This document describes an extension to the Session Initiation Protocol (SIP) for publishing event state used within the SIP Events framework. The first application of this extension is for the publication of presence information. The mechanism described in this document can be extended to support publication of any event state for which there exists an appropriate event package. It is not intended to be a general-purpose mechanism for transport of arbitrary data@ as there are better-suited mechanisms for this purpose.
RFC 3903-2004 history
2004RFC 3903-2004 Session Initiation Protocol (SIP) Extension for Event State Publication