It should be noted a safety notice Telekom (product warning for the type B [.....]). Unfortunately, I do not know if the pasted link is time released. If it again should not be the case in brief: there was a vulnerability that has been fixed with a firmware update. The article can be found on the Telekom side Help & Service - Search for "Product Warning of vulnerability in the WiFi Protected Setup (WPS) feature of the Speedport W 723V Type B". There are also instructions on how to read out the current firmware version and the firmware update for the type B. In my unit, incidentally, was the 1.36.000 it, seems to be the current latest firmware.
Bin otherwise satisfied with the router. Use the home network incl. Smart TV. Telephony via Splitter (ME for analog telephony [is still available] enough - simultaneously fallback in case of failure of the router).