SIST EN 300 356-22 V1.1.1:2003

• Abstract:

  This document defines an enhancement of the ISUP protocol, the latter contained in ETS 300 356. The objective is to allow a prioritized call setup in case of an emergency situation, facilitating the organization of relief action. It focuses on marking the calls of emergency relief personnel in the international signalling network. Thus, the document provides a solution for supporting IEPS according to E.106 on the international connection section. Cooperation with SPAN 14 takes place , where appropriate. Work in ITU-T SG 11 will be observed.

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.080 - Integrated Services Digital Network (ISDN)
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI EN 300 356-22 V1.1.1 (2003-07) - Integrated Services Digital Network (ISDN); Signalling System No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 22: International Emergency Preference Scheme (IEPS) service [ITU-T Amendments (2002) to Q.761 - Q.764 (1999) modified]

SIST EN 300 356-22 V1.1.1:2003 is the Slovenian adoption of ETSI EN 300 356-22 V1.1.1 for the International Emergency Preference Scheme (IEPS) service. It specifies the ISUP signalling and switching behavior used to give emergency-relief calls preferential treatment on international ISDN/SS7 connections.

What does SIST EN 300 356-22 V1.1.1:2003 specify?

SIST EN 300 356-22 V1.1.1:2003 specifies an enhancement of the ISUP protocol for IEPS on the international interface. It is aimed at international circuit-switched telecommunications, and it focuses on how calls marked for IEPS are handled during setup and routing.

The standard is organized as a scope and references section, followed by specific amendments to the ITU-T material for actions required at outgoing, intermediate, and incoming international exchanges. The foreword also places it in the wider ISUP version 4 series, where Part 1 covers basic services and the later parts cover supplementary services and test specifications.

What are the key requirements of SIST EN 300 356-22 V1.1.1:2003?

The core requirement is priority handling for IEPS calls. In Clause 2.1.1.3 and Clause 2.1.2.3, calls identified as IEPS are to proceed with priority at outgoing, intermediate, and incoming international exchanges. In practice, operators must make sure emergency-relief traffic is recognized and treated ahead of ordinary call attempts.

Priority marking and preservation of IEPS treatment

When an outgoing international exchange receives IEPS information from the national network, the call is established with CPC set as IEPS call marking in the outgoing IAM. At an incoming international exchange, the outgoing IAM may carry IEPS call marking or national specific information for IEPS call treatment. This matters because the IEPS indication has to survive interworking across the international path.

Network controls that are not applied

The standard states that restrictive network management controls are not applied to IEPS calls. The examples named are Automatic Call Gapping, ISUP Signalling Congestion Control, Automatic Congestion Control, and Hard-to-Reach procedure. In practice, this means the network must not push IEPS traffic into the same congestion controls used for normal calls.

Queueing and call handling

If routing cannot find an outgoing circuit, the call is queued and given precedence over normal call attempts. The queued IEPS calls are handled before other call handling for the next free trunk, the queue is processed first come, first served, and the queue size is configurable according to traffic management. This is the part that turns “priority” into an operational behavior under load.

Early ACM handling and caller feedback

If queueing occurs, an early ACM may be returned with called party status set to “no indication” and the generic notification parameter set to “call completion delay.” The originating exchange can use that information to play tones or announcements to the caller. However, if continuity check was requested, the early ACM is withheld until a successful continuity indication is received.

Release if setup does not complete

If call and connection establishment does not succeed, the calls are released on expiry of T9, the answer supervision timer. This gives implementers a clear cleanup rule so priority calls do not remain stuck in the setup state.

The scope also notes that if a national signalling system conflicts with the measures described here, the international gateway is expected to provide interworking between the national and international behavior. That is important for operators running mixed national and international network rules.

What terms does SIST EN 300 356-22 V1.1.1:2003 define?

• Integrated Services Digital Network (ISDN) - the digital network environment for which the service is specified.
• Signalling System No.7 (SS7) - the signalling system used to carry the call-control information.
• ISDN User Part (ISUP) - the SS7 user part that handles ISDN call setup and related signalling.
• International Emergency Preference Scheme (IEPS) - the service that gives emergency-relief calls preferential treatment during call and connection setup.
• Initial Address Message (IAM) - the message used to set up the call on the outgoing path, including IEPS-related marking.
• Address Complete Message (ACM) - the message used here to signal call progress, including optional delay notification.
• Answer supervision timer (T9) - the timer that limits how long a non-completing call may remain before release.

Who uses SIST EN 300 356-22 V1.1.1:2003?

This standard is used by public telecommunications operators, especially in international gateway networks that carry ISDN/SS7 traffic. It is also used by switch and signalling engineers, protocol implementers, and interoperability test teams who need to support IEPS behavior in call setup.

Quality managers and buyers can use it to check whether a switch or network implementation supports priority handling for emergency traffic. It is relevant wherever international emergency relief communications must be carried over circuit-switched telephony.

Which standards are used with SIST EN 300 356-22 V1.1.1:2003?

• ITU-T Recommendation E.106 (2000) - defines the IEPS concept and the stage 1 description of the service.
• ETSI ETS 300 121 - provides the earlier ISUP version 1 basis for international ISDN interconnections.
• ETSI EN 300 356-1 - provides the Part 1 basic services baseline for ISUP version 4 on the international interface.

What does the SIST EN 300 356-22 V1.1.1:2003 document contain?

The document contains the ETSI amendments that add IEPS support to the ISUP version 4 framework. Its body gives the service scope, the reference list, and the specific text changes for outgoing, intermediate, and incoming international exchanges.

It also includes the detailed operational behavior for priority setup, queueing, optional early ACM feedback, and release on T9 expiry. In practice, that makes it a protocol and switching reference for implementation and interworking work, not a general policy document.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Integrated Services Digital Network (ISDN); Signalling System No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 22: International Emergency Preference Scheme (IEPS) service [ITU-T Amendments (2002) to Q.761 - Q.764 (1999) modified]33.080Digitalno omrežje z integriranimi storitvami (ISDN)Integrated Services Digital Network (ISDN)ICS:Ta slovenski standard je istoveten z:EN 300 356-22 Version 1.1.1SIST EN 300 356-22 V1.1.1:2003en01-december-2003SIST EN 300 356-22 V1.1.1:2003SLOVENSKI
STANDARD
Final draft ETSI EN 300 356-22 V1.1.1 (2003-02)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 22: International EmergencyPreference Scheme (IEPS) service[ITU-T Amendments (2002) to Q.761 - Q.764 (1999) modified]
ETSI Final draft ETSI EN 300 356-22 V1.1.1 (2003-02) 2
Reference DEN/SPAN-130304 Keywords emergency, endorsement, ISDN, ISUP, service, SS7 ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
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Important notice Individual copies of the present document can be downloaded from: http://www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at http://portal.etsi.org/tb/status/status.asp If you find errors in the present document, send your comment to: [e-mail] Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 2003. All rights reserved.
DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTM and the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. SIST EN 300 356-22 V1.1.1:2003

ETSI Final draft ETSI EN 300 356-22 V1.1.1 (2003-02) 3
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). All published ETSI deliverables shall include information which directs the reader to the above source of information. Foreword This European Standard (Telecommunications series) has been produced by ETSI Technical Committee Services and Protocols for Advanced Networks (SPAN), and is now submitted for the ETSI standards One-step Approval Procedure. The present document is part 22 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]"; SIST EN 300 356-22 V1.1.1:2003

ETSI Final draft ETSI EN 300 356-22 V1.1.1 (2003-02) 4
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 22: "International Emergency Preference Scheme (IEPS) service [ITU-T Amendments (2002) to
Q.761 - Q.764 (1999) modified]"; 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". The present document details the stage three aspects (signalling system protocols and switching functions) needed to support the International Emergency Preference Scheme (IEPS) service. The stage 1 aspects are detailed in ITU-T Recommendation E.106 [1].
Proposed national transposition dates Date of latest announcement of this EN (doa): 3 months after ETSI publication Date of latest publication of new National Standard or endorsement of this EN (dop/e):
6 months after doa Date of withdrawal of any conflicting National Standard (dow): 6 months after doa
Endorsement notice The elements of ITU-T Amendment 2 to Q.761, Amendment 1 to Q.762, Amendment 2 to 763 and Amendment 2 to Q.764 apply with the following modifications. SIST EN 300 356-22 V1.1.1:2003

ETSI Final draft ETSI EN 300 356-22 V1.1.1 (2003-02) 5
Global modifications to ITU-T Amendments to Q.761 - Q.764 Insert the following two clauses (Scope and References). Scope The present document specifies the signalling protocol and switching aspects of the International Emergency Preference Scheme (IEPS) service for the pan-European Integrated Services Digital Network (ISDN) as provided by the European public telecommunications operators by means of the Signalling System No.7 protocol for the ISDN User Part (ISUP). The present document does not specify the additional protocol requirements where the service is provided to the user via a telecommunications network that is not an ISDN. The present document does not specify the additional protocol requirements for the national signalling interface. NOTE 1: If the implementation of a signalling system in a national network conflicts with measures described here the international gateway of the network is expected to provide the interworking between the two. 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 2: In the case where a national signalling system behaves differently, the international gateway exchange is to support both the concerned national and international network. The IEPS service provides the calling party with preferential treatment during call and connection setup. The IEPS service is applicable to all international circuit switched telecommunication services. 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. Referenced documents which are not found to be publicly available in the expected location might be found at http://docbox.etsi.org/Reference. [1] ITU-T Recommendation E.106 (2000) "Description of an international emergency preference scheme (IEPS)" [2] ETSI ETS 300 121 (Edition 1): "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]". SIST EN 300 356-22 V1.1.1:2003

ETSI Final draft ETSI EN 300 356-22 V1.1.1 (2003-02) 6
Specific modifications to ITU-T Amendments to Q.761 - Q.764 (12/99) Amendment 2 to ITU-T Recommendation Q.761 is endorsed without any modifications. Amendment 1 to ITU-T Recommendation Q.762 is endorsed without any modifications. Amendment 2 to ITU-T Recommendation Q.763 is endorsed without any modifications. Amendment 2 to ITU-T Recommendation Q.764 is endorsed with the following modifications. In all chapters on Actions required at an outgoing, intermediate or incoming international exchange • in the first sentence the phrase "call establishment proceeds with priority" is improved to read "call and connection establishment proceeds with priority"; • in the second paragraph the phrase "the call is queued and shall take precedence over any other normal call attempts" is replaced by "then the call is placed at the top of the call handling queue in the exchange. The priority calls queued shall take priority over any other call handling for the next free trunk from that exchange. For that purpose the exchange continually tries to find a suitable outgoing trunk until call establishment is discontinued. The calls in the queue are handled in the order of "first come, first served". The size of the queue is configurable according to traffic management"; • in the first sentence of the third paragraph the first word "Optionally" is deleted and the words "may be" are replaced by the word "is"; • the first sentence of the third paragraph is continued with the words "indicating that the call request has been put into a waiting queue for priority call setup"; • after the first sent
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