Hello, I already wrote a message but maybe the problem I described was pretty unclear, so here a new Try. The thing is it is really urgent and I am not capable to resolve it for myself. Actually I am not a Asterisk Specialist, but I have to use an Asterisk Server for my thesis... So here the problem in a way breaked down to core-problem: SIP-Phone1 registered in Asterisk context: [default] SIP-Phone2 registered in SIPServerX First SIP-Phone1 <---Call---> SIP-Phone2 than: SIP-Phone1 --REFER, with Refer-To:kalle@sipY.com--> Asterisk Now how could I find the "REFER" in the Dialplan!? That I can do: [default] exten-> ??????,1,do_something(..) and the "do_something", could be anything, or should it be "Dial" or "Transfer"? and what might be the ?????? Thank you very much, Kalle