[inbound]
exten => s,1,NoOp(Inbound Call CallerID: ${CALLERID(all)})
exten => s,n,Answer()

exten => s,n,Dial(SIP/YOUREXTEN,20)

exten => s,n,Playback(im-sorry)
exten => s,n,Playback(nbdy-avail-to-take-call)
exten => s,n,Voicemail(5555)
exten => s,n,Hangup()

exten => a,1,VoicemailMain()

exten => 1001005555,1,Goto(inbound,s,1)