ISO/IEC 17876:2003 PDF

Overview

ISO/IEC 17876:2003 defines the signalling protocol for the Private User Mobility Registration supplementary service (SS‑PUMR) used in Private Integrated Services Networks (PISNs). It is the Stage 3 (protocol) specification for the Q reference point between Private Integrated services Network eXchanges (PINXs) and implements the registration, de‑registration and interrogation procedures that let a Private User Mobility (PUM) user move between wired and wireless terminals while retaining service (making/receiving calls).

Keywords: ISO/IEC 17876:2003, SS‑PUMR, Private User Mobility, PISN, PINX, Q reference point, signalling protocol

Key topics and technical requirements

• Scope and conformance: Protocol for SS‑PUMR at the Q reference point; conformance assessed via the PICS proforma (Annex A).
• Registration modes: InCall registration (mandatory), OutCall and AllCall registrations (optional) - enabling incoming, outgoing or both types of call service mobility.
• Procedures and states: Detailed signalling procedures for registration, de‑registration and interrogation across Visitor, Home, Previous Visitor, Transit and Directory PINXs.
• Protocol building blocks: Uses generic supplementary‑service control procedures from ISO/IEC 11582 and follows ITU‑T I.130 service staging.
• Interactions: Specifies protocol interactions at the Q point between SS‑PUMR and other supplementary services and Additional Network Features (ANFs), e.g., call forwarding, message waiting indication, wireless terminal features.
• Technical artifacts: Includes timers (T1–T5), ASN.1 definitions, SDL representations, message sequence examples and PICS - supporting implementation, testing and conformance.

Keywords: signalling procedures, ASN.1, SDL, PICS, supplementary services, ANF

Applications and who uses it

• Telecom equipment vendors implementing PINX/PISN exchange software for enterprise telephony and private networks.
• System integrators and service providers deploying private branch exchanges and unified communications where user mobility across wired/wireless endpoints is required.
• Test labs and QA teams validating SS‑PUMR signalling conformance using the PICS, message sequences and ASN.1 artifacts included in the standard.
• Standards and interoperability engineers ensuring correct interactions between mobility services and other supplementary services at the Q reference point.

Keywords: enterprise telephony, private branch exchange, interoperability, conformance testing

Related standards

• ISO/IEC 17875 (stage 1/2 service specification for PUM)
• ISO/IEC 11582 (generic protocol for supplementary services)
• ISO/IEC 11579‑1 (PINX reference configuration)
• Relevant ITU‑T recommendations: I.130, Q.950, Z.100

Keywords: ISO/IEC 17875, ISO/IEC 11582, ITU‑T I.130

This concise summary helps implementers and decision‑makers understand ISO/IEC 17876:2003’s role in enabling private user mobility through standardized inter‑exchange signalling in PISNs.