Thisguy

We setup a new system this past friday using snom one mini (fw 4.5.1.1107) phones are snom 821 (fw 8.4.35) After the setup on Friday everything we tested was working fine. Today when we call extension to extension it rings, but no audio. Everything else is working fine. Outgoing calls, no problem, incoming calls no problem. Call extension 102 to extension 107, it rings, but when picked up no audio at all. Any help is appreciated.