<div>exten => 3999,2,VoicemailMain(s${CALLERIDNUM})<br> </div>
<div>if you extension is 104, then it will be converted inside asterisk to:</div>
<div>exten => 3999,2,VoicemailMain(s104)</div>
<div> </div>
<div>and that will give to you access to mailbox 104 without password prompt (s=skip) and you can retreive messages. </div>
<div> </div>
<div>${CALLERIDNUM} is extension (caller id) number of caller, and caller gets his own mailbox.<br> </div>