The default port used is 6001. The IP panels use UDP , RTP , G722 codec, for control data and audio . Use TCP/IP for user ID and password login. No IP addresses are transferred across the internal matrix backplane.
When using external IP addressing , BOTH TCP/ port 6001 and UDP port 6001 must be port forwarded and opened up in the firewall
see : https://clear-com.atlassian.net/wiki/spaces/SF/pages/158759024