ISO/IEC 13865:2003 PDF

Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Specification, functional model and information flows — Call Transfer supplementary service

First page of standard ISO/IEC 13865:2003

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Title (English):

ISO/IEC 13865:2003

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 34
Publication date:: March 24, 2003
Edition:: ISO/IEC IS 13865 edition 2 version 1
ICS:: 33.040.35

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Description (English):

ISO/IEC 13865:2003 specifies Supplementary Service Call Transfer (SS-CT), which is applicable to various basic services supported by Private Integrated Services Networks (PISNs). Basic services are specified in ISO/IEC 11574. SS-CT is a supplementary service which enables a user to transform two of that user's calls (of which one must be answered) into a new call between the other two users of the two calls. Supplementary service specifications are produced in three stages, according to the method described in ETS 300 387. ISO/IEC 13865:2003 contains the stage 1 and stage 2 specifications of SS-CT. The stage 1 specification (clause 6) specifies the supplementary service as seen by users of PISNs. The stage 2 specification (clauses 7 and 8) identifies the functional entities involved in the supplementary service and the information flows between them. ISO/IEC 13865:2003 contains two stage 2 specifications reflecting different ways of operating the service within the network: transfer by join and transfer by rerouteing.

Technical details

Technical committee: ISO/IEC JTC 1/SC 6 - Telecommunications and information exchange between systems
SKU: ISO/IEC 13865:2003

Abstract

Overview

ISO/IEC 13865:2003 - "Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Call Transfer supplementary service (SS-CT)" - defines the Call Transfer supplementary service for Private Integrated Services Networks (PISNs). The standard contains the Stage 1 (user-level) and Stage 2 (functional model and information flows) specifications for SS-CT and gives two network operation methods: transfer by join and transfer by rerouteing. It is intended as the normative foundation for later Stage 3 signalling and protocol specifications.

Key topics and technical requirements

Service semantics (Stage 1):
- SS-CT allows a served user (User A) to transform two of their calls into a direct call between the other parties (User B and User C). At least one of the two calls must be answered.
- Both calls may be incoming or outgoing; the standard assumes both calls are already established when transfer is requested.
- The transfer result is a new B–C call; original connections to A are released.
Operational constraints:
- Transfer only accepted when valid call identities and compatibility conditions are met.
- Bearer capability compatibility rules are specified (e.g., same bearer capability, or Speech vs. 3.1 kHz audio interworking).
- Network must prevent illegal connections (e.g., Closed User Group restrictions).
- Support for subaddress exchange and presentation/restriction interactions (CLI/COLP/CNIP etc.) is addressed.
Functional model and information flows (Stage 2):
- Identifies functional entities (FEs) and inter‑FE relationships required to effect transfer.
- Provides information flow definitions and examples for transfer by join and transfer by rerouteing.
Conformance note:
- To claim conformance, a Stage 3 specification (signalling protocols and equipment behaviour) must support the Stage 1 and Stage 2 aspects applicable to the interface/equipment.

Applications and who uses it

Telecom equipment vendors and firmware developers implementing PISN/PINX features.
Standards engineers producing Stage 3 signalling protocols that enable call transfer in private networks.
Network architects and PISN operators who need to ensure feature compatibility, lawful restrictions (CUG), and correct functional allocation.
System integrators and VoIP gateway vendors working on interworking between ISDN and non‑ISDN endpoints where call transfer semantics must be preserved.

Related standards

ISO/IEC 11574 - Basic call services for PISN
ISO/IEC 11579-1 - PINX reference configuration
ETS 300 387 - Method for specification of basic and supplementary services
ISO/IEC 13864, ISO/IEC 14136 - Related identification/name supplementary service standards
ITU‑T Recs I.112, I.210 and Z.100 - Vocabulary, service principles and SDL

Keywords: ISO/IEC 13865:2003, SS-CT, Call Transfer supplementary service, PISN, PINX, transfer by join, transfer by rerouteing, functional model, information flows, ISO/IEC 11574.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and technical requirements

Service semantics (Stage 1):
- SS-CT allows a served user (User A) to transform two of their calls into a direct call between the other parties (User B and User C). At least one of the two calls must be answered.
- Both calls may be incoming or outgoing; the standard assumes both calls are already established when transfer is requested.
- The transfer result is a new B–C call; original connections to A are released.
Operational constraints:
- Transfer only accepted when valid call identities and compatibility conditions are met.
- Bearer capability compatibility rules are specified (e.g., same bearer capability, or Speech vs. 3.1 kHz audio interworking).
- Network must prevent illegal connections (e.g., Closed User Group restrictions).
- Support for subaddress exchange and presentation/restriction interactions (CLI/COLP/CNIP etc.) is addressed.
Functional model and information flows (Stage 2):
- Identifies functional entities (FEs) and inter‑FE relationships required to effect transfer.
- Provides information flow definitions and examples for transfer by join and transfer by rerouteing.
Conformance note:
- To claim conformance, a Stage 3 specification (signalling protocols and equipment behaviour) must support the Stage 1 and Stage 2 aspects applicable to the interface/equipment.

Applications and who uses it

Telecom equipment vendors and firmware developers implementing PISN/PINX features.
Standards engineers producing Stage 3 signalling protocols that enable call transfer in private networks.
Network architects and PISN operators who need to ensure feature compatibility, lawful restrictions (CUG), and correct functional allocation.
System integrators and VoIP gateway vendors working on interworking between ISDN and non‑ISDN endpoints where call transfer semantics must be preserved.

Related standards

ISO/IEC 11574 - Basic call services for PISN
ISO/IEC 11579-1 - PINX reference configuration
ETS 300 387 - Method for specification of basic and supplementary services
ISO/IEC 13864, ISO/IEC 14136 - Related identification/name supplementary service standards
ITU‑T Recs I.112, I.210 and Z.100 - Vocabulary, service principles and SDL

Keywords: ISO/IEC 13865:2003, SS-CT, Call Transfer supplementary service, PISN, PINX, transfer by join, transfer by rerouteing, functional model, information flows, ISO/IEC 11574.

ISO/IEC 13865:2003 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Applications and who uses it

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Applications and who uses it

Related standards

Related standards

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