Very average investment with potential for improvement

My previous ISDN PBX T Concept XI 420 has given up the ghost. She had the same design error as the Eumex now purchased 402: If you take away the power within 20 seconds after connection to the mains, for example by accidentally pressing the power switch on the power strip, then the initialization process is irreversibly stopped. A reinitializing the PABX is no longer possible. Even the telecom service could not help me. For this, I subtract one point.

The power supply is heavy and so large that it takes up two seats in the socket. But I draw from half a star, but unfortunately not going (you can only deduct all star).

First, I tried to set up the facility by phone. After an hour I gave up. It just did not work. But I draw from another star.

The device via a PC WinVista, however, was simple. Since a few days the plant does with us what they want.