ISO/IEC 15771:1998 PDF

Overview

ISO/IEC 15771:1998 specifies the Common Information Additional Network Feature (ANF‑CMN) for Private Integrated Services Networks (PISN). The standard defines how miscellaneous information about a calling or called party-such as Feature Identifiers, Party Category, and Equipment Identity-is exchanged between entities acting on behalf of the two ends of a connection. ISO/IEC 15771:1998 contains the stage 1 (user view) and stage 2 (functional model and information flows) specifications. Stage 3 (signalling protocols) is out of scope and must be provided by implementation standards to claim conformance.

Key topics and requirements

• Purpose: enable exchange of Common Information within PISNs to support user indications, inter-network exchange, or feature request filtering.
• Stage 1 (Clause 6): user-facing description-how ANF‑CMN appears to users and service behaviour (provision/withdrawal, normal and exceptional procedures).
• Stage 2 (Clause 7): functional entities, functional model, and detailed information flows between entities (definition, sequences, and mapping to basic call flows).
• Common Information elements: Feature Identifiers, Party Category, Equipment Identity, plus other miscellaneous user/equipment attributes.
• Inter-service interactions: specifies interaction behaviour with supplementary services and features (examples include CLIP, COLP, CLIR, CNIP, call forwarding variants, MWI, mobility and authentication features).
• Conformance requirement: a stage 3 specification must define signalling protocols and equipment behaviour adequate to support the stage 1 and stage 2 aspects relevant to the interface or equipment.

Practical applications and users

Who benefits from ISO/IEC 15771:1998:

• Telecom equipment manufacturers implementing PISN exchanges (PINX) and endpoint devices.
• Network architects and solution designers building enterprise PISNs or private ISDN-like networks.
• Protocol designers producing stage 3 signalling specifications that carry ANF‑CMN information across interfaces.
• Test labs and conformance bodies verifying PISN feature compliance. Practical uses:
• Passing equipment identity and party-category data to enable tailored user indications or billing logic.
• Filtering or authorizing supplementary-service requests based on received Common Information.
• Supporting advanced call handling and interworking within enterprise telephony systems.

Related standards

• ISO/IEC 11574: Basic services for PISN (service descriptions).
• ISO/IEC 11579‑1: Reference configuration for PISN exchanges (PINX).
• ITU‑T Rec. I.130 / I.210 / I.112, Z.100: Service characterization, vocabulary, and SDL modelling referenced for method and terminology.

This standard is essential when designing interoperable PISN services that require structured exchange of user/equipment attributes across network functional entities.