Overview
ISO/IEC TR 12861:2009 - "Information technology - Telecommunications and information exchange between systems - Next Generation Corporate Networks (NGCN) - Identification and routing" - is a technical report that examines user identification and routing for IP-based enterprise communications. It focuses on session-level, real‑time services (voice, video, real‑time text, instant messaging) using SIP and addresses inter-domain scenarios: within an enterprise, between enterprises, and between enterprises and carriers/NGNs.
Key topics and requirements
- User identifiers (AoRs): types and semantics of SIP/SIPS/TEL URIs, including number‑based SIP URIs, email‑style SIP URIs and the role of E.164 telephone numbers.
- Identifier variants: distinctions between home and transient number‑based SIP URIs, device identifiers, service identifiers and dial strings.
- Routing principles: general routing to enterprise domains, routing to the home server (registrar/proxy), and roaming/roaming‑hub considerations.
- Identity delivery and protection: mechanisms and requirements for delivering calling/called identities, authenticity, privacy and restriction of identification information.
- Interoperability & gaps: summary of requirements on NGNs and enterprise networks and identification of standardisation gaps to guide further work.
- Normative references include RFC 3261 (SIP), RFC 3966 (tel URI), ENUM (RFC 3761) and related SIP identity/authentication drafts.
Practical applications
This report is practical guidance for:
- Enterprise network architects designing Next Generation Corporate Networks (NGCNs) and SIP-based telephony.
- Service providers and NGN operators implementing hosted enterprise services and inter-domain routing.
- VoIP / UC vendors implementing identifier handling, SIP routing, registration and privacy features.
- Standards bodies and integrators aligning enterprise SIP deployments with public numbering (E.164/ENUM) and roaming models.
Common use cases include managing corporate directory identities, mapping telephone numbers to SIP URIs, defining routing policies to reach home servers, and ensuring authenticated identity exchange across trusted domains.
Related standards
- ISO/IEC TR 12860:2009 (NGCN - General)
- IETF RFC 3261 (SIP), RFC 3966 (tel URI), RFC 3761 (ENUM)
- RFCs addressing SIP identity and privacy (e.g., RFC 3323, RFC 4474) and drafts such as GRUU
ISO/IEC TR 12861:2009 is a pragmatic companion for anyone implementing or standardizing SIP‑based enterprise communications who needs clear guidance on identification, routing and interoperability between enterprise and public next‑generation networks.