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Documents by A. Allen
2007, RFC4964:
The P-Answer-State Header Extension to the Session Initiation Protocol for the Open Mobile Alliance Push to Talk over Cellular
2008, RFC5373:
Requesting Answering Modes for the Session Initiation Protocol (SIP)
2014, RFC7254:
A Uniform Resource Name Namespace for the Global System for Mobile Communications Association (GSMA) and the International Mobile station Equipment Identity (IMEI)
2014, RFC7255:
Using the International Mobile station Equipment Identity (IMEI) Uniform Resource Name (URN) as an Instance ID