SIST EN 300 356-20 V4.3.1:2004

• Abstract:

  Production of the stage 3n standard for the supplementary service Completion of Call to subscriber Not Responding (CCNR)

• Status: Published
• Publication Date: 31-Mar-2004
• 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: 01-Apr-2004
• Due Date: 01-Apr-2004
• Completion Date: 01-Apr-2004
• Ref Project: ETSI EN 300 356-20 V4.3.1 (2001-07) - 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]

SIST EN 300 356-20 V4.3.1:2004 is the Slovenian adoption of ETSI EN 300 356-20 V4.3.1, a European Standard from ETSI. It specifies the stage 3 protocol procedures and switching functions for the Integrated Services Digital Network (ISDN) Completion of Calls on No Reply (CCNR) supplementary service on the Signalling System No.7 (SS7) ISDN User Part (ISUP) international interface. It is used by network operators, switch vendors, and implementers who need to build, interconnect, or test CCNR signaling.

What does SIST EN 300 356-20 V4.3.1:2004 specify?

SIST EN 300 356-20 V4.3.1:2004 specifies the stage 3 of the CCNR supplementary service for ISDN over SS7. In practical terms, it defines the signaling procedures and switching functions needed to support the service between local exchanges on the international interface.

The standard is organized as a modification of ITU-T Recommendation Q.733, clause 5 (1999). The added text introduces scope and references, revises definitions and procedure clauses, and adds informative annexes for coding, interworking, and bibliography.

Annex	What it covers
ZA	Coding of the compatibility information for the CCNR Possible Indicator and CCSS parameter
ZB	Signalling interworking at originating and destination local exchanges
ZC	Bibliography

The scope also states that the document covers additional requirements when the service is provided via an intermediate ISDN. Charging aspects are outside the scope.

What are the key requirements of SIST EN 300 356-20 V4.3.1:2004?

SIST EN 300 356-20 V4.3.1:2004 focuses on how CCNR is set up, how it behaves when the called party becomes available, and how exchanges exchange the related SS7 and Transaction Capabilities (TC) messages. For implementers, the main task is to map the service rules into switch behavior, message content, and timer handling.

Service scope and network context

The standard applies to the international interconnection and keeps the specification of message formats, codes, and exchange actions. It also says that national-use formats and procedures are included for informative purposes when they are supported in a national network.

Retain option and request handling

Clause 3 revises the definition of the retain option so that, when supported at both ends, the CCNR request stays in the destination B queue after a failed attempt caused by busy or no reply. In practice, this affects whether the request is kept active for later recall or treated as finished.

Successful offer to destination B

Subclauses 9.3.1.2 d) and 9.3.5.2 d) describe what happens when the CCNR call is successfully offered to destination B. The originating local exchange releases transaction resources and deactivates the request, while the destination local exchange cancels the corresponding request and releases its resources. If user A activates CCNR again, the standard treats it as a new request and restarts the CCNR-T3 and CCNR-T7 timers.

Call progress and forwarding behavior

Clause 10.10.2.2 c) describes two outcomes after the destination side action: either the CCNR call is handled as a successful offer to destination B, or the TC-dialogue is terminated and, after the No Reply timer expires, the call is forwarded as a normal call with the CCSS parameter removed from the forwarded Initial Address message. This matters for gateway and exchange logic because the service must either complete or fall back cleanly.

Interworking with related services

Subclauses 10.27 to 10.29 note that Message Waiting Indication (MWI) and Selective Call Forwarding (SCF) have no impact on ISUP or the CCNR application service element (ASE), while Outgoing Call Barring (OCB) deactivates the CCNR request when the call is barred. That tells implementers which adjacent services need special handling and which do not.

Protocol flow and coding

Clause 12.2 provides the call flow between TC-BEGIN, TC-CONTINUE, and TC-END, alongside ISUP messages such as Initial Address Message (IAM), Address Complete Message (ACM), Call Progress (CPG), Alerting, and Answer Message (ANM). Annex ZA gives the proposed coding for the CCNR Possible Indicator parameter and the CCSS parameter, and Annex ZB maps the interworking at originating and destination local exchanges.

What terms does SIST EN 300 356-20 V4.3.1:2004 define?

• CCNR - Completion of Calls on No Reply, the supplementary service covered by the standard.
• CCSS parameter - The ISUP parameter used to carry CCNR-related call completion information in call setup.
• CCNR Possible Indicator parameter - A compatibility indicator showing that CCNR can be supported in the signaling path.
• Retain option - The option that keeps the CCNR request in the destination B queue if both networks support it.
• Originating local exchange (OLE) - The exchange that starts the CCNR-related signaling on behalf of user A.
• Destination local exchange (DLE) - The exchange that handles the called side and manages the CCNR request queue.
• Transaction Capabilities (TC) - The signaling dialogue layer used for CCNR request, acknowledgement, and remote-user-free exchanges.

Who uses SIST EN 300 356-20 V4.3.1:2004?

SIST EN 300 356-20 V4.3.1:2004 is used by public telecommunications operators, SS7/ISUP switch vendors, signaling gateway developers, and interoperability test labs. It is also relevant to engineers who configure international ISDN interconnects, quality managers who check protocol conformance, and buyers specifying network equipment that must support CCNR.

What changed in SIST EN 300 356-20 V4.3.1:2004 from the previous edition?

SIST EN 300 356-20 V4.3.1:2004 is the ETSI publication of the CCNR stage 3 specification with modifications to ITU-T Recommendation Q.733, clause 5 (1999). The modifications add Scope and References text, update the retain option definition, revise successful-offer handling, add subclauses for MWI, OCB, and SCF, replace the call-flow figure, and add informative Annexes ZA, ZB, and ZC.

Which standards are used with SIST EN 300 356-20 V4.3.1:2004?

• ITU-T Recommendation I.130 - Provides the three-level method used to describe telecommunication services.
• EN 301 134 - Gives the stage 1 service description for CCNR.
• EN 300 356-1 - Supplies the ISUP version 4 basic services framework.
• EN 300 356-2 - Provides the ISDN supplementary service base part used with this series.
• EN 300 403-1 - Gives the DSS1 signaling network layer for circuit-mode basic call control.
• ETS 300 121 - Provides the earlier ISUP version 1 international interconnection context.
• ETS 300 186 and ETS 300 187/C1 - Provide 3PTY service description and functional capabilities/information flows used in the interworking references.
• ETS 300 188-1 - Provides the DSS1 protocol reference for 3PTY-related interworking.
• ITU-T Recommendation Q.931 as modified by EN 300 403-1 - Supplies the basic call-control signaling reference used in the modified clauses.

What does the SIST EN 300 356-20 V4.3.1:2004 document contain?

The document contains modified clause text for scope, references, definitions, and detailed CCNR procedures, plus a signaling flow figure in clause 12.2. It also contains Annex ZA for parameter coding, Annex ZB for signaling interworking tables between Facility and TC components and SS7 messages, and Annex ZC as a bibliography. For readers implementing or testing the service, these parts show how CCNR messages, indicators, and exchange actions are expected to line up across the network.

SLOVENSKI STANDARD
01-april-2004
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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]
Ta slovenski standard je istoveten z: EN 300 356-20 Version 4.3.1
ICS:
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.

European Standard (Telecommunications series)
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]

2 ETSI EN 300 356-20 V4.3.1 (2001-07)
Reference
REN/SPAN-01082-20
Keywords
ISDN, ISUP, SS7, supplementary service, CCNR,
endorsement
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ETSI
3 ETSI EN 300 356-20 V4.3.1 (2001-07)
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Foreword
This European Standard (Telecommunications series) has been produced by ETSI Technical Committee Services and
Protocols for Advanced Networks (SPAN).
The present document is part 20 of a multi-part deliverable covering the ISDN User Part (ISUP) version 4 for the
international interface, as identified below:
Part 1: "Basic services [ITU-T Recommendations Q.761 to Q.764 (1999) modified]";
Part 2: "ISDN supplementary service [ITU-T Recommendation Q.730 (1999) modified]";
Part 3: "Calling Line Identification Presentation (CLIP) supplementary service [ITU-T Recommendation Q.731,
clause 3 (1993) modified]";
Part 4: "Calling Line Identification Restriction (CLIR) supplementary service [ITU-T Recommendation Q.731,
clause 4 (1993) modified]";
Part 5: "Connected Line Identification Presentation (COLP) supplementary service [ITU-T Recommendation
Q.731, clause 5 (1993) modified]";
Part 6: "Connected Line Identification Restriction (COLR) supplementary service [ITU-T Recommendation
Q.731, clause 6 (1993) modified]";
Part 7: "Terminal Portability (TP) supplementary service [ITU-T Recommendation Q.733, clause 4 (1993)
modified]";
Part 8: "User-to-User Signalling (UUS) supplementary service [ITU-T Recommendation Q.737, clause 1 (1997)
modified]";
Part 9: "Closed User Group (CUG) supplementary service [ITU-T Recommendation Q.735, clause 1 (1993)
modified]";
Part 10: "Subaddressing (SUB) supplementary service [ITU-T Recommendation Q.731, clause 8 (1992)
modified]";
Part 11: "Malicious Call Identification (MCID) supplementary service [ITU-T Recommendation Q.731,
clause 7 (1997) modified]";
Part 12: "Conference Call, add-on (CONF) supplementary service [ITU-T Recommendation Q.734,
clause 1 (1993) and implementors guide (1998) modified]";
Part 14: "Explicit Call Transfer (ECT) supplementary service [ITU-T Recommendation Q.732, clause 7 (1996)
and implementors guide (1998) modified]";
Part 15: "Diversion supplementary service [ITU-T Recommendation Q.732, clauses 2 to 5 (1999) modified]";
Part 16: "Call Hold (HOLD) supplementary service [ITU-T Recommendation Q.733, clause 2 (1993) modified]";
Part 17: "Call Waiting (CW) supplementary service [ITU-T Recommendation Q.733, clause 1 (1992) modified]";
ETSI
4 ETSI EN 300 356-20 V4.3.1 (2001-07)
Part 18: "Completion of Calls to Busy Subscriber (CCBS) supplementary service [ITU-T Recommendation
Q.733, clause 3 (1997) modified]";
Part 19: "Three-Party (3PTY) supplementary service [ITU-T Recommendation Q.734, clause 2 (1996) and
implementors guide (1998) modified]";
Part 20: "Completion of Calls on No Reply (CCNR) supplementary service [ITU-T Recommendation Q.733,
clause 5 (1999) modified]";
Part 21: "Anonymous Call Rejection (ACR) supplementary service [ITU-T Recommendation Q.731,
clause 4 (1993)]";
Part 31: "Protocol Implementation Conformance Statement (PICS) proforma specification for basic services";
Part 32: "Test Suite Structure and Test Purposes (TSS&TP) specification for basic services";
Part 33: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT)
proforma specification for basic services";
Part 34: "Protocol Implementation Conformance Statement (PICS) proforma specification for supplementary
services";
Part 35: "Test Suite Structure and Test Purposes (TSS&TP) specification for supplementary services";
Part 36: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT)
proforma specification for supplementary services".
In accordance with ITU-T Recommendation I.130 [1], the following three level structure is used to describe the
supplementary telecommunication services as provided by European public telecommunications operators under the
pan-European Integrated Services Digital Network (ISDN):
- Stage 1: is an overall service description, from the user's stand-point;
- Stage 2: identifies the functional capabilities and information flows needed to support the service described in
stage 1; and
- Stage 3: defines the signalling system protocols and switching functions needed to implement the service
described in stage 1.
The present document details the stage 3 aspects (signalling system protocols and switching functions) needed to
support the CCNR supplementary service. The stage 1 aspects are detailed in EN 301 134 [4].
NOTE: Currently no stage 2 document exists.
National transposition dates
Date of adoption of this EN: 13 July 2001
Date of latest announcement of this EN (doa): 31 October 2001
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 30 April 2002
Date of withdrawal of any conflicting National Standard (dow): 30 April 2002
Endorsement notice
The elements of ITU-T Recommendation Q.733, clause 5 (1999) apply, with the following modifications.
NOTE: New or modified text is indicated using sidebars. In addition, underlining and/or strike-out are used to
highlight detailed modifications where necessary.
ETSI
5 ETSI EN 300 356-20 V4.3.1 (2001-07)
Global modifications to ITU-T Recommendation Q.733,
clause 5
Insert the following two clauses (Scope and References) at the start of clause 2.
Scope
The present document specifies the stage three of the Completion of Calls on No Reply (CCNR) supplementary service
for the ISDN as provided by the European public telecommunications operators by means of the Signalling System
No.7 protocol. Stage three identifies the protocol procedures and switching functions needed to support a
telecommunication service (see ITU-T Recommendation I.130 [1]).
The present document specifies the additional requirements where the service is provided to the user via an intermediate
ISDN.
The present document does not specify the additional requirements where the service is provided to the user via a
telecommunications network that is not an ISDN.
Although the present document applies only to the international interconnection, the specification of functions, formats
and codes of messages and signals, and actions performed at originating and destination local exchanges are retained.
Formats, codes and procedures marked for national use are included for informative purposes for the international
interface specification. If these items so marked are supported within a national network and operator's network, then it
is proposed that they shall be supported in this manner.
NOTE: In the case where a national signalling system behaves differently, the international gateway exchange is
to support both the national network concerned and the international network.
Charging aspects are outside the scope of the present document.
References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
• 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.
• For a non-specific reference, the latest version applies.
[1] ITU-T Recommendation I.130 (1988): "Method for the characterization of telecommunication
services supported by an ISDN and network capabilities of an ISDN".
[2] ETSI ETS 300 121 (1992): "Integrated Services Digital Network (ISDN); Application of the ISDN
User Part (ISUP) of CCITT Signalling System No.7 for international ISDN interconnections
(ISUP version 1)".
[3] ETSI EN 300 356-1: "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]".
[4] ETSI EN 301 134 (V1.1.1): "Integrated Services Digital Network (ISDN); Completion of Calls on
No Reply (CCNR) supplementary service; Service description".
[5] ETSI ETS 300 186 (1993): "Integrated Services Digital Network (ISDN); Three-Party (3PTY)
supplementary service; Service description".
ETSI
6 ETSI EN 300 356-20 V4.3.1 (2001-07)
[6] ETSI ETS 300 187/C1 (1994): "Integrated Services Digital Network (ISDN); Three-Party (3PTY)
supplementary service; Functional capabilities and information flows".
[7] ETSI EN 300 356-2: "Integrated Services Digital Network (ISDN); Signalling System No.7 (SS7);
ISDN User Part (ISUP) version 4 for the international interface; Part 2: ISDN supplementary
service [ITU-T Recommendation Q.730 (1999) modified]".
[8] 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]".
[9] ETSI ETS 300 188-1 (1993): "Integrated Services Digital Network (ISDN); Three-Party (3PTY)
supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 1: Protocol specification".
Throughout the text of ITU-T Recommendation Q.733, clause 5
Replace references as shown in table 1.
Table 1
Reference in ITU-T Recommendation Modified reference
Q.733, clause 5
ITU-T Recommendation I.254.2 ETS 300 186 [5]
ITU-T Recommendation Q.84, clause 2 ETS 300 187 [6]
ITU-T Recommendation Q.730 ITU-T Recommendation Q.730 as modified by EN 300 356-2 [7]
ITU-T Recommendation Q.761 ITU-T Recommendation Q.761 as modified by EN 300 356-1 [3]
ITU-T Recommendation Q.762 ITU-T Recommendation Q.762 as modified by EN 300 356-1 [3]
ITU-T Recommendation Q.763 ITU-T Recommendation Q.763 as modified by EN 300 356-1 [3]
ITU-T Recommendation Q.764 ITU-T Recommendation Q.764 as modified by EN 300 356-1 [3]
ITU-T Recommendation Q.767 ETS 300 121 [2]
ITU-T Recommendation Q.931 ITU-T Recommendation Q.931 as modified by EN 300 403-1 [8]
ITU-T Recommendation Q.954, clause 2 ETS 300 188-1 [9]
Clause 3
Modify the d
...