Request For Comments storage
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Documents by A. van Wijk
2002, RFC3351:
User Requirements for the Session Initiation Protocol (SIP) in Support of Deaf, Hard of Hearing and Speech-impaired Individuals
2005, RFC4117:
Transcoding Services Invocation in the Session Initiation Protocol (SIP) Using Third Party Call Control (3pcc)
2008, RFC5194:
Framework for Real-Time Text over IP Using the Session Initiation Protocol (SIP)