SIST ETS 300 009 E1:2003

• Abstract:

  T/S 43-03

• 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 ETS 300 009 ed.1 (1991-12) - Integrated Services Digital Network (ISDN); Signalling System No.7; Signalling Connection Control Part (SCCP) [connectionless service] to support international interconnection

SIST ETS 300 009 E1:2003 is the Slovenian standard from SIST that adopts ETS 300 009 Edition 1 from ETSI. It specifies how the Signalling Connection Control Part (SCCP) connectionless service is used to support international interconnection in Integrated Services Digital Network (ISDN) and Public Switched Telephone Network (PSTN) signalling System No. 7 networks. In practice, it tells signalling engineers and network operators how international SCCP routing, addressing, load sharing and a small set of management actions are to work.

What does SIST ETS 300 009 E1:2003 specify?

SIST ETS 300 009 E1:2003 specifies the SCCP connectionless service for international network interconnection. It is based on CCITT Recommendations Q.711 to Q.714 and Q.716, and it applies to the international network without restricting national networks.

The standard is organized into a foreword, Scope, Normative references, Symbols and abbreviations, Clause 4 on exceptions to CCITT Recommendations Q.711 to Q.714, Clause 5 on additions to the CCITT Recommendations, and a history section.

Its focus is on relay point and gateway functions. It provides the functions needed to bridge two Message Transfer Part (MTP) networks, but it does not define end point functions.

What are the key requirements of SIST ETS 300 009 E1:2003?

SIST ETS 300 009 E1:2003 tightens how SCCP is used in international signalling. The main practical effect is that international routing must use a global title, and the document narrows the allowed address forms and management actions.

Routing and addressing

For international routing, a global title must be available for every SCCP message. Routing on Destination Point Code (DPC) only, or on DPC plus SubSystem Number (SSN), does not apply in this standard.

The Routing Indicator (RI) is always set to route on global title. The required international address element is GT + SSN. For implementers, this means international SCCP addressing must carry the global title and the subsystem number together.

Management behaviour

The standard limits management procedures to updating SCCP translation tables when the primary node fails or recovers. Those updates use MTP-PAUSE and MTP-RESUME indications to move traffic to a back-up node and then back to the primary node.

When a destination becomes inaccessible, SCCP management marks the translation to the back-up node, if one exists, and marks the signalling point as prohibited. When the destination becomes accessible again, it restores translation to the primary node and marks the signalling point as allowed. No SCCP management messages or SCCP primitives are required, and no SCCP reaction to MTP-STATUS is needed.

Protocol classes and load sharing

Protocol classes 2 and 3 are not specified because the document covers connectionless service only. For class 0, SCCP inserts Signalling Link Selection (SLS) codes to support load sharing. For class 1, the originating node allocates SLS codes while respecting user sequence control, and relay nodes use a fixed mapping between incoming and outgoing SLS values.

In practice, implementers need to preserve in-sequence delivery where requested, while still balancing traffic across the signalling network.

SSN allocation for MAP support

Clause 5 adds SSN allocations for Mobile Application Part (MAP) use in national networks. It assigns additional SSNs for Home Location Register (HLR), Visited Location Register (VLR), Mobile Switching Centre (MSC), Equipment Identification Register (EIR), and a reserved value for an authentication centre.

This matters because systems that identify these network functions through SCCP must use the documented SSN code points consistently.

What terms does SIST ETS 300 009 E1:2003 define?

The document lists the abbreviations used in the standard. The most useful ones are:

• DPC (Destination Point Code) - the signalling point code used in SS7 routing.
• GT (Global Title) - the addressing information used for global-title-based routing.
• RI (Routing Indicator) - the field that tells SCCP how to route the message.
• SCCP (Signalling Connection Control Part) - the SS7 layer covered by this standard.
• SLS (Signalling Link Selection) - the code used for load sharing across signalling links.
• SSN (SubSystem Number) - the identifier for a user or subsystem behind SCCP.
• MTP (Message Transfer Part) - the SS7 transport part that supports SCCP.
• MAP (Mobile Application Part) - the mobile-network application area that motivates the added SSN allocations.

Who uses SIST ETS 300 009 E1:2003?

SIST ETS 300 009 E1:2003 is used by SS7 signalling engineers, telecom network operators, and equipment suppliers working on ISDN and PSTN interconnection. It is also relevant to teams that design SCCP routing, translation tables, gateway behaviour, and load sharing in international networks.

It matters to people who manage interconnects between national networks and the international network, especially where mobile-network identifiers such as HLR, VLR, MSC and EIR must be handled through SCCP.

What changed in SIST ETS 300 009 E1:2003 from the previous edition?

SIST ETS 300 009 E1:2003 is identified as identical to ETS 300 009 Edition 1. The history section notes the first edition in December 1991 and a later PDF conversion in May 1996.

Which standards are used with SIST ETS 300 009 E1:2003?

This standard uses the following companion documents:

• CCITT Recommendation Q.711 - functional description of SCCP.
• CCITT Recommendation Q.712 - SCCP message definitions and functions.
• CCITT Recommendation Q.713 - SCCP formats and codes.
• CCITT Recommendation Q.714 - SCCP procedures.
• CCITT Recommendation Q.716 - SCCP performance guidance.
• ETS 300 008 - MTP for international interconnection.

Together, these references provide the SCCP framework, the message and format rules, the procedures, the performance context, and the underlying MTP support.

What does the SIST ETS 300 009 E1:2003 document contain?

SIST ETS 300 009 E1:2003 contains the exception rules to CCITT Q.711 to Q.714 and the additional SSN assignments needed for international interconnection. It also includes the assumptions that MTP support comes from ETS 300 008 and that international routing uses a global title with country code.

The document does not reproduce application profiles or test suites. Instead, it gives the routing rules, management reactions, load-sharing behaviour, and SSN code-point assignments needed to implement SCCP correctly in international SS7 networks.

SLOVENSKI STANDARD
01-december-2003
Digitalno omrežje z integriranimi storitvami (ISDN) – Sistem signalizacije CCITT št.
7 – Krmilni del signalizacijske zveze (SCCP) – [nepovezavna storitev] za podporo
mednarodnemu medsebojnemu povezovanju
Integrated Services Digital Network (ISDN); Signalling System No.7; Signalling
Connection Control Part (SCCP) [connectionless service] to support international
interconnection
Ta slovenski standard je istoveten z: ETS 300 009 Edition 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 ETS 300 009
TELECOMMUNICATION December 1991
STANDARD
Source: ETSI TC-SPS Reference: T/S 43-03
ICS: 33.020
ISDN, CCITT SS7 No 7.
Key words:
Integrated Services Digital Network (ISDN);
CCITT Signalling System No. 7
Signalling Connection Control Part (SCCP)
[connectionless service] to support international interconnection
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - [e-mail]
X.400: Internet:
Tel.: [phone] - Fax: [phone]
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 1991. All rights reserved.
New presentation - see History box

Page 2
ETS 300 009: December 1991
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

Page 3
ETS 300 009: December 1991
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Symbols and abbreviations .7
4 Exceptions to CCITT Recommendations Q.711 to Q.714 .8
4.1 General .8
4.1.1 Routing .8
4.1.2 Address Information .8
4.1.3 Management procedures .8
4.2 Protocol classes.9
4.2.1 Protocol classes 2 & 3.9
4.2.2 Load sharing.9
5 Additions to CCITT Recommendations.9
5.1 SubSystem Number (SSN) allocation.9
History.10

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ETS 300 009: December 1991
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ETS 300 009: December 1991
Foreword
This European Telecommunication Standard (ETS) has been produced by the Signalling Protocols and
Switching (SPS) Technical Committee of the European Telecommunications Standards Institute (ETSI),
as working document T/S 43-03, and was adopted having passed through the ETSI standards approval
procedure.
This ETS is based on CCITT Recommendations Q.711 [1] to Q.714 [4] as recommended in the CCITT
Blue Book, 1988. The requirements of these CCITT Recommendations apply unless modified by the
exception statements contained in Clause 4 of this ETS. In addition, the standard includes the specific
requirements contained in Clause 5 of this ETS.
CCITT Recommendation Q.716 [5] shall also apply.
This ETS is also based on the following assumptions concerning the interconnection of national Signalling
Connection Control Parts (SCCPs):
- the Message Transfer Part (MTP) specified in ETS 300 008 [6] supports the SCCP for international
interconnection;
- at present, no SCCP users (subsystem) have been identified in the international network and,
therefore, no need exists for management messages to be originated or terminated. However,
Unitdata messages containing management information should be carried in the international
network as all other Unitdata messages.
- a global title including the country code, is required for routing in the international network. The
global title format of CCITT Recommendation Q.713 [3], § 3.4.2.3.4, is to be used (Global Title
Indicator = 0100).
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ETS 300 009: December 1991
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ETS 300 009: December 1991
1 Scope
The scope of this ETS is the further development of the CCITT Signalling System No. 7 protocols for both
the Integrated Services Digital Network (ISDN) and Public Switched Telephone Network (PSTN) following
the publication of CCITT Recommendations Q.711 [1] to Q.714 [4] and Q.716 [5].
...