| ITU: H.323 V4, H.225, H.235, H.245, H.450 |
| RFC 1889 - RTP/RTCP |
| RFC 2327 â SDP |
| RFC 2833 â RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals |
| RFC 2976 â SIP INFO Method |
| RFC 3261 â SIP |
| RFC 3264 â Offer/Answer model with SDP |
| RFC 3515 â SIP REFER Method |
| RFC 3842 â A Message Summary and Message Waiting Indicator |
| RFC 3489 â Simple Traversal of User Datagram Protocol (UDP) |
| RFC 3891 â SIP âReplacesâ Header |
| RFC 3892 â SIP Referred-By Mechanism |
| draft-ietf-sipping-cc-transfer-04 â Session Initiation Protocol Call Control |
| Codec: G.711 (A/µ law), G.729A/B, G.723.1 |
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