Mine

[from-pstn]
; this is where voip stuff comes in on right now....

exten => s,1,Goto(mainmenu,s,1)
exten => _X.,1,Goto(mainmenu,s,1)

[mainmenu]

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

exten => s,1,Wait(2) ; pause for CallerID to register
exten => s,2,Answer()
exten => s,3,Background(welcomemessage)
exten => s,4,Background(pleaseenterextension)
exten => s,5,NoOp(Just Filler)
exten => s,6,Set(TIMEOUT(digit)=3)
exten => s,7,Set(TIMEOUT(response)=15)