The Fritzbox is the best alternative to the Swisscom cucumbers, since a few weeks you can read out the SIP credentilas in the Swisscom Kundencnter, so there is no more problem with the Swisscom-IP telephony ....

We use this modem as internet access for our company with a Swisscom subscription. It works perfectly. For the Voip services we use SIPCALL, which also works perfectly.
But we have also heard that the Voip services from Swisscom do not work with this modem. It's not a big deal because there are alternatives.

We would advise against using this device as a modem replacement via a Swisscom Internet connection. Swisscom no longer transmits the login data and the network can therefore only be used via a Swisscom-compatible modem.

This router works perfectly with Swisscom TV 2.0 + Swisscom IP telephony.

I do not have the Swisscom IP access data and did not have to provide it. I disconnected the Centro grande router and replaced it with this Fritzbox. It has been working for 1 year now.