T-Com Sinus 700K cordless phone

The Sinus 700K is a DECT cordless telephone originally marketed by T-Com, a former division of Deutsche Telekom. These devices were part of a long-standing line of landline communication hardware designed to provide reliable wireless communication within homes and offices. Although branded by the German telecommunications giant, the physical manufacturing was often handled by specialized electronics partners like Siemens or VTech.

Deutsche Telekom, the ultimate owner, evolved from the state-owned Deutsche Bundespost and remains one of the world's largest telecommunications companies. While the production of these specific legacy landline models has largely transitioned to newer IP-based hardware, the Sinus brand remains a staple of German telecommunications history. Ownership remains firmly with Deutsche Telekom AG, headquartered in Bonn, Germany.