SIST EN 301 256 V1.2.1:2005

SIST EN 301 256 V1.2.1:2005 is the Slovenian adoption of ETSI EN 301 256 V1.2.1 for Private Integrated Services Network (PISN) call interception. It specifies the Call interception Additional Network Feature (ANF), including its functional model and information flows, for engineers and organizations working with PISN signalling and service support.

What does SIST EN 301 256 V1.2.1:2005 specify?

SIST EN 301 256 V1.2.1:2005 is an endorsement of ISO/IEC 15053 (2003), modified for ETSI use. It sits in the PISN standards series, which uses ISDN concepts and the OSI framework, and it focuses on the Call interception ANF.

The document is organized as an endorsement notice for the International Standard rather than a full rewrite. The foreword identifies the standard family, the scope of the feature, the adoption route, and the transposition dates. Clause 3 then applies the ETSI modifications to the referenced documents and wording.

What are the key requirements of SIST EN 301 256 V1.2.1:2005?

The main substance of SIST EN 301 256 V1.2.1:2005 is that the elements of ISO/IEC 15053 (2003) apply, with specific ETSI modifications. In practice, implementers use the ISO/IEC feature definition, but they must follow the ETSI reference set and the ETSI wording rules.

• Clause 3 - reference handling rules. The document distinguishes specific and non-specific references. In practice, this tells readers whether later revisions of a cited document apply or whether the cited edition is fixed.
• Clause 3 - ETSI reference substitutions. Three original references are replaced by ETSI documents: EN 300 189, EN 300 171, and ETS 300 475-1. In practice, a conforming implementation must use those ETSI-linked documents instead of the original ISO/IEC references named in the table.
• Clause 3 - updated normative references. The added references cover addressing, circuit-mode 64 kbit/s bearer services, and PTN reference configuration. In practice, these are the supporting documents you consult when the call interception feature depends on numbering, bearer service, or network reference configuration.
• Clause 3 - terminology alignment. The text replaces "this International Standard" with "the present document". In practice, this keeps the ETSI edition consistent and avoids ambiguity about which document is being followed.
• Foreword - PISN service context. The standard belongs to the series defining services and signalling protocols for PISN. In practice, it is part of a larger service and protocol set, so interoperability work should be read in that context.

What terms does SIST EN 301 256 V1.2.1:2005 define?

PISN means Private Integrated Services Network, the network type covered by the standard.

ANF means Additional Network Feature, a defined network feature added to the base PISN service set.

Call interception is the feature addressed by the standard, meaning the network support for intercepting calls as specified by the document.

ISDN means Integrated Services Digital Network, the concept base used by the PISN series.

OSI means Open Systems Interconnection, the framework the series conforms to.

PTN means Private Telecommunication Network, the related network family named in the normative references.

PTNXs means PTN eXchanges, the reference configuration term used in the cited PTN document.

Who uses SIST EN 301 256 V1.2.1:2005?

SIST EN 301 256 V1.2.1:2005 is used by telecom engineers, signalling protocol designers, and equipment vendors working on PISN services. It is also relevant to network operators and enterprise telephony teams that need the call interception feature to be specified in a consistent, standard-based way.

Quality managers, conformity assessors, and buyers can use it to check whether a product or platform claims support for the PISN Call interception ANF in the ETSI-defined form. The document is also useful when comparing vendor implementations against a common reference for addressing, bearer services, and PTN configuration dependencies.

What changed in SIST EN 301 256 V1.2.1:2005 from the previous edition?

SIST EN 301 256 V1.2.1:2005 endorses ISO/IEC 15053 (2003) and applies ETSI-specific modifications. The stated changes are the insertion of three ETSI normative references in clause 3, the replacement of the corresponding original references throughout the text, and the replacement of "this International Standard" with "the present document".

Which standards are used with SIST EN 301 256 V1.2.1:2005?

• ETSI EN 300 189 - provides the PISN addressing reference used in place of ISO/IEC 11571.
• ETSI EN 300 171 - provides the circuit-mode 64 kbit/s bearer services reference used in place of ISO/IEC 11574.
• ETSI ETS 300 475-1 - provides the PTN reference configuration for PTN eXchanges used in place of ISO/IEC 11579-1.

These references matter because they define the supporting network behavior that the call interception feature relies on.

What does the SIST EN 301 256 V1.2.1:2005 document contain?

The document contains the ETSI endorsement notice for ISO/IEC 15053 (2003), the modified clause 3 reference handling, and the replacement table that maps the original ISO/IEC references to ETSI references. It also includes the foreword, transposition dates, IPR notice, copyright notice, and the publication history.

For a reader, that means the document shows how the International Standard is adopted into the ETSI/SIST environment and which companion documents must be used with it.