I had an IVP8 rev 2 crash and I replaced it with an older IVP8 rev 4.2/1.08. I did the plug and play using ADMIN3, R3ADMIN and UADMIN21 all with the same results. It works great if using 2 digit mailboxes, but not if using 3 or 4 digit mailboxes. I need 4 digit mailboxes to work but when testing and a call is b/na forwarded to vmail, I get "that was an invalid entry" prompt. The message lights turn on and off fine using 4 digits. I'm missing something but it's been years since I've done this. Any help would be greatly appreciated..