SIST EN 300 356-19 V3.1.3:2003

SIST EN 300 356-19 V3.1.3:2003 is the Slovenian version of EN 300 356-19 V3.1.3, an ETSI European Standard for ISDN signalling. It specifies the stage 3 protocol procedures and switching functions for the Three-Party (3PTY) supplementary service on the international interface of the Integrated Services Digital Network (ISDN) using Signalling System No.7 (SS7) ISUP version 3. It is intended for people who design, implement, test, or operate ISDN speech services and interconnection.

What does SIST EN 300 356-19 V3.1.3:2003 specify?

SIST EN 300 356-19 V3.1.3:2003 specifies the stage 3 of the Three-Party (3PTY) supplementary service for pan-European ISDN over the SS7 ISUP international interface. In practice, that means the document focuses on signalling procedures and switching behaviour, not on the user-facing service description or the service capabilities at a higher level.

The document is organised as a modified version of ITU-T Recommendation Q.734, clause 2 (1996), with added Scope and Normative references text, the main modified clause content, and informative Annex ZA.

What are the key requirements of SIST EN 300 356-19 V3.1.3:2003?

SIST EN 300 356-19 V3.1.3:2003 is built around the procedures needed to set up and control the 3PTY supplementary service at the signalling level. For implementers, the important point is that the standard tells you how exchanges should behave so the service works consistently across international interconnection.

Stage 3 focus

The standard covers stage 3 aspects only. Stage 1 service description is in ETS 300 186 and stage 2 functional capabilities and information flows are in ETS 300 187, so this part is the protocol-and-switching implementation layer.

Scope of application

The 3PTY supplementary service is applicable to telecommunication services carrying speech. That matters because the procedures are written for speech-based services, so network and switch implementations should be checked against that use case.

International interface only

The document applies to the international interconnection interface and does not specify additional protocol requirements for a non-ISDN network or for the national signalling interface. In practice, that means national network behaviour may need separate handling, even though the international gateway exchange may need to support both national and international behaviour where they differ.

National-use items

Message formats, codes, procedures, and actions marked for national use are kept in the specification for informative purposes. If a national network and operator network support those items, the document proposes that they be supported in that same way, which helps avoid mismatch at the gateway.

Gateway interoperability

The scope notes that if a national signalling system behaves differently, the international gateway exchange is to support both the national and international network behaviour concerned. This is important for interworking, because gateway design must accommodate both signalling variants rather than forcing one side to fail.

Compatibility information

Annex ZA gives the coding of the compatibility information for the generic notification parameter. That is the part implementers use when they need to encode or interpret how a notification parameter should be treated across transit, release, notification, discard, and broadband/narrowband interworking handling.

Informative treatment of subclause 2.8

Subclause 2.8 is stated to be informative only. In practice, that tells readers not to treat that subclause as the same level of implementation requirement as the rest of the normative text.

What terms does SIST EN 300 356-19 V3.1.3:2003 define?

SIST EN 300 356-19 V3.1.3:2003 uses a small set of technical terms that frame the service and protocol model.

• Integrated Services Digital Network (ISDN) - The digital network environment in which the supplementary service is specified.
• Signalling System No.7 (SS7) - The signalling system used for the international interface.
• ISDN User Part (ISUP) - The SS7 protocol part that carries ISDN call-control signalling.
• Three-Party (3PTY) - The supplementary service that supports a call involving three parties.
• Stage 3 - The level that defines protocol procedures and switching functions needed to implement the service.
• Digital Subscriber Signalling System No. one (DSS1) - The subscriber-side signalling system referenced in the companion 3PTY documents.

Who uses SIST EN 300 356-19 V3.1.3:2003?

SIST EN 300 356-19 V3.1.3:2003 is used by telecommunications operators, network engineers, switch vendors, and system integrators working on ISDN interconnection. It is also relevant to test laboratories and conformance teams that need to check protocol behaviour, compatibility information, and interworking at the international interface. Buyers and technical managers use it to confirm whether equipment or network behaviour supports the 3PTY supplementary service in the ISDN/SS7 environment.

What changed in SIST EN 300 356-19 V3.1.3:2003 from the previous edition?

SIST EN 300 356-19 V3.1.3:2003 is the V3.1.3 publication of EN 300 356-19. The document history lists earlier editions V3.1.1 and V3.1.2, and the text is an ETSI-approved version of ITU-T Recommendation Q.734, clause 2 (1996), with agreed modifications.

Which standards are used with SIST EN 300 356-19 V3.1.3:2003?

SIST EN 300 356-19 V3.1.3:2003 relies on a set of service-description, protocol, and companion ISUP documents.

• CCITT Recommendation I.130 - Gives the method for characterising telecommunication services and the three-level stage model used here.
• ETS 300 121 - Provides the earlier ISUP version 1 basis for international ISDN interconnections.
• ETS 300 186 - Defines the 3PTY service description at stage 1.
• ETS 300 187 - Defines the 3PTY functional capabilities and information flows at stage 2.
• ETS 300 188-1 - Gives the DSS1 protocol specification for the 3PTY service.
• EN 300 356-1 - Supplies the ISUP version 3 basic services framework.
• EN 300 356-2 - Supplies the ISUP version 3 supplementary services framework.
• EN 300 403-1 - Gives the DSS1 signalling network layer for circuit-mode basic call control.

What does the SIST EN 300 356-19 V3.1.3:2003 document contain?

SIST EN 300 356-19 V3.1.3:2003 contains the scope and normative reference material inserted around the modified text of ITU-T Recommendation Q.734 clause 2. It also includes reference replacement instructions, such as updating references to related ITU-T and ETSI documents, which helps align the 3PTY procedures with the EN 300 356 and EN 300 403 series.

The document also includes Annex ZA, which sets out compatibility information coding for the generic notification parameter. That annex is the part a designer or tester would consult when checking message coding and interworking behaviour at the signalling level.