Wi box telephone services

Has anyone used the telephone service on Wi Box system?

I am considering transferring our France Telecom line over to this.

We initially had major problems with the internet connection, but it has massively improved, so I am tempted.

We have quite an ageing population here in the village, so not many people to ask - any feedback gratefully received!

Thanks, I know about the link as we already have Wi Box internet.
I was trying to get an idea about how efficient the phone was. Thanks anyway.