exten => _9.,1,Dial(${TRUNK}:${EXTEN:1})   
exten => s,2,Goto(s-${DIALSTATUS},1)
exten => s-CHANUNAVAIL,1,Dial(${TRUNK2}/${EXTEN:1})
exten => s-BUSY,1,Dial(${TRUNK2}/${EXTEN:1})
exten => s-CONGESTION,1,Dial(${TRUNK2}/${EXTEN:1})