exten => _NXXNXXXXXX,1,Random(33:6)
exten => _NXXNXXXXXX,2,Random(66:9)

exten => _NXXNXXXXXX,3,SetCallerID(3605551212)
exten => _NXXNXXXXXX,4,Dial(SIP/1${EXTEN}@13605551212,60,t)
exten => _NXXNXXXXXX,5,Goto(12)

exten => _NXXNXXXXXX,6,SetCallerID(3605551222)
exten => _NXXNXXXXXX,7,Dial(SIP/1${EXTEN}@13605551222,60,t)
exten => _NXXNXXXXXX,8,Goto(12)

exten => _NXXNXXXXXX,9,SetCallerID(3605551223)
exten => _NXXNXXXXXX,10,Dial(SIP/9${EXTEN}@13605551223,60,t)
exten => _NXXNXXXXXX,11,Goto(12)

exten => _NXXNXXXXXX,12,Congestion