What steve said, you would need emanager software to change the names.

Toshiba did come out with a way to change names by using a phone somewhere in about version 2.21 or 2.22, but this has to be enabled. It is disabled on all phones by default. So the chance it would work for you is very close to 0.01%.

The admin box you where using is just for the voicemail system. It would not make any changes to the phone. If there is a name in the mailbox, then it is only ised for a dial-by-name directory in the voiecmail system.

Emanager usually works even on old systems, but if the CTX software is really old, it gets buggy.