Questions about Panasonic Kx-Prs110

I am using the phone with the 'Swisscom Internetbox 2' without any problems ... Cable connected directly to one of the two phone connections.

Yes, it is simply an analogue telephone that is connected to one of the Gigabox telephone connections. We switched to the PRW 120 model at home because it has a free app that allows you to make calls to the landline at home from your smartphone. The connection is made via the home WLAN. Our 110 is now running at Grandma's and she is very happy with it.

I don't know.

Yes, it is

Unfortunately, this question is too specific for us and therefore we cannot answer it. We have forwarded it to our community so that someone who knows the products better can answer it.