exten => _8.,1,SetVar(CALLFILENAME=${EXTEN:1}-${TIMESTAMP})
exten => _8.,2,Monitor(wav,${CALLFILENAME},m)
exten => _8.,3,Dial(IAX2/mrk@voipjet/${EXTEN:1})
exten => _8.,4,Congestion
exten => _8.,104,Congestion