If your network is using a Sophos SG 210 firewall, ensure you have the correct settings. Without these, the firewall might mistake video traffic for a DoS attack.

Go to Network protection > Intrusion prevention > Anti-DOS flooding.

Add exception to trust traffic:

  • from <subdomain>.call.sl to all internal addresses
  • from all internal addresses to <subdomain>.call.sl

The following screen shot shows this configuration: