ISO/IEC 17877:2000 PDF

Overview

ISO/IEC 17877:2000 defines call-handling additional network features for Private User Mobility (PUM) in Private Integrated Services Networks (PISN). The standard specifies two ANFs:

• ANF‑PUMI (Incoming Call): directs incoming calls to a PUM user anywhere within a PISN if the user's current location is known.
• ANF‑PUMO (Outgoing Call): allows a PUM user’s outgoing call to be processed at the user’s home location when required.

This International Standard contains the stage 1 (general principles and capabilities - clauses 6 and 7) and stage 2 (functional model and information flows - clauses 8 and 9) specifications. Stage 3 (signalling protocols and equipment behaviour) is required for formal conformance.

Key Topics

• Functional model and FEs: stage 2 identifies Functional Entities (FEs) involved in PUMI and PUMO and how they map to physical equipment (e.g., Home PINX, Visitor PINX, Home Data Base (HDB), Visitor Data Base (VDB)).
• Information flows: definitions and sequences for information exchange needed to locate users and route calls correctly within a PISN.
• Service definitions: clear definitions for PUM concepts-PUM registration, PUM user identity (PISN number or alternative identifier), hosting address, incoming/outgoing PUM call.
• Interactions with other services: specifies how PUMI/PUMO interact with supplementary services such as CLIP/ COLP/ CLIR, Call Forwarding (CFU/CFB/CFNR), Call Transfer, Message Waiting Indication (MWI) and more.
• Conformance model: to claim conformance, stage 3 specifications must implement signalling and equipment behaviour adequate to support the stage 1 and 2 features described.

Applications

ISO/IEC 17877 is practical for organizations designing, deploying or testing private telecommunication networks where users may move between terminals:

• PISN equipment manufacturers - to design switches, PINX devices, and databases that support PUM features.
• Enterprise network architects and operators - to enable seamless call continuity for roaming employees across a private network.
• Protocol and signalling engineers - to map stage 2 functional models into stage 3 signalling protocols and implementations.
• Test labs and certification bodies - to validate functional conformance of PUM features against stage 1/2 requirements.

Deploying PUMI and PUMO improves user mobility, consistent call routing, and centralized policy control in campus, corporate or carrier-managed private networks.

Related Standards

Key referenced documents include:

• ISO/IEC 11574 (basic call services and functional capabilities)
• ISO/IEC 11571 (PISN addressing)
• ISO/IEC 11579‑1 (PISN exchange reference configuration)
• ISO/IEC 17875 (PUM registration supplementary service)

Keywords: ISO/IEC 17877, Private User Mobility, PUMI, PUMO, PISN, ANF, functional model, information flows, Home PINX, Home Data Base, visitor database.