Yes, the Gigaset Comfort 550 HX can be connected to a Swisscom Internet Box 4 that is connected to a digital home connection. The device is compatible with all DECT/CAT-iq-enabled routers, and the Swisscom Internet Box 4 supports this technology. It can be easily connected to routers such as the FRITZBox or the Telekom Speedport, which also applies to the Swisscom Internet Box 4.

The Gigaset Comfort 550 HX phone does not need to be connected directly to the UPC router, as it works using DECT (Digital Enhanced Cordless Telecommunications) technology and connects to a specific charging base. - A charging base is supplied with the phone, which also includes the corriente adapter and other accessories such as AAA recargables pilas, a batería tapa and a cinturón clip.

Yes, I was supplied with a plug and power supply unit. Best regards!

Yes, you can.

Yes, unfortunately this phone is an additional device if you already have a DECT base station.

The Connect Box from UPC has two analogue ports (https://www.upc.ch/de/support/internet/fehlerbehebung/netzwerk-router/) for digital fixed network telephony and the Gigaset can also be used with analogue connections (https://www.gigaset.com/ch_de/gigaset-comfort-550-ip-flex-ch/).