[from-iax]
exten => _X.,1,Answer
exten => _X.,2,Ringing()
exten => _X.,3,Dial(SIP/${EXTEN:1},10,t)
exten => _X.,4,Dial(IAX2/usr@gw4/11402233344)
exten => _X.,5,Playback(on-no-answer)
exten => _X.,6,Hangup
exten => _X.,104,Goto(110)
exten => _X.,105,Goto(110)
exten => _X.,110,Playback(is-curntly-busy)
exten => _X.,111,Hangup