Works only insufficiently at a Gigaset PBX

I bought the phone to operate at a Gigaset DX800A. Now, the coupling work quickly and without problems. But even transferring the contacts just ran across two corners (with MyPhoneExplorer).
The SL930H time during operation on the DX800A no caller numbers, are again no call lists and can not access the AB to uv.a.
So if you want to operate it with other Gigaset devices together, you should first look at exactly what he needs it.
Too bad - looks actually good and is good only plenty warm in the Hand.Wird ...