SIST EN 301 655 V1.1.1:2005

SIST EN 301 655 V1.1.1:2005 is the Slovenian adoption of ETSI EN 301 655 Version 1.1.1. It specifies the Call Priority Interruption and Call Priority Interruption Protection Supplementary Services for Private Integrated Services Network (PISN), using a functional model and information flows. Engineers, vendors, and quality teams use it to understand how these PISN call-control services are described and how the related references are aligned.

What does SIST EN 301 655 V1.1.1:2005 specify?

SIST EN 301 655 V1.1.1:2005 specifies the service definition for two PISN supplementary services: Call Priority Interruption and Call Priority Interruption Protection. It is an ETSI European Standard in the telecommunications series and it is presented as a modified European version of ISO/IEC 15991 (1998).

The document is organized as an EN adaptation of the ISO/IEC text. Clause 3 gives the normative references and the rules for reading them, while the body of the standard applies ETSI-specific modifications throughout the text.

What are the key requirements of SIST EN 301 655 V1.1.1:2005?

SIST EN 301 655 V1.1.1:2005 mainly tells the reader how the ISO/IEC service specification is to be used in the European context. The practical effect is that implementers and specifiers must follow the EN/ETS replacements and the reference rules stated in the modified text.

• The standard covers two supplementary services. The service names are Call Priority Interruption and Call Priority Interruption Protection. In practice, readers use the document to understand how these services are described for PISN behavior.
• Clause 3 replaces the reference-handling paragraph. It states how specific and non-specific references are treated. This matters because a specific reference freezes the cited edition, while a non-specific reference always points to the latest version.
• Clause 3 adds the European normative references. The added references include EN 300 171, EN 301 256, EN 301 657, ETS 300 256, ETS 300 258, ETS 300 260, ETS 300 365, ETS 300 387, and ETS 300 475-1. These provide the related PISN and PTN material needed to interpret the service specification.
• The original ISO/IEC references are replaced by ETSI equivalents throughout the text. For example, references to ISO/IEC 11574, 13863, 13865, 13866, 13872, 15053, 15430, and CCITT Recommendation I.130 are mapped to the listed EN or ETS documents. This keeps the service description consistent with European standards.
• The term “International Standard” is replaced by “EN”. This aligns the wording with the document status as a European Norm.
• The text marks modified passages. New or changed text is shown with sidebars, and underlining or strike-out is used where detailed modifications are needed. That helps readers see what differs from the ISO/IEC base text.
• The foreword places the standard in the PISN series. It says the series defines services and signalling protocols for PISN and uses ISDN concepts within the OSI framework. In practice, this tells readers the standard belongs to a broader family of service and signalling specifications.

What terms does SIST EN 301 655 V1.1.1:2005 define?

• PISN - Private Integrated Services Network, the network environment addressed by the standard.
• Supplementary services - Additional call-related services defined on top of the basic network service set.
• Call Priority Interruption - The service concerned with interrupting a call according to priority handling.
• Call Priority Interruption Protection - The service concerned with protecting a call from interruption.
• Functional model - The way the service is structured into roles and behavior.
• Information flows - The signalling exchanges that carry the service behavior between network entities.
• ISDN - Integrated Services Digital Network, the concept family referenced by the foreword.
• OSI - Open Systems Interconnection, the framework named for the standard's alignment.

Who uses SIST EN 301 655 V1.1.1:2005?

SIST EN 301 655 V1.1.1:2005 is used by telecommunications engineers, equipment vendors, standards specialists, and quality teams working with PISN. It is also relevant to organizations that need to map ISO/IEC service descriptions to EN and ETSI references. Typical tasks include service specification, protocol interpretation, interoperability work, and document review for private-network telephony systems.

What changed in SIST EN 301 655 V1.1.1:2005 from the previous edition?

SIST EN 301 655 V1.1.1:2005 is a modified European version of ISO/IEC 15991 (1998). The changes stated in the document are the ETSI-specific modifications, the insertion of European normative references, the replacement of selected ISO/IEC and CCITT references with EN and ETS documents, and the replacement of the term “International Standard” with “EN”.

Which standards are used with SIST EN 301 655 V1.1.1:2005?

The document's clause 3 names the following references and shows what each contributes:

• EN 300 171 - Control aspects of circuit-mode basic services.
• EN 301 256 - Call interception additional network feature.
• EN 301 657 - Call handling additional network feature.
• ETS 300 256 - Diversion supplementary services.
• ETS 300 258 - Path replacement additional network feature.
• ETS 300 260 - Call transfer supplementary services.
• ETS 300 365 - Call completion supplementary services.
• ETS 300 387 - Method for the specification of basic and supplementary services.
• ETS 300 475-1 - Reference configuration for PTN eXchanges.

What does the SIST EN 301 655 V1.1.1:2005 document contain?

The document contains the front matter, the foreword, the IPR notice, the national transposition information, clause 3 with its modified normative reference text, and the reference replacement table used throughout the ISO/IEC text. It also includes the history block showing the publication trail. The main tabular content is the mapping of ISO/IEC and CCITT references to their EN and ETS equivalents, which helps readers apply the correct European documents when implementing or checking the service specification.