Question about Gigaset CL660HX handset (CH version)

The Gigaset CL660HX handset (CH version) cannot be connected directly to the Sunrise or UPC Box, as it is a cordless handset that requires a DECT base station.

For use with a Sunrise Connect Box 3, it is possible to connect the CL660HX via a compatible DECT base station such as the Gigaset Box 100. The Gigaset Box 100 is connected directly to the Sunrise Connect Box 3 and then enables the CL660HX handset to be connected via DECT. The Box 100 supports both analogue and VoIP connections and can connect up to six DECT handsets such as the CL660HX.

It is important that your Sunrise router supports DECT, as the handset itself cannot establish a direct connection to a router without a base station. The devices support the GAP standard, which ensures basic compatibility with DECT base stations, but advanced functions are only guaranteed with suitable base stations.