[outgoing]
exten => _1XXXXXXXXXX,1,DIAL(IAX2/thomasamiller@teliax/${EXTEN},20)

exten => t,1,NoOp
exten => t,2,Playback(welcome-message)

exten => s,1,NoOp
exten => s,2,NoOp
exten => s,3,Playback(welcome-message)