Appendix
197
The following figure illustrates a successful call between Yealink SIP IP phones in which
parties are in a call, one of the participants receives a call from a third party, then
answers the incoming call. 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 A calls User B.
2. User B answers the call.
3. User C calls User B.
4. User B accepts the call from User C.
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