Something

; this goes in extensions.conf

[aa-mbox-demo]

exten => s,1,Answer
exten => s,2,Set(TIMEOUT(digit)=2)
exten => s,3,Set(TIMEOUT(response)=5)
exten => s,4,Background,message-instructions-greeting


exten => _1,1,Voicemail,u100
exten => _2,1,Voicemail,u200
exten => _3,1,Voicemail,u300
exten => _4,1,Voicemail,u400

; this goes in voicemail.conf

100 => 1234
200 => 1234
300 => 1234
400 => 1234