I've run into a bizarre issue with one of our 3cx servers. The system has been working fine until I was configuring the fax service. We suddenly began getting all external calls with one-way audio. I ran the firewall checks and everything came back as passed. At the end of the firewall check, the media server service failed to start up and suddenly the one-way audio issue was fixed! This is 100% reproducible on this system. If I turn on the media server service, we get one-way audio & if I stop it, calls are normal. I've tried a full backup & restore to resolve the issue to no avail. I also tried a clean install and just re-configured the whole system but the issue came back. Any thoughts?