| SIP Release Notes | 2. Supported Features |
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| RFC Number | RFC Title |
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| RFC 3578 | Interworking of ISDN overlap signalling to SIP |
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| RFC 3581 | Symmetric Response Routing - rport |
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| RFC 3605 | RTCP attribute in SDP |
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| RFC 3608 | SIP Extension Header Field for Service Route Discovery During Registration |
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| RFC 3611 | RTP Control Protocol Extended Reports (RTCP XR) |
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| RFC 3665 | SIP Basic Call Flow Examples |
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| RFC 3666 | SIP to PSTN Call Flows |
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| RFC 3680 | A SIP Event Package for Registration (IMS) |
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| RFC 3711 | The Secure |
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| RFC 3725 | Third Party Call Control |
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| RFC 3824 | Using E.164 numbers with SIP (ENUM) |
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| RFC 3842 | MWI |
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| RFC 3891 | "Replaces" Header |
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| RFC 3892 | The SIP |
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| RFC 3903 | SIP Extension for Event State Publication |
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| RFC 3911 | The SIP Join Header [Partial] |
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| RFC 3959 | The Early Disposition Type for SIP |
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| RFC 3960 | Early Media and Ringing Tone Generation in SIP (partial compliance) |
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| RFC 3966 | The tel URI for Telephone Numbers |
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| RFC 4028 | Session Timers in the Session Initiation Protocol |
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| RFC 4040 | RTP Payload Format for a 64 kbit/s Transparent Call - Clearmode |
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| RFC 4117 | Transcoding Services Invocation |
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| RFC 4235 | An |
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| RFC 4240 | Basic Network Media Services with SIP - NetAnn |
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| RFC 4244 | An Extension to SIP for Request History Information |
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| RFC 4320 | Actions Addressing Identified Issues with SIP |
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| RFC 4321 | Problems Identified Associated with SIP |
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| RFC 4411 | Extending SIP Reason Header for Preemption Events |
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| RFC 4412 | Communications Resource Priority for SIP |
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| RFC 4458 | SIP URIs for Applications such as Voicemail and Interactive Voice Response |
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| RFC 4475 | SIP Torture Test Messages |
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| RFC 4497 or | Interworking between SIP and QSIG |
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| ISO/IEC 17343 |
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| RFC 4568 | SDP Security Descriptions for Media Streams for SRTP |
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| RFC 4715 | Interworking of ISDN Sub Address to sip isub parameter |
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| RFC 4730 | A SIP Event Package for Key Press Stimulus (KPML) [Partial] |
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Version 6.2 | 117 | December 2010 |
