Hi all,
A few days ago I was offered a work (project) into which I have never ventured but find it interesting.
There is a small company with about 50 employees in it. THey use an old EPABX system which only has the provision of providing the users with a "0" dial. (i.e. when ever the user of designated extensions, presses 0, he can make local outgoing calls. Otherwise, he can only use the telephone for intra-office communication). Now, they want to upgrade this to facilitate its employees as follows... Each member is given a specific code (say 3-4 digits). Only when the employee dials his secret number will he be allowed to access the external line. This way the company wants to account for all the calls being made by the employees. They dont know what the EPABX is but said that the guys from that company, who stopped servicing it as it was an old one, said that their company does not have the up-grade kit for this purpose.

Now, my question is, can some sort of reverse-engineering be done on it and the program modified to accommodate this addition? Or is there any other method of implementing this feature. By the way, the motherboard of the system contains P80C32UBPN and MT8981DE chips. The first one, philips, is the mC for sure I know, but what is the second one? is it also a mC from Motorola? If so, why are they both co-existing in the same board. Excuse my doubts, if found to be very simple etc etc. I've never ventured into telecom field till now.
ANy suggessions?

REgards,
Harsha