Telecommunications Relay Service Purpose for the Call-Info Header Field in the Session Initiation Protocol (SIP)

Document Type Expired Internet-Draft (individual)
Author Paul Kyzivat 
Last updated 2015-07-24 (latest revision 2015-01-20)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document defines and registers a value of "original-identity" for the "purpose" header field parameter of the Call-Info header field in the Session Initiation Protocol (SIP).


Paul Kyzivat (

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