No Answer Call Forward - Yealink SIP-T48G Administrator's Manual

T2 series; t4 series
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in which User B has enabled no answer call forward. The incoming call is forwarded to
User C when User B does not answer the incoming call after a period of time. In this call
flow scenario, the end users are User A, User B, and User C. They are all using Yealink
SIP IP phones, which are connected via an IP network.
The call flow scenario is as follows:
1.
User B enables no answer call forward, and the destination number is User C.
2.
User A calls User B.
3.
User B does not answer the incoming call.
4.
User B forwards the incoming call to User C.
5.
User C answers the call.
Call is established between User A and User C.
User A
F1. INVITE B
F4. 180 Ringing
F7. 302 Move Temporarily
F8. ACK
F9. INVITE C
F12. 180 Ringing
F14. 200 OK
F15. ACK
Step
INVITE—User A to Proxy
F1
Server
Proxy Server
F2. INVITE B
F3. 180 Ringing
F5. 302 Move Temporarily
F6. ACK
F10. INVITE C
F11. 180 Ringing
F13. 200 OK
F16. ACK
2-way RTP channel established
Action
User B
Description
User A sends the INVITE message to a
proxy server. The INVITE request is an
invitation to User B to participate in a
Appendix
User C
601

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