Does this phone also work without the Fritz!Box as a router and also with an alternative provider such as SipCall? I usually have all the WiFi technology from Swisscom and would like to make calls via this phone with SipCall.

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Answer

No, it will not work like that. The Fritzfon works via DECT radio and requires a base station. What should the Fritzfon communicate with without a Fritzbox?

It should be possible to deactivate everything on the Fritzbox that you don't need, so that it would only act as a base station. The Fritzbox can provide SIP for the Fritzfon.

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Question about AVM FRITZ!Fon C5 International / CH

Does this phone also work without the Fritz!Box as a router and also with an alternative provider such as SipCall? I usually have all the WiFi technology from Swisscom and would like to make calls via this phone with SipCall.