Yealink SIP-T46G Administrator's Manual page 396

Administrator's Guide for SIP-T46G IP Phone
network.
The call flow scenario is as follows:
1.
2.
3.
4.
User A
F13. INVITE B ( sendonly )
384
VoIPon www.voipon.co.uk sales@voipon.co.uk Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299
User A calls User B.
User B answers the call.
User C calls User B.
User B accepts the call from User C.
Proxy Server
F1. INVITE B
F4. 180 Ringing
F6. 200 OK
F7. ACK
2-way RTP channel established
F10. INVITE A
F11. 180 Ringing
F14. INVITE B ( sendonly )
F316 200 OK
F17. ACK
No RTP Packets being sent
F19. 200 OK
F22. ACK
User B
F2. INVITE B
F3. 180 Ringing
F5. 200 OK
F8. ACK
F15. 200 OK
F18. ACK
2-way RTP channel established
User C
F9. INVITE A
F12. 180 Ringing
F20. 200 OK
F21. ACK