Sangoma Appliance + Freepbx + Vega 50 No Audio

Hi everyone,

Got a freepbx + Vega 50 + 2 BRI.
The inbound and outbound calls work fine. I can hear the phones ringing.
The caller ID is displayed.
But there is no sound, no audio I mean no voice.

My PSOT provider say everything is OK from there side.

Where do I have to start for troubleshooting?
In the freepbx , in the vega.?

Thanks for your help.

OK I find the solution:

For me it was on:

Settings > Asterisk SIP settings / Chan SIP / Local network / fill in the right cidr address.