SIST EN 300 121 V1.2.1:2003

• Abstract:

  This amendment allows the use of IEPS in the SS7 networks.

• 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 300 121 V1.2.1 (2003-07) - Integrated Services Digital Network (ISDN); Application of the ISDN User Part (ISUP) of ITU-T Signalling System No. 7 (SS7) for international ISDN interconnections (ISUP version 1) Amendment 1: International Emergency Preference Scheme (IEPS) service [ITU-T Recommendation Q.767 Amendment 1 (2002), modified]

SIST EN 300 121 V1.2.1:2003 is the SIST adoption of an ETSI European Standard for IEPS support in Integrated Services Digital Network (ISDN) signalling. It specifies the signalling protocol and switching aspects for using the ISDN User Part (ISUP) of Signalling System No. 7 (SS7) on international ISDN interconnections. The standard is meant for public telecommunications operators and others who implement international circuit-switched services with priority handling for emergencies.

What does SIST EN 300 121 V1.2.1:2003 specify?

SIST EN 300 121 V1.2.1:2003 specifies how the International Emergency Preference Scheme (IEPS) is applied to ISUP in the international ISDN interface. Its focus is the international interconnection side, not the full end-to-end service design.

The document is organized as a short endorsed amendment with:

• a foreword explaining the purpose and stage 3 scope,
• a Scope section,
• a References section,
• a global modification note,
• Table 1 that changes references inside the base text,
• and a history section.

The scope also states what is outside the document:

• additional protocol requirements when the service is carried over a network that is not an ISDN,
• additional protocol requirements for the national signalling interface.

A note in the scope says that if a national signalling system conflicts with the measures described here, the international gateway is expected to provide interworking between the two.

What are the key requirements of SIST EN 300 121 V1.2.1:2003?

SIST EN 300 121 V1.2.1:2003 defines the signalling and switching rules needed to support IEPS in international ISDN interconnections. In practice, this is the part that engineers use to align network behaviour at the international gateway and the ISUP interface.

IEPS support in SS7/ISUP

The standard allows IEPS in SS7 networks through the ISUP of SS7. That matters because IEPS is carried as a network signalling function, not as a separate application layer service.

International interconnection only

The standard applies only to international interconnection. For a buyer or operator, that means the document is about cross-border gateway behaviour, not national signalling design.

Preferential treatment during setup

The scope says IEPS gives the calling party preferential treatment during call and connection setup. In practice, implementers need to make sure setup handling can recognize and prioritize IEPS traffic.

Applicable service range

The standard says IEPS applies to all international circuit-switched telecommunication services. That is important because the service is not limited to one narrow call type within the international circuit-switched environment.

Stage 3 signalling and switching aspects

The foreword says the document covers stage 3 aspects, meaning signalling system protocols and switching functions. For implementers, this is the level where network elements and gateways must behave in a defined way.

Endorsement with modifications

The document is an endorsement of ITU-T Recommendation Q.767 Amendment 1, with modifications. Table 1 replaces references in the base text, so anyone implementing the standard needs to use the modified reference set, not the original unmodified citation chain.

Interworking at the gateway

The scope note expects the international gateway to provide interworking if the national network uses a signalling system that conflicts with the measures here. In practice, this tells operators where to resolve differences between national and international behaviour.

What terms does SIST EN 300 121 V1.2.1:2003 define?

• ISDN - Integrated Services Digital Network, the circuit-switched network context for the standard.
• ISUP - ISDN User Part, the SS7 signalling part used for call control and interconnection.
• SS7 - Signalling System No. 7, the signalling system used to carry the ISUP procedures.
• IEPS - International Emergency Preference Scheme, a service that gives priority treatment during setup.
• Stage 3 - The signalling protocol and switching function level of the service specification.
• ITU-T - The International Telecommunication Union - Telecommunication Standardization Sector, the source of the base recommendation and related references.

Who uses SIST EN 300 121 V1.2.1:2003?

SIST EN 300 121 V1.2.1:2003 is used by European public telecommunications operators, international gateway designers, and SS7/ISUP engineers. It is also relevant to network planners, switch suppliers, and service managers who need to support IEPS on international circuit-switched interconnections.

What changed in SIST EN 300 121 V1.2.1:2003 from the previous edition?

SIST EN 300 121 V1.2.1:2003 is an amendment that adds International Emergency Preference Scheme (IEPS) service support to the ISUP international ISDN interconnection specification. The foreword identifies it as addition 1 covering IEPS service, and the amendment modifies the base ITU-T Recommendation Q.767 Amendment 1 and its related reference chain.

Which standards are used with SIST EN 300 121 V1.2.1:2003?

Standard	What it contributes
ITU-T Recommendation E.106	Describes IEPS and provides the service background referenced by the standard.
ETSI ETS 300 121 (1992)	The earlier ISUP international ISDN interconnection endorsement that is modified by this amendment.
ITU-T Recommendation Q.764	Provides ISUP signalling procedures used with the document.
ITU-T Recommendation Q.767 Amendment 1 (2002), modified	The base recommendation this European Standard endorses with modifications.

What does the SIST EN 300 121 V1.2.1:2003 document contain?

The document contains the endorsement notice, the scope and references inserted by the modification, and Table 1 that rewrites references inside the base recommendation. It also includes the foreword with the stage 3 description, the note on interworking at the international gateway, and the national transposition dates. The history section records the earlier ETS 300 121 publication and the later EN 300 121 V1.2.1 publication.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.,6'1Integrated Services Digital Network (ISDN); Application of the ISDN User Part (ISUP) of ITU-T Signalling System No. 7 (SS7) for international ISDN interconnections (ISUP version 1) Amendment 1: International Emergency Preference Scheme (IEPS) service [ITU-T Recommendation Q.767 Amendment 1 (2002), modified]33.080Digitalno omrežje z integriranimi storitvami (ISDN)Integrated Services Digital Network (ISDN)ICS:Ta slovenski standard je istoveten z:EN 300 121 Version 1.2.1SIST EN 300 121 V1.2.1:2003en01-december-2003SIST EN 300 121 V1.2.1:2003SLOVENSKI
STANDARD
ETSI ETSI EN 300 121 V1.2.1 (2003-07) 2
Reference REN/SPAN-130317 Keywords ISDN, ISUP, SS7, interworking, endorsement ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: [phone]
Fax: [phone]
Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88
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 300 121 V1.2.1:2003

ETSI ETSI EN 300 121 V1.2.1 (2003-07) 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). 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 European Standard (Telecommunications series) has been produced by ETSI Technical Committee Services and Protocols for Advanced Networks (SPAN). The present document is addition 1 covering t
...