Kristi22 I found this from a customer:
I am running a Gigaset SL450 A GO on the analog phone line of the UPC Connect Box. This is running fine. Additionally, I have connected the Ethernet port of the phone to the Internet, although I do not use Internet telephony (6 providers would be possible). As a result, the numbers of the calls are looked up at Search.Ch and immediately shown on the phone’s display.
Most analog phones from Gigaset are compatible.