ISO/IEC 15051:2003 PDF

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

First page of standard ISO/IEC 15051:2003

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Title (English):

ISO/IEC 15051:2003

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 14
Publication date:: March 21, 2003
Edition:: ISO/IEC IS 15051 edition 2 version 1
ICS:: 33.040.35

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Description (English):

ISO/IEC 15051:2003 specifies supplementary service Recall (SS-RE), which is applicable to various basic services supported by Private Integrated Services Networks (PISN). Basic services are specified in ISO/IEC 11574. SS-RE is a supplementary service which provides for the redirection of a call transferred by the served user back to the served user if the call is unanswered. SS-RE is only applicable after transfer by join, not after transfer by rerouteing. Service specifications are produced in three stages, according to the method described in ETS 300 387. ISO/IEC 15051:2003 contains the stage 1 and stage 2 specifications of SS-RE. The stage 1 specification (clause 6) specifies the supplementary service as seen by users of PISNs. 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 15051:2003

Abstract

Overview

ISO/IEC 15051:2003 defines the Recall supplementary service (SS-RE) for Private Integrated Services Networks (PISN). The standard contains the Stage 1 (service description as seen by users) and Stage 2 (functional model and information flows) specifications. SS-RE provides for the redirection of a call that was transferred by a served user back to that served user if the transferred call is unanswered - either because the transfer target is busy (Recall busy) or does not answer while alerting (Recall no answer). SS-RE applies to basic services specified in ISO/IEC 11574 and is applicable only after transfer by join, not after transfer by rerouting.

Key Topics and Requirements

Service scope: SS-RE is a supplementary service for PISNs and complements basic call services defined in ISO/IEC 11574.
Variants: Two implementation options - Recall busy (redirect when transfer target remains busy) and Recall no answer (redirect when transfer target does not answer). Implementations may support one or both.
Timers: The standard defines recall busy timer and recall no answer timer (values are implementation-specific) to govern waiting and alerting periods before recall occurs.
Invocation rules: SS-RE may be invoked by the PISN automatically at transfer time when the secondary call is not active. If the target answers within the timer period, SS-RE is cancelled.
Notifications and identity presentation: When recall occurs the served user and the transferring user (user B) are notified; presentation of caller identity follows interactions with CLIP/COLP/CLIR/CNIP/CNIR rules (presentation may be restricted or overridden).
Interactions and exceptions: The standard specifies interactions with other supplementary services (e.g., SS-CFU, SS-CFB) and exceptional behaviors if redirection fails (options are implementation-dependent).
Stage 2 artifacts: Functional entities (FEs) and defined information flows identify how the service is realized within a PISN architecture.

Applications and Who Uses It

Telephony/PBX and PISN equipment manufacturers implementing call transfer and recall features.
Telecom system architects and integrators designing PISN/PINX solutions that need standardized supplementary services.
Standards developers producing Stage 3 (protocol-level) specifications and implementers of signaling protocols.
Enterprise communications administrators requiring predictable call transfer/recall behavior in private networks.

Related Standards

ISO/IEC 11574 (basic services / functional capabilities)
ISO/IEC 11579-1 (PINX reference configuration)
ISO/IEC 13865 (Call Transfer supplementary service)
ETS 300 387 (service specification method) and relevant ITU‑T recommendations (I.112, I.210, I.221, Z.100)

Keywords: ISO/IEC 15051:2003, SS-RE, Recall supplementary service, PISN, Private Integrated Services Network, call transfer, recall no answer, recall busy, functional model, information flows.

Related standards

Standards mentioned in the description

Abstract

Overview

Key Topics and Requirements

Service scope: SS-RE is a supplementary service for PISNs and complements basic call services defined in ISO/IEC 11574.
Variants: Two implementation options - Recall busy (redirect when transfer target remains busy) and Recall no answer (redirect when transfer target does not answer). Implementations may support one or both.
Timers: The standard defines recall busy timer and recall no answer timer (values are implementation-specific) to govern waiting and alerting periods before recall occurs.
Invocation rules: SS-RE may be invoked by the PISN automatically at transfer time when the secondary call is not active. If the target answers within the timer period, SS-RE is cancelled.
Notifications and identity presentation: When recall occurs the served user and the transferring user (user B) are notified; presentation of caller identity follows interactions with CLIP/COLP/CLIR/CNIP/CNIR rules (presentation may be restricted or overridden).
Interactions and exceptions: The standard specifies interactions with other supplementary services (e.g., SS-CFU, SS-CFB) and exceptional behaviors if redirection fails (options are implementation-dependent).
Stage 2 artifacts: Functional entities (FEs) and defined information flows identify how the service is realized within a PISN architecture.

Applications and Who Uses It

Telephony/PBX and PISN equipment manufacturers implementing call transfer and recall features.
Telecom system architects and integrators designing PISN/PINX solutions that need standardized supplementary services.
Standards developers producing Stage 3 (protocol-level) specifications and implementers of signaling protocols.
Enterprise communications administrators requiring predictable call transfer/recall behavior in private networks.

Related Standards

ISO/IEC 11574 (basic services / functional capabilities)
ISO/IEC 11579-1 (PINX reference configuration)
ISO/IEC 13865 (Call Transfer supplementary service)
ETS 300 387 (service specification method) and relevant ITU‑T recommendations (I.112, I.210, I.221, Z.100)

Keywords: ISO/IEC 15051:2003, SS-RE, Recall supplementary service, PISN, Private Integrated Services Network, call transfer, recall no answer, recall busy, functional model, information flows.

ISO/IEC 15051:2003 PDF

Technical details

Abstract

Overview

Key Topics and Requirements

Applications and Who Uses It

Related Standards

Related standards

Abstract

Overview

Key Topics and Requirements

Applications and Who Uses It

Related Standards

Related standards

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