[Asterisk-Users] VoiceMail without password? How?

[Goran Dj.]

If my extension is 22, and voice mail access number is 909, then with
 exten => 909,1,voicemailmain(s22)
I can access voice mail 22, without number and password prompt.

But, I want that every extension can access its voice mail without
number and password. So, when I put
 exent => 909,1,voicemailmain(${calleridnum})
voicemail want only password.

I want to eliminate password too, so when I put
 exten => 909,1,voicemailmain(s${calleridnum})
this DO NOT work. Voicemail want number and password.

Why? Bug?