I contacted the telekom customer support: They said, that nothing has changed from their side. And since I didn't buy or rent the router from Telekom, they can't give me any support for it :-(...

Hello! I use the tp-link VR900v as a router (Germany, provider Telekom). A landline DECT telephone is connected to the router (Siemens Gigaset C620). Has been running flawlessly for years, and even...