[Asterisk-Users] Announced Call Transfer

[listasterisk at comtek.co.nz]

I know this topic has been done before but I cant find an answer for it 
anywhere.

I have Grandstream phones running with my Asterisk server.

Is there anyway to do announced transfers with these phones?

i.e. A is talking to B, A then presses a key to initiate transfer, calls C, 
tells C that B is on the phone.  Then A hangs up and C is connected to B.


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