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RFC 2327: SDP: Session Description Protocol
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RFC 2833: RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals
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RFC 2976: The SIP INFO Method
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RFC 3261: SIP: Session Initiation Protocol
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RFC 3262: Reliability of Provisional Responses in the Session Initiation Protocol (SIP)
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RFC 3264: An Offer/Answer Model with the Session Description Protocol (SDP)
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RFC 3265: Session Initiation Protocol (SIP)-Specific Event Notification
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RFC 3311: The Session Initiation Protocol (SIP) UPDATE Method
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RFC 3323: A Privacy Mechanism for the Session Initiation Protocol (SIP)
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RFC 3325: Private Extensions to the Session Initiation Protocol (SIP) for Asserted Identity within Trusted Networks
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RFC 3515: The Session Initiation Protocol (SIP) Refer Method
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RFC 3581: An Extension to the Session Initiation Protocol (SIP) for Symmetric Response Routing
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RFC 3605: Real Time Control Protocol (RTCP) attribute in Session Description Protocol (SDP)
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RFC 3711: The Secure Real-time Transport Protocol (SRTP)
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RFC 3842: A Message Summary and Message Waiting Indication Event Package for the Session Initiation Protocol (SIP)
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RFC 3891: The Session Initiation Protocol (SIP) "Replaces" Header
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RFC 3892: The Session Initiation Protocol (SIP) Referred-By Mechanism
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RFC 4028: Session Timers in the Session Initiation Protocol (SIP)
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RFC 4235: An INVITE-Initiated Dialog Event Package for the Session Initiation Protocol (SIP)
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RFC 4568: Session Description Protocol (SDP) Security Descriptions for Media Streams
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RFC 4916: Connected Identity in the Session Initiation Protocol (SIP)
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RFC 5389: Session Traversal Utilities for NAT (STUN)
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RFC 5626: Managing Client-Initiated Connections in the Session Initiation Protocol (SIP)
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RFC 5763: Framework for Establishing a Secure Real-time Transport Protocol (SRTP)
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RFC 5761: Multiplexing RTP Data and Control Packets on a Single Port
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RFC 5806: Diversion Indication in SIP
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RFC 6189: ZRTP: Media Path Key Agreement for Unicast Secure RTP
