This sounds like the bug I'm aware of but the software version doesn't match. I looked online to find the knowlege base article but couldn't find it. Below is the text of the readme doc provided by Mitel with the patch to "fix" the problem..
Ralph
This is a temp. patch for p.140570 to address the issue of Voicemail boxes dialling 0,
instead of calling pager number
This patch contains the following files
-stopdial0.o
-readme.txt which provides instructions how to apply
Before begining, in the shell, enter 'cd "/sysro"'
Then enter 'pwd'
You should see /sysro in the results.
Procedure to apply this path on Rel 7.0, 7.0 UR1, 7.0 UR2 and 7.0 UR3.
Step 1: Manually ftp all of the above file(s) into 3300 as follows:
On your PC, open a DOS prompt and do the following action on DOS ( or cmd) prompt.
Change to the folder that include stopdial0.o
e.g. If your folder is c:\patch, TYPE: cd c:\patch
Start the ftp session and perform tasks as follows:
TYPE: ftp <ip address of the controller>
Enter your ESM username and password to login
TYPE: binary
TYPE: hash
TYPE: put stopdial0.o
Type: bye
Step 2: Load the patch in RAM ( not require to reboot)
On RTC shell ( maintenance/serial port)
i.e At --> prompt
Type: ld < stopdial0.o
Step 3: To fix corruption:
The user has 3 options:
1. stopdial0
this one cleans all mailboxes right away and then set up the
automatic 1:30 AM schedule
2. stopdial0 "nosched"
this one cleans all mailboxes right away and skips making a schedule
3. stopdial0 "schedonly"
this one does not cleans mailboxes right away. The scheduled 1:30 AM run
will do it.
On RTC shell, Mitel recommends to type:
Type: stopdial0 "noshced" ##Comment : this is to check and fix immediately
Once you confrim the fix, you can
Type: stopdial0 "schedonly" ##comment: This is for preventive measure
Note: If the system reboots, you need to repeat step 2 and Step 3 (if required)