exten => 1,1,Ringing
exten => 1,2,VoicemailMain(${CALLERIDNUM})
exten => 1,3,Hangup

exten => 11,1,Ringing
exten => 11,2,VoicemailMain()
exten => 11,3,Hangup

exten => _1XXXX,1,Ringing
exten => _1XXXX,2,MailboxExists(${EXTEN:1})
exten => _1XXXX,3,Playback(invalid)
exten => _1XXXX,4,Hangup
exten => _1XXXX,103,Voicemail(u${EXTEN:1})
exten => _1XXXX,104,Hangup