Thank you for helping.
My fritz does not support VDSL2, so I used to have it behind the b-box , with voip configured in the fritz , and I was living a happy life !!!!

Then why change it, you may ask ? because the new android tv box that I got from proximus does not work with the ftriz as a router ...

Hello,
I have configures a voip provider in the b-box 3.
I can make and receive calls. No problem BUT the calls drops , gets disconnected every two to three minutes.

The same VOIP provider was configured on a different device for years and no glitches (I had a fritzbox and I HAD to replaced it with ...