SIST EN 300 426 V1.3.1:2005

SIST EN 300 426 V1.3.1:2005 is the Slovenian adoption of ETSI EN 300 426 V1.3.1, which endorses ISO/IEC 14846 (2003) with ETSI modifications. It specifies the inter-exchange signalling protocol for the Call intrusion supplementary service in Private Integrated Services Network (PISN) environments, for use at the Q reference point as part of PSS1, informally known as QSIG.

What does SIST EN 300 426 V1.3.1:2005 specify?

SIST EN 300 426 V1.3.1:2005 specifies how the Call intrusion supplementary service is signalled between exchanges in a PISN. In practice, it is the protocol document you use when you need interoperable call intrusion behaviour on QSIG/PSS1 networks.

The text shown here is organized as a foreword, an endorsement notice, Clause 3 on normative references, a table that replaces references used throughout ISO/IEC 14846, and document history. The scope is limited to the ETSI endorsement of the ISO/IEC standard, so the document mainly tells you how the international text is adapted for ETSI use.

What are the key requirements of SIST EN 300 426 V1.3.1:2005?

Clause 3 is modified so that references are treated as either specific or non-specific. For implementation, this matters because a specific reference is fixed to the cited edition, while a non-specific reference follows the latest version.

Clause 3 also adds a set of normative references that the Call intrusion protocol depends on. These companion standards cover circuit-mode basic services, 64 kbit/s bearer services, reference configuration, the generic supplementary-service protocol, and several related supplementary services and network features. In practice, this tells implementers which other PISN/PTN documents they need alongside this one.

Throughout the text of ISO/IEC 14846, the standard replaces ISO/IEC references with ETSI equivalents. This keeps the protocol aligned with the ETSI document set, so engineers must check the ETSI reference numbers when following the protocol text.

The document also replaces the wording “this International Standard” with “the present document”. That is a wording change, but it is important for reading the text correctly as an ETSI European Standard rather than a purely international one.

The foreword states that the standard specifies signalling at the Q reference point for the Call intrusion supplementary service. For users, this identifies the network interface and the service context that the protocol is meant to support.

The foreword also places the document in the PSS1 protocol family, informally known as QSIG. That matters because equipment claiming support for this service needs to fit into the wider PSS1/QSIG signalling model, not just the isolated feature.

What terms does SIST EN 300 426 V1.3.1:2005 define?

• Private Integrated Services Network (PISN) - The network environment for which the service and signalling protocol are specified.
• Integrated Services Digital Network (ISDN) - The concept base used by the PISN standards series.
• Open Systems Interconnection (OSI) - The standards framework mentioned in the foreword as the model used by the series.
• PSS1 - The protocol family that includes the signalling defined here.
• QSIG - The informal name used for the PSS1 protocol family.
• Call intrusion supplementary service - The service that allows the protocol to support intrusion into an active call.
• Q reference point - The network reference point where the signalling protocol is applied.

Who uses SIST EN 300 426 V1.3.1:2005?

SIST EN 300 426 V1.3.1:2005 is used by telecom equipment vendors, PISN and PBX interconnect engineers, and interoperability test teams. It is also relevant to quality managers and buyers who need to confirm that a system supports the Call intrusion supplementary service within QSIG/PSS1 environments.

The standard is most useful when specifying, implementing, testing, or integrating exchange-to-exchange signalling for private telephone networks. It also helps teams check which companion standards must be in place for a complete solution.

What changed in SIST EN 300 426 V1.3.1:2005 from the previous edition?

The document history shows earlier publication as ETS 300 426 V1.2.1 in March 1999, followed by the V1.3.1 approval and publication cycle in 2003-2004. The endorsement notice states that this version applies ISO/IEC 14846 (2003) with ETSI modifications.

The main documented changes are the updated reference set in Clause 3 and the replacement of ISO/IEC references throughout the text with ETSI equivalents. The wording also changes to refer to “the present document”.

Which standards are used with SIST EN 300 426 V1.3.1:2005?

Clause 3 also says that references can be specific or non-specific, which affects whether later revisions apply automatically.

What does the SIST EN 300 426 V1.3.1:2005 document contain?

The document contains the ETSI endorsement notice for ISO/IEC 14846 (2003), including the ETSI-specific modifications applied to the international text. It also contains the normative-reference update, the table that maps ISO/IEC references to ETSI references, and the standard's publication history.

For implementation and conformity work, this is the part that tells you which companion standards are tied to the Call intrusion service and how the reference set has been localized for ETSI use.