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RFC 3261: “SIP: Session Initiation Protocol” RFC 3264: “An Offer/Answer Model with SDP” RFC 3263 “Locating SIP Servers” RFC 3840: “Indicating User Agent Capabilities in SIP” RFC 3856: “A Presence Event Package for SIP” RFC 3863 “Presence Information Data Format (PIDF)” RFC 3428: “SIP Extension for Instant Messaging” RFC 3994: “Indication of Message Composition for Instant Messaging” RFC 3581: “An Extension to SIP for Symmetric Response Routing” RFC xxxx: “Symmetric RTP and RTCP Considered Helpful” Mandatory References |