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Appendix

459

4. User C answers the call.

Call is established between User A and User C.

User A Proxy Server User B

F1. INVITE B

F4. 180 Ringing

F6. 200 OK

F7. ACK

2-way RTP channel established

F23. 180 Ringing

F11. REFER

F12. 202 Accepted

F26. 200 OK

F2. INVITE B

F3. 180 Ringing

F5. 200 OK

F8. ACK

F22. INVITE C

F19. 200 OK

F27. ACK

F18. BYE

2-way RTP channel established

F9. REFER

F10. 202 Accepted

F17. BYE

F20. 200 OK

F21. INVITE C

F24. 180 Ringing

F25. 200 OK

F28. ACK

User C

Yealink SIP-T2XP Administrator's Guide

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