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<h2 id="call-flow-diagram">Call flow diagram</h2> B2BUA Alice Server Bob | | | | | INVITE F1 | | | |------------------->| | | | 100 Trying F2 | | | |<-------------------| | INVITE F3 | | | |------------------->| | | | 100 Trying F4 | | | |<-------------------| | | | 180 Ringing F5 | | 180 Ringing F6 | |<-------------------| |<-------------------| | | | | | 200 OK F7 | | 200 OK F8 | |<-------------------| |<-------------------| | ACK F9 | | ACK F10 | |------------------->| |------------------->| | | | RTP Media | | RTP Media | |<==================>| |<==================>| | BYE F11 | | | |------------------->| | BYE F12 | | 200 OK F13 | |------------------->| |<-------------------| | 200 OK F14 | | | |<-------------------| | | | | <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Real-time_Transport_Protocol/YKQK1RK2">Real-time Transport Protocol</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>RFC 3261, SIP: Session Initiation Protocol, IETF, The Internet Society (2002) <a href="/wiki/RFC_(identifier)" target="_blank">/wiki/RFC_(identifier)</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>