extensions.conf
[sipout]
exten => _X.,1,Answer()
exten => _X.,n,Set(CALLERID(num)=2301879)
exten => _X.,n,Curl(http://www.web.de)
exten => _X.,n,Dial(SIP/${EXTEN}@sipgate-out,30,trg)
exten => _X.,n,Hangup()
[from-sipgate]
exten => _X.,1,Answer()
exten => _X.,n,Hangup()
[lokal]...