[asterisk-users] Attended transfer: transferring a call as soon as the destination starts ringing

[A. B.]

Hi all!

Ext A, B and C are SIP phones.

Ext A receives a call from Ext B. Ext A wants to transfer the call to Ext
C.  Ext A puts the first call on hold, dials Ext C, then simply hangs up as
soon as the call to Ext C starts *ringing*. In other words, Ext B wants to
be sure Ext C is ringing (i.e. it is not busy or unavailable) but doesn't
want to talk to him.

Unfortunately, as soon as Ext A hears Ext C is ringing and hangs up or hits
"Transfer", the call is closed and a *new* call from Ext B to Ext C starts.
This way, Ext C sees an unanswered call from Ext A, which is an unexpected
behaviour.

I played with directmedia and directrtpsetup, but no success so far. Any
ideas, please?

Thanks in advance.

Alex
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