RFC 6914: SIMPLE Made Simple: An Overview of the IETF Specifications for Instant Messaging and Presence Using the Session Initiation Protocol (SIP)
SIMPLE Made Simple: An Overview of the IETF Specifications for Instant Messaging and Presence Using the Session Initiation Protocol (SIP)
RFC 2026: The Internet Standards Process -- Revision 3
RFC 3261: SIP: Session Initiation Protocol
RFC 3265: Session Initiation Protocol (SIP)-Specific Event Notification
RFC 3320: Signaling Compression (SigComp)
RFC 3428: Session Initiation Protocol (SIP) Extension for Instant Messaging