With the conversion is based on IP by Telekom buying a new router was due, the decision was made to Box 7490, no regrets! At the same time two of these phones were purchased. Everything is not particularly cheap, but technically on a high level! Meanwhile, it can be assessed that these purchases have really paid off. The phones were child's play to connect with the box, a base station as before is no longer necessary, the box itself is the base station. All other technical expectations have ebenffalls met. The address is in the router, the access from the Fritz! Fon from is effortless. So, for technically demanding this combination between the router and the phone of the same brand is highly recommended!