How to activate feature 981? - Lands Phones

SOURCE: I have M7310 phones with the complete system I can

If none of the voice mail feature codes work (feature 980-989) then the voice mail system is either not working or isn't recognized by the telephone system.Go to your communications closet and check to see if theres a power light on in the voicemail.If not then you might want to call in your tele system service provider.

SOURCE: how can I activate feature 981

Press FEATURE (above the HOLD key on old sets or the Nortel Symbol on the new sets)
Then press 981 on the dial pad.

If states "Inactive when done then your voice mail system is down or the feature code was changed, either way if you do have voice mail then call your tech in to check the system right away.