[Menu]
exten => s,1,ResponseTimeout,15
exten => s,2,Background(main-menu)
exten => s,3,DigitTimeout,15
exten => s,4,NoOp(After Background)
exten => 1,1,NoOp(Menu-1)
exten => 2,1,NoOp(Menu-2)
exten => i,1,NoOp(Menu-invalid)
exten => t,1,NoOp(Menu-timeout)

[from-sip-internal]
exten => 1,1,Answer
exten => 1,2,Goto,Menu|s|1
exten => i,1,NoOp(sip-invalid)
exten => t,1,NoOp(sip-timeout)