scope:

This Recommendation presents the signalling architecture of distributed ENUM networking in support of IMS interconnection. Based on a distributed framework of the ENUM server, this Recommendation specifies the signalling requirements for the functional entities, signalling procedures and protocols to be applied for interfaces, security considerations, etc.

NOTE 1 - This Recommendation defines the signalling architecture, signalling procedures and signalling requirements for a distributed ENUM model in support of IMS interconnection. The ENUM hierarchical model is addressed in [b-GSMA PRD IR.67] and [b-GSMA PRD NG.105].

NOTE 2 - The focus of this Recommendation is on infrastructure ENUM addressed in [b-IETF RFC 5067].

NOTE 3 - The national ITU-T E.164 numbering resource used in the distributed ENUM model is assigned by a national administration to the operator and should comply with all relevant national and international telecommunication regulatory, legal and licensing requirements.