security gap in MD110 voice mail!

[amalpbx12]

Hi guys,
It is really a pleasure to write you again.I have discovered a security hack in MD110 voice mail.
The story is that when I press 89 in my telephone I get access to my mail, and then promoted to enter my password."every thing sounds ok till now".
but when I press 89 then star " * " button,then any other voice mail number ,I get access to any voice mail.
So,please can help me to find a solution for this.
I should be grateful if you could reply as soon as possible.
best regards

To ALREI or not to ALREI,this is the command

 

[parnum]

this is usual, you set a PIN number on all the mailboxes for security, and not leave them as default? * drops back a menu. the mailbox you need to be concerned over is the admin mailbox, that nobody can dial back out once in the voicemail.

best parnum