Xerox Telecopier 7032:How to erase Account Number

[Thaqalain]

I lost account number to start key pad. Later I uninstalled,unplugged and reinstalled,replugged modem and display dialer key pad,but still 4 digit account number is to be pressed.Any idea to erase/retrieve account number for this fax/copier machine.

Chipset of Modem:Rockwell 83,9027 81250-3
Mexico E2