I have a customer that has a PMVS R5 with a ACS R3.03 and would like to use all 48 mailboxes-The problem is the higher mailboxes are in the 50's. I can't dial the mailbox numbers in the 50's internally or through the auto attendant. I beleive this is because the dial plan will not go that high. All I get is an error tone . I think I know the answer to this one, but I am hoping someone may be able to help. I haven't been able to figure a way to even transfer a caller to one of these mailboxes or leave a message internally.