (informative): Bibliography . 136
Annex J (informative): Change History . 137
History . 138

ETSI
7 ETSI TS 183 036 V3.6.1 (2019-06)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables 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 (https://ipr.etsi.org/).
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.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee Core Network and Interoperability
Testing (INT).
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
8 ETSI TS 183 036 V3.6.1 (2019-06)
1 Scope
The present document specifies the stage three protocol description of the signalling interworking between ISDN DSS1
protocol and SIP based on the concatenation of ETSI ES 283 027 [1], ETSI ES 283 003 [5] with ETSI
EN 300 899-1 [2]. The concatenation method describes only the SIP/ISDN parameter mapping without ISUP
procedures. In addition direct inter-working not supported by this concatenation of these existing inter-working
documents will be described.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference/.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI ES 283 027: "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 EN 300 899-1 (V1.1.2): "Integrated Services Digital Network (ISDN);Signalling System
No.7; Interworking between ISDN User Part (ISUP) version 2 and Digital Subscriber Signalling
System No. One (DSS1); Part 1: Protocol specification [ITU-T Recommendation Q.699,
modified]".
[3] Void.
[4] ETSI ES 282 007: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); IP Multimedia Subsystem (IMS); Functional architecture".
[5] ETSI ES 283 003 (V2.5.1): "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]".
[6] ETSI TS 183 007: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); PSTN/ISDN simulation services; Originating Identification
Presentation (OIP) and Originating Identification Restriction (OIR); Protocol specification".
[7] ETSI TS 183 008: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); PSTN/ISDN simulation services Terminating Identification
Presentation (TIP) and Terminating Identification Restriction (TIR); Protocol specification".
[8] ETSI TS 183 004: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN) PSTN/ISDN simulation services: Communication Diversion
(CDIV); Protocol specification".
[9] ETSI TS 183 005: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); PSTN/ISDN simulation services: Conference (CONF); Protocol
specification".
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9 ETSI TS 183 036 V3.6.1 (2019-06)
[10] ETSI TS 183 010: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); NGN Signalling Control Protocol; Communication HOLD
(HOLD) PSTN/ISDN simulation services; Protocol specification".
[11] ETSI EN 300 052-1: "Integrated Services Digital Network (ISDN); Multiple Subscriber Number
(MSN) supplementary service; Digital Subscriber Signalling System No. One (DSS1) protocol;
Part 1: Protocol specification".
[12] ETSI EN 300 055-1: "Integrated Services Digital Network (ISDN); Terminal Portability (TP)
supplementary service; Digital Subscriber Signalling System No. One (DSS1) protocol; Part 1:
Protocol specification".
[13] ETSI EN 300 058-1: "Integrated Services Digital Network (ISDN); Call Waiting (CW)
supplementary service; Digital Subscriber Signalling System No. One (DSS1) protocol;
Part 1: Protocol specification".
[14] ETSI EN 300 061-1: "Integrated Services Digital Network (ISDN); Subaddressing (SUB)
supplementary service; Digital Subscriber Signalling System No. One (DSS1) protocol;
Part 1: Protocol specification".
[15] ETSI EN 300 064-1: "Integrated Services Digital Network (ISDN); Direct Dialling In (DDI)
supplementary service; Digital Subscriber Signalling System No. One (DSS1) protocol;
Part 1: Protocol specification".
[16] ETSI EN 300 092-1: "Integrated Services Digital Network (ISDN); Calling Line Identification
Presentation (CLIP) supplementary service; Digital Subscriber Signalling System No. One (DSS1)
protocol; Part 1: Protocol specification".
[17] ETSI EN 300 093-1: "Integrated Services Digital Network (ISDN); Calling Line Identification
Restriction (CLIR) supplementary service; Digital Subscriber Signalling System No. One (DSS1)
protocol; Part 1: Protocol specification".
[18] ETSI EN 300 097-1: "Integrated Services Digital Network (ISDN); Connected Line Identification
Presentation (COLP) supplementary service; Digital Subscriber Signalling System No. One
(DSS1) protocol; Part 1: Protocol specification".
[19] ETSI EN 300 098-1: "Integrated Services Digital Network (ISDN); Connected Line Identification
Restriction (COLR) supplementary service; Digital Subscriber Signalling System No. One (DSS1)
protocol; Part 1: Protocol specification".
[20] ETSI EN 300 130-1: "Integrated Services Digital Network (ISDN); Malicious Call Identification
(MCID) supplementary service; Digital Subscriber Signalling System No. One (DSS1) protocol;
Part 1: Protocol specification".
[21] ETSI EN 300 138-1: "Integrated Services Digital Network (ISDN); Closed User Group (CUG)
supplementary service; Digital Subscriber Signalling System No. One (DSS1) protocol;
Part 1: Protocol specification".
[22] ETSI EN 300 141-1: "Integrated Services Digital Network (ISDN); Call Hold (HOLD)
supplementary service; Digital Subscriber Signalling System No. One (DSS1) protocol;
Part 1: Protocol specification".
[23] ETSI EN 300 185-1: "Integrated Services Digital Network (ISDN); Conference call, add-on
(CONF) supplementary service; Digital Subscriber Signalling System No. One (DSS1) protocol;
Part 1: Protocol specification".
[24] ETSI EN 300 188-1: "Integrated Services Digital Network (ISDN); Three-Party (3PTY)
supplementary service; Digital Subscriber Signalling System No. One (DSS1) protocol;
Part 1: Protocol specification".
[25] ETSI EN 300 196-1: "Integrated Services Digital Network (ISDN); Generic functional protocol for
the support of supplementary services; Digital Subscriber Signalling System No. One (DSS1)
protocol; Part 1: Protocol specification".
ETSI
10 ETSI TS 183 036 V3.6.1 (2019-06)
[26] ETSI TS 183 006: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); PSTN/ISDN simulation services; Message Waiting Indication
(MWI): Protocol specification".
[27] Void.
[28] ETSI TS 183 054: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); PSTN/ISDN simulation services; Protocol specification Closed
User Group (CUG)".
[29] 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]".
[30] Void.
[31] ETSI TS 183 047: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); NGN IMS Supplementary Services; Advice Of Charge
(AOC)".
[32] ETSI TS 183 028: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); Common Basic Communication procedures; Protocol
specification".
[33] Void.
[34] ETSI EN 300 207-1: "Integrated Services Digital Network (ISDN); Diversion supplementary
services; Digital Subscriber Signalling System No. One (DSS1); Part 1: Protocol specification".
[35] ETSI EN 300 369-1: "Integrated Services Digital Network (ISDN); Explicit Call Transfer (ECT)
supplementary service; Digital Subscriber Signalling System No. One (DSS1) protocol;
Part 1: Protocol specification".
[36] ETSI TS 183 029: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); PSTN/ISDN simulation services: Explicit Communication
Transfer (ECT); Protocol specification".
[37] ETSI EN 300 182-1: "Integrated Services Digital Network (ISDN); Advice of Charge (AOC)
supplementary service; Digital Subscriber Signalling System No. One (DSS1) protocol;
Part 1: Protocol specification".
[38] ETSI EN 300 286-1: "Integrated Services Digital Network (ISDN); User-to-User Signalling
(UUS) supplementary service; Digital Subscriber Signalling System No. One (DSS1) protocol;
Part 1: Protocol specification".
[39] ETSI EN 300 359-1: "Integrated Services Digital Network (ISDN); Completion of Calls to Busy
Subscriber (CCBS) supplementary service; Digital Subscriber Signalling System No. One (DSS1)
protocol; Part 1: Protocol specification".
[40] ETSI EN 301 065-1: "Integrated Services Digital Network (ISDN); Completion of Calls on No
Reply (CCNR) supplementary service; Digital Subscriber Signalling System No. One (DSS1)
protocol; Part 1: Protocol specification".
[41] Void.
[42] ETSI TS 183 043: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); IMS-based PSTN/ISDN Emulation Stage 3 specification".
[43] ETSI EN 301 798 (V1.1.1): "Services and Protocols for Advanced Networks (SPAN); Anonymous
Call Rejection (ACR) Supplementary Service; Service description".
[44] IETF RFC 4575 (2006): "A Session Initiation Protocol (SIP) Event Package for Conference State".
[45] IETF RFC 4244: "An Extension to the Session Initiation Protocol (SIP) for Request History
Information".
ETSI
11 ETSI TS 183 036 V3.6.1 (2019-06)
[46] ETSI TS 183 016: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); PSTN/ISDN simulation services; Malicious Communication
Identification (MCID); Protocol Specification".
[47] IETF RFC 3966: "The tel URI for Telephone Numbers".
[48] IETF RFC 4825: "The Extensible Markup Language (XML) Configuration Access Protocol
(XCAP)".
[49] ETSI TS 183 023: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); PSTN/ISDN simulation services; Extensible Markup Language
(XML) Configuration Access Protocol (XCAP) over the Ut interface for Manipulating NGN
PSTN/ISDN Simulation Services".
[50] IETF RFC 4916: "Connected Identity in the Session Initiation Protocol (SIP)".
[51] IETF RFC 4040: "RTP Payload Format for a 64 kbit/s Transparent Call".
[52] IETF RFC 3264: "An Offer/Answer Model with Session Description Protocol (SDP)".
[53] IETF RFC 3261: "SIP: Session Initiation Protocol".
[54] Recommendation ITU-T Q.931: "ISDN user-network interface layer 3 specification for basic call
control".
[55] Recommendation ITU-T Q.939: "Typical DSS 1 service indicator codings for ISDN
telecommunications services".
[56] Recommendation ITU-T T.38: "Procedures for real-time Group 3 facsimile communication over
IP networks".
[57] ETSI EN 300 745-1 (V1.2.4): "Integrated Services Digital Network (ISDN); Message Waiting
Indication (MWI) supplementary service; Digital Subscriber Signalling System No. one (DSS1)
protocol; Part 1: Protocol specification".
[58] ETSI TS 183 015: "Telecommunications and Internet Converged Services and Protocols for
Advanced Networking (TISPAN) NGN Signalling Control Protocol Communication Waiting
(CW) PSTN/ISDN simulation services".
[59] ETSI TS 124 642: "Digital cellular telecommunications system (Phase 2+); Universal Mobile
Telecommunications System (UMTS); LTE; Completion of Communications to Busy Subscriber
(CCBS) and Co
...