Overview
ISO/IEC 14136:1995 - "Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Specification, functional model and information flows - Identification supplementary services" - defines identification-related supplementary services for Private Integrated Services Networks (PISN). The standard specifies three services: Calling Line Identification Presentation (SS‑CLIP), Connected Line Identification Presentation (SS‑COLP) and Calling/Connected Line Identification Restriction (SS‑CLIR). It contains Stage 1 (user‑oriented) and Stage 2 (functional model and information flows) specifications to guide implementation and conformance.
Key Topics
- Service definitions
- SS‑CLIP: presents the calling user’s PISN number (and optionally subaddress) to the called user to enable return calls.
- SS‑COLP: presents the connected (called and answered) user’s PISN number to the calling user.
- SS‑CLIR: allows a user to restrict presentation of their PISN number to other users.
- Stage structure
- Stage 1: user-visible behaviour, invocation, provision/withdrawal, activation, and interaction with other supplementary services.
- Stage 2: functional entities, information flows, functional entity actions/behaviour, allocation to physical equipment and interworking considerations.
- Operational requirements
- SS‑CLIP is generally available and permanently activated; no per-user registration is required.
- Presentation includes numbering plan and type indicators and marks whether number was user‑provided or network‑provided.
- Conformance note
- A Stage 3 specification (signalling protocols and equipment behaviour) is required to claim full conformance for implementations that interact at signalling/equipment interfaces.
Applications
- Telecommunications equipment vendors implementing PISN exchanges (PINX) or terminal equipment that must support identification supplementary services.
- Network architects and PISN operators designing service profiles, privacy controls and interworking with public networks.
- Standards and protocol developers producing Stage 3 signalling specifications that map the Stage 1/Stage 2 functional model onto concrete signalling protocols.
- Enterprise telephony integrators and developers building PBX or private ISDN solutions that require caller/connected‑party identification and privacy features.
Related Standards
- ISO/IEC 11571 (Numbering and sub‑addressing in PISNs)
- ISO/IEC 11574 (PISN basic services - call control)
- ISO/IEC 11579‑1 (Reference configuration for PISN exchanges / PINX)
- CCITT / ITU‑T recommendations referenced in the standard (e.g., 1.112, 1.130)
ISO/IEC 14136:1995 is essential for anyone implementing or integrating PISN caller identification, connected‑party presentation and privacy controls, and for producing interoperable Stage 3 signalling protocols that realize these services.
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