Cisco Unity 4.0(1) and later complies with the Session Initiation Protocol (SIP) RFC 2543 standard. This white paper contains the following sections: 1) How SIP Integration with Cisco Unity Works, 2) SIP Methods, 3) SIP Responses, 4) SIP Header Fields, 5) SIP Session Description Protocol (SDP) Usage, 6) Transport Layer Protocols, 6) SIP Security, 7) SIP DNS Records Usage, 8) SIP DTMF Digit Transport, 9) Codec Support, 10) Additional References.
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