SIP协议族

SIP/SIMPLE Industry Standards
The industry standards that describe the SIP/SIMPLE interface that is supported by Cisco Unified Presence are:  
RFC-3261 -- SIP: Session Initiation Protocol
RFC-3265 -- SIP-Specific Event Notification
RFC-3856 -- A Presence Event Package for SIP
RFC-3863 -- Presence Information Data Format (PIDF)
RFC-3903 -- SIP Extension for Event State Publication
RFC-4479 -- A Data Model for Presence
RFC-4480 -- RPID: Rich Presence: Extensions to the Presence Information Data Format (PIDF)
draft-ietf-simple-prescaps-ext-03 -- User Agent Capability Extension to Presence Information  Data Format (PIDF)
RFC-4662 -- A Session Initiation Protocol (SIP) Event Notification Extension for Resource Lists
draft-ietf-sip-subnot-etags-02 -- An Extension to Session Initiation Protocol (SIP) Events for  Conditional Event Notification
RFC-3428 -- Session Initiation Protocol (SIP) Extension for Instant Message

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