[brains2phoney]             
exten => _91NXXNXXXXXX,1,NoOp(Zap/1/${EXTEN:1})
exten => _91NXXNXXXXXX,n,Dial(Zap/1/${EXTEN:1})  
exten => _91NXXNXXXXXX,n,Hangup
exten => _91NXXNXXXXXX,n+100,Hangup