[context-voicemail-record-greeting]
exten =>     *789,1,Wait(2)
exten =>     *789,n,Playback(/etc/pbx-voicemail/greeting)
exten =>     *789,n,Wait(5)
exten =>     *789,n,Record(/etc/pbx-voicemail/greeting:WAV,20,90,k)
exten =>     *789,n,Wait(2)
exten =>     *789,n,Playback(/etc/pbx-voicemail/greeting)

[context-voicemail]
exten =>     s,1,Wait(2)
exten =>     s,2,Playback(/etc/pbx-voicemail/greeting)
exten =>     s,3,Wait(2)
exten =>     s,n,Record(/tmp/voicemail%d:WAV,20,180,k)

exten =>     h,1,System(/etc/pbx-voicemail/pbx-send-voicemail '${RECORDED_FILE}.WAV' '${CALLERID(all)}' &)