exten => i,1,Set(iATTEMPTS=$[${iATTEMPTS}+1])
exten => i,2,GotoIf($[${iATTEMPTS}=4]?4])
exten => i,3,Goto(s,5)
exten => i,4,Playback(custom/sorryyouarehavingtrouble)
exten => i,5,Playback(custom/goodbye)
exten => i,6,Hangup