Negatives:
I use the phone as a second phone to an ISDN distribution. (Worked with my old Gigaset been wonderful). Unfortunately, the Conrad C-Easy reports no more calls after they had accepted a call on another telephone on the S0 bus. This also stands out only if one wants to make a call and the phone claiming that one should nevertheless only times hang up the phone. Solution gives only unplug it and reconnect it to the phone socket. I suspect that it is up to the power supply via the S0 bus.
Then probably my old Gigaset has to serve again despite faulty display. The ringing wenigstes when someone calls me.