8 Addressing requirements

22.3403GPPIP Multimedia Subsystem (IMS) messagingStage 1TS

It shall be possible to use a single address to identify the recipient. The single address shall be either a SIP URL, a network address identifier (NAI as defined in RFC2486 [3]) or a MSISDN.

IMS Messaging shall be based on existing IMS address resolution and routing mechanisms.