On a site this am , ext 100 lcd screen says p 550. What is this and can i remove from the screen ?

Another customer called that sometime during the day 12 noon till about 1;30 all calls go to voice mail and do not
ring the phones. Auto attendant tells caller to press 0 then all office phones ring.
This is a used VM card, i thought i defaulted it but maybe not.
Thank you Gary S.


Gary Stevens