[celular]
exten => _[789]XXXXXXX,1,Authenticate(/etc/asterisk/pinsets|a)
exten => _[789]XXXXXXX,2,Dial(Unicall/g1/${EXTEM})
exten => _[789]XXXXXXX,3,Goto(1-${DIALSTATUS},1)

exten => 1-NOANSWER,1,Hangup
exten => 1-BUSY,1,Playtones(Congestion)
exten => 1-HANGUP,1,Hangup
exten => 1-CHANUNAVAIL,1,Playtones(congestion)
exten => 1-CHANUNAVAIL,2,Hangup
exten => 1-CONGESTION,1,Playtones(congestion)
exten => 1-CONGESTION,2,Hangup
exten => 1-CANCEL,1,Playtones(Congestion)
exten => 1-CANCEL,2,Hangup