So, B transfers the call and after bridging to C, B should get an
announcement.
This is just an idea:
See whether you can dispatch the termination of the call leg B-C by
evaluating the DIALSTATUS variable. I am not sure whether you can see
this inside the dialplan, but you should get the event via AMI. This is
only the 1st part of the solution.
A general solution would require a lot of things or may not be possible
at all as you can transfer calls not only via Asterisk using DTMF
signalling, but also the SIP phones themselves might be capable of
transferring calls, thereby circumventing Asterisk.
jg
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