Since our router (Speedport W 921V) is in the upper floor we needed for telephony downstairs necessarily a DECT phone. The operation of the Gigaset A540 A via DECT at Speedport basically functioning. The two handsets can each have their own phone number assigned Vedas. However, the handsets are displayed as internal devices, so the internal discussions are not possible - because the handsets but have their own phone numbers external calls möglich.Im contrast to the previous DECT phone Panasonic can each have a phone book can be created in the handsets ( on the scale in the Speedport phonebook but can not be accessed). The additional expenditure for the answering machine has not paid off. Possibly I think over time nor a way to use this. Right now I'm just happy that I can make calls. The choice of ring tones is sufficient for our purposes. After a short time I find my way without manual menu. All in all I am quite satisfied.