[outbound]
exten => _Z1NXXNXXXXXX,1,Set(TRUNK=${EXTEN:0:1})
exten => _Z1NXXNXXXXXX,n,Set(TRUNK=${IF(${TRUNK}=5?SIP/broadband/+)})
exten => _Z1NXXNXXXXXX,n,Set(TRUNK=${IF(${TRUNK}=6?ZAP/1/)})
exten => _Z1NXXNXXXXXX,n,Set(TRUNK=${IF(${TRUNK}=7?IAX2/jnctn/)})
exten => _Z1NXXNXXXXXX,n,Set(TRUNK=${IF(${TRUNK}=8?IAX2/voipjet/)})
exten => _Z1NXXNXXXXXX,n,Set(TRUNK=${IF(${TRUNK}=9?IAX2/teliax/)})
exten => _Z1NXXNXXXXXX,n,Dial(${$TRUNK}${EXTEN:1})