Using the International Mobile station Equipment Identity (IMEI) Uniform Resource Name (URN) as an Instance ID, May 2014
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This specification defines how the Uniform Resource Name (URN) reserved for the Global System for Mobile Communications Association (GSMA) identities and its sub-namespace for the International Mobile station Equipment Identity (IMEI) can be used as an instance-id. Its purpose is to fulfill the requirements for defining how a specific URN needs to be constructed and used in the '+sip.instance' Contact header field parameter for outbound behavior.
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 8729.