SIST EN 301 265 V1.1.1:2005

SIST EN 301 265 V1.1.1:2005 is the Slovenian adoption of EN 301 265 V1.1.1 from ETSI. It specifies the QSIG inter-exchange signalling protocol at the Q reference point for the call interception additional network feature in Private Integrated Services Network (PISN). In practice, it is the document to use when implementing or checking how PISN exchanges signal support for call interception.

What does SIST EN 301 265 V1.1.1:2005 specify?

SIST EN 301 265 V1.1.1:2005 gives the stage 3 description of the call interception supplementary service for PISN. The standard focuses on signalling at the inter-exchange level, so it matters to anyone implementing exchange-to-exchange behaviour rather than only service concepts.

The document is based on ISO/IEC 15054 (1997) and is published as an EN with agreed modifications. The scope points readers to ECMA DTR/ECMA-00002 (ECMA-TR/SVC) for the service description and to ENV 41 005 for the definition of stages.

What are the key requirements of SIST EN 301 265 V1.1.1:2005?

SIST EN 301 265 V1.1.1:2005 specifies how the QSIG protocol is used to support call interception at the Q reference point. For implementers, that means the signalling rules in the standard are the basis for interoperable PISN exchange behaviour.

Protocol and reference handling

The EN modifies the text of ISO/IEC 15054 by replacing several references with ETSI documents. In practice, this tells the reader which companion standards to apply when interpreting the protocol rules.

Coding of information elements

Clause 6.3.2.2 states that other information elements, such as Progress indicator, Party category and Calling party number, are coded according to the rules of ISO/IEC 11572, replaced in the EN by EN 300 172. This matters because correct element coding is needed for exchanged messages to be understood consistently.

SETUP message handling

Clause 6.6.5.1 updates the handling of information received in the incoming SETUP message, including Bearer capability, High layer compatibility, Low layer compatibility, Progress indicator and Party category. In practice, the standard tells implementers which fields to carry through and process during call setup.

Interaction with other supplementary services

Clause 6.9.16 states no interaction with Cordless Terminal Location Registration (SS-CTLR), and clause 6.9.17 states no interaction with Cordless Terminal Mobility Incoming Call (ANF-CTMI). This helps avoid unnecessary implementation logic where the feature is not meant to combine with those services.

Updated normative references

Clause 3 adds several PISN and PTN references, including circuit-mode basic services, name identification, generic supplementary services support, diversion, call transfer, call completion, Advice of Charge (AoC) supplementary services, and Recall Supplementary Service. For implementers, these references define the service framework around the call interception feature.

What terms does SIST EN 301 265 V1.1.1:2005 define?

• PISN - Private Integrated Services Network, the network environment covered by the standard.
• QSIG - the Q interface signalling protocol used at the Q reference point for PISN inter-exchange signalling.
• PSS1 - Private integrated Signalling System no. 1, the International Standards name for the same QSIG protocol family.
• ANF - additional network feature, the category used for call interception in the title.
• SETUP message - the call establishment message whose received fields are handled in clause 6.6.5.1.
• SS-CTLR - Cordless Terminal Location Registration, named in the interaction clauses.
• ANF-CTMI - Cordless Terminal Mobility Incoming Call, also named in the interaction clauses.

Who uses SIST EN 301 265 V1.1.1:2005?

SIST EN 301 265 V1.1.1:2005 is used by telecom engineers, PISN and PBX equipment vendors, protocol implementers, and test or interoperability teams. It is also relevant to quality managers and buyers who need to confirm that a system supports call interception signalling in a standards-based way.

What changed in SIST EN 301 265 V1.1.1:2005 from the previous edition?

SIST EN 301 265 V1.1.1:2005 approves ISO/IEC 15054 (1997) as an EN with agreed modifications. The stated changes include updated normative references, replacement of several ISO/IEC and ITU-T references with ETSI/EN documents, revised text on coding of information elements, revised SETUP message handling, and added clauses stating no interaction with SS-CTLR and ANF-CTMI.

Which standards are used with SIST EN 301 265 V1.1.1:2005?

The document points to these companion standards and what they contribute:

What does the SIST EN 301 265 V1.1.1:2005 document contain?

The document contains the EN text of ISO/IEC 15054 with ETSI modifications, including a replacement table for references used throughout the standard. It also includes targeted changes in clause 6 for information-element coding, SETUP message handling, and service interactions.

For readers who need to implement or verify the feature, the most useful parts are the modified clause 3 references and the operational subclauses in section 6. Those parts show how call interception fits into the wider PISN signalling environment and where related service behaviour is explicitly constrained.