[custom-alarmmsg]
exten => s,1,DigitTimeout(5)
exten => s,2,ResponseTimeout(5)
exten => s,3,SetVar(MACHINE=0)
exten => s,4,Answer
exten => s,5,BackgroundDetect(silence/5, 1000, 50)
exten => s,6,Noop(answering machine detected)
exten => s,7,SetVar(MACHINE=1)
exten => s,8,BackgroundDetect(silence/30, 1000, 50, 30050)
exten => s,9,Noop(this is a very long message)
exten => s,10,Wait(2)
exten => s,11,Background(Goodbye)
exten => s,12,Hangup

exten => talk,1,GotoIf($[${MACHINE}=1]?2:3)
exten => talk,2,Goto(custom-alarmmsg-machine,s,1)       ; this is a machine
exten => talk,3,SetVar(LOOPED=1)
exten => talk,4,Background(message_for_answering_machine)

exten => t,1,SetVar(LOOPED=$[${LOOPED}+1])
exten => t,2,GotoIf($[${LOOPED} > 3]?4:3)
exten => t,3,Goto(talk,4)
exten => t,4,Hangup

exten => 1,1,Goto(custom-alarmmsg-human,s,1)

[custom-alarmmsg-human]
exten => s,1,Background(message_for_human)

exten => 1,1,Goto(s,1)

exten => t,1,Background(goodbye)
exten => t,2,Wait(1)
exten => t,3,Hangup