[bogus-calls]
exten => _.,1,Congestion

[voicemail]
exten => _XXXXXXXXXX,1,SetVar(CALLEDTO=${EXTEN})
exten => _XXXXXXXXXX,2,GotoIf($[${CALLERIDNUM} = ${EXTEN}]?3:5)
exten => _XXXXXXXXXX,3,VoiceMailMain,${EXTEN}
exten => _XXXXXXXXXX,4,Hangup
exten => _XXXXXXXXXX,5,Dial,SIP/${EXTEN}|20
exten => _XXXXXXXXXX,6,VoiceMail,u${EXTEN}
exten => _XXXXXXXXXX,7,Hangup
exten => _XXXXXXXXXX,107,VoiceMail,b${EXTEN}
exten => _XXXXXXXXXX,108,Hangup
exten => _5172078360,1,VoiceMailMain,${RDNIS}
exten => _5172078360,2,Hangup
exten => a,1,VoiceMailMain(${CALLEDTO}) ; If they press *, send the user into VoicemailMain
exten => a,2,Hangup