Speedphone 10 Dect with station

Have the Speedphone chosen because I have my provider of IP telephony and associated router. After I tested the phone extensively, I submit my opinion on the Speedphone 10. The first thing you notice is that the price at Amazon is cheaper than at Telekom.
But back to Speedphone, it fits comfortably in your hand and is easy to operate. The keyboard is also suitable for large fingers. The menu is not extensive. There is much set on the router. What bothers me is when the Speedphone falls into the power saving mode that you only need to press twice the keyboard until you can see the phone book. If one uses the voicemail box you can no longer determine who has called. Is sometimes a hindrance. It is also very unfortunate that the manufacturer has not ensured that you can accept telephone directories from other phones. At the present time that would have been part of the standard.