Well, we got telrad PBX 128 with two cabines and some digital and analog line cards and we need to program it. When connecting to PBX's modem and going to "ONLINE PROGRAMMING" it asks for password. the only password works is blank and it get a response of "0" - I think it means level 0 programming which have no feature access. Please help.

P.S. I think the revision of the software in the system is 6.01J