I googled it! It is an ESI manufactured system. Someone with a connection to ESI Tech Support will have to have them reset the password and the system will need to be up and running with a known phone line connected to it.

The most painless way to accomplish this is to get the System, Power Supply and 1 Phone in the hands of an ESI tech. After that your good to go.

The ESI tech will expect to be compensated a minor amount but that amount is the difference between the system working for you or just collecting dust.