Supporting Globally Routable User Agent URI in IMS; Report and conclusions
The present document is a temporary container for the architectural impacts on IM CN subsystem for supporting GRUU. The contents of this report when stable will be the base for CRs to 3GPP Technical Specifications e.g. TS 23.228 [2].
GRUU is a URI, the creation and use of which is defined in an IETF specification draft-ietf-sip-gruu-0 [1] in order to route SIP messages to a specific SIP User Agent (UA) instance. The support of GRUU in IMS is to enable routing of SIP messages to a specific instance of a registered public user identity even when a single public user id is registered from multiple UEs.