NorStar M7324 Telephone "unlock nortel voicemail box" Questions

...Nortel M7324 phone at the reception desk. I have no problem resetting the password for any other voicemail EXCEPT the reception desk phone which is where the auto attendent / general voicemails drop ...

I have a Nortel Networks Norstar M7310 phone. My voicemail box is locked and I do not know how to unlock it! Hello my mobile set is 2690 I forgate my security code piz help me