[robinson-family]
; If nobody picks up within 30 seconds, the call is sent to voicemail
; If the extension is busy, the call is sent to voicemail
exten => _20[0-3],1,Set(TARGETNO=${EXTEN})
exten => _20[0-3],n,Dial(SIP/${EXTEN},30)
exten => _20[0-3],n,Goto(s-${DIALSTATUS},1)  ; routes the call to the st
atus priority (NOANSWER,BUSY,CHANUNAVAIL,CONGESTION,ANSWER)
exten => s-NOANSWER,1,VoiceMail(${TARGETNO},u) ; Person at extension "is
 unavailable" message
exten => s-BUSY,1,VoiceMail(${TARGETNO},b)     ; Person at extension "is
 busy" message
exten => s-ANSWER,1,Hangup()                 ; To be safe, clean up the
call after an answer by hanging up
exten => _s-.,1,Goto(s-NOANSWER,1)           ; Handle any unhandled stat
us the same way we handle NOANSWER

; Check your voicemail from your own extension by dialling "250"
exten => 250,1,VoiceMailMain(${CALLERID(num)})