ISO/IEC 21888:2001 PDF

Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Specification, functional model and information flows — Call Identification and Call Linkage Additional Network Feature

First page of standard ISO/IEC 21888:2001

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Title (English):

ISO/IEC 21888:2001

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 16
Publication date:: September 13, 2001
Edition:: ISO/IEC IS 21888 edition 1 version 1
ICS:: 33.040.35

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Description (English):

This International Standard specifies the Additional Network Feature (ANF) Call Identification and Call Linkage (CIDL), which is applicable to various basic services supported by Private Integrated Services Networks (PISN). Basic services are specified in ISO/IEC 11574. ANF-CIDL is an additional network feature which allows the identification and correlation of calls throughout a PISN by assigning unambiguous identifiers to each new call and also, as an option, to transformed and logically linked calls. NOTE 1 - This ANF has been developed to support the use of CSTA (ISO/IEC 18051) in a networked environment, i.e. in a PISN. Use of this ANF for other applications is not precluded. Supplementary service specifications are produced in three stages, according to the method described in ETS 300 387. This International Standard contains the stage 1 and stage 2 specifications of ANF-CIDL. The stage 1 specification (clause 6) specifies the general feature principles and capabilities. The stage 2 specification (clause 7) identifies the Functional Entities involved in the supplementary service and the information flows between them.

Technical details

Technical committee: ISO/IEC JTC 1/SC 6 - Telecommunications and information exchange between systems
SKU: ISO/IEC 21888:2001

Abstract

Overview

ISO/IEC 21888:2001 specifies the Call Identification and Call Linkage (ANF‑CIDL) Additional Network Feature for Private Integrated Services Networks (PISN). The standard defines how unambiguous identifiers are assigned and propagated so calls can be identified and correlated end‑to‑end across a PISN. It contains the stage 1 (general feature principles and capabilities) and stage 2 (functional model and information flows) specifications required to support networked Computer Supported Telecommunications Applications (CSTA, ISO/IEC 18051) and other applications that need reliable call correlation.

Key topics and technical requirements

Scope: Applies to basic services in PISN (see ISO/IEC 11574) and to calls or call‑independent signalling connections.
Identifiers defined:
- Global Call ID (GID) - unique end‑to‑end identifier for a call; updated when calls are transformed into a new call.
- Leg ID (LID) - identifier assigned to a call leg that remains unchanged during that leg’s lifetime.
- Thread ID (TID) - optional identifier for logically linked calls to correlate related call threads.
Stage 1 (Clause 6): General feature principles, provisioning, normal/exceptional procedures, and interactions with other supplementary services (e.g., call transfer, call forwarding, call interception, wireless terminal features).
Stage 2 (Clause 7): Functional model (functional entities, FE1/FE2/FE3), information flows, functional entity actions and behaviours, and allocation of functional entities to physical equipment.
Conformance: A stage 3 specification (not contained here) is required to define signalling protocols and equipment behaviour for claiming conformance in an actual PISN deployment.
Interworking considerations: Describes how ANF‑CIDL interacts with other ANFs and supplementary services and supports CSTA in a networked environment.

Applications and who uses it

Telecom equipment vendors implementing PISN exchanges and private branch exchange (PBX) features.
Network architects and integrators designing call tracking, monitoring, billing, and troubleshooting systems that require reliable call correlation.
Developers of CSTA‑based applications and CTI (computer telephony integration) solutions that operate across distributed PISN environments.
Service providers deploying advanced call‑control features (call transfer, forwarding, interception, wireless terminal services) that require consistent call identifiers.

Related standards

ISO/IEC 11574 - Basic call services (PISN)
ISO/IEC 18051 - CSTA Phase III (services for computer supported telecommunications applications)
ISO/IEC 11579‑1 - PISN reference configuration (PINX)
ETS 300 387 - Method for specification of basic and supplementary services

Keywords: ISO/IEC 21888:2001, ANF‑CIDL, Call Identification, Call Linkage, PISN, Global Call ID, Leg ID, Thread ID, CSTA, functional model, information flows.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and technical requirements

Scope: Applies to basic services in PISN (see ISO/IEC 11574) and to calls or call‑independent signalling connections.
Identifiers defined:
- Global Call ID (GID) - unique end‑to‑end identifier for a call; updated when calls are transformed into a new call.
- Leg ID (LID) - identifier assigned to a call leg that remains unchanged during that leg’s lifetime.
- Thread ID (TID) - optional identifier for logically linked calls to correlate related call threads.
Stage 1 (Clause 6): General feature principles, provisioning, normal/exceptional procedures, and interactions with other supplementary services (e.g., call transfer, call forwarding, call interception, wireless terminal features).
Stage 2 (Clause 7): Functional model (functional entities, FE1/FE2/FE3), information flows, functional entity actions and behaviours, and allocation of functional entities to physical equipment.
Conformance: A stage 3 specification (not contained here) is required to define signalling protocols and equipment behaviour for claiming conformance in an actual PISN deployment.
Interworking considerations: Describes how ANF‑CIDL interacts with other ANFs and supplementary services and supports CSTA in a networked environment.

Applications and who uses it

Telecom equipment vendors implementing PISN exchanges and private branch exchange (PBX) features.
Network architects and integrators designing call tracking, monitoring, billing, and troubleshooting systems that require reliable call correlation.
Developers of CSTA‑based applications and CTI (computer telephony integration) solutions that operate across distributed PISN environments.
Service providers deploying advanced call‑control features (call transfer, forwarding, interception, wireless terminal services) that require consistent call identifiers.

Related standards

ISO/IEC 11574 - Basic call services (PISN)
ISO/IEC 18051 - CSTA Phase III (services for computer supported telecommunications applications)
ISO/IEC 11579‑1 - PISN reference configuration (PINX)
ETS 300 387 - Method for specification of basic and supplementary services

Keywords: ISO/IEC 21888:2001, ANF‑CIDL, Call Identification, Call Linkage, PISN, Global Call ID, Leg ID, Thread ID, CSTA, functional model, information flows.

ISO/IEC 21888:2001 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

Services for Computer Supported Telecommunications Applications (CSTA) Phase III [ISO/IEC 18051 (2000), modif…

Private Integrated Services Network (PISN); Specification, functional models and information flows; Control a…

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