For the best results on video calls using the H323 protocol, the following ports should be opened on the Firewall:
Gatekeeper Discovery (RAS) | Port 1719 | UDP |
Q.931 call Setup | Port 1720 | TCP |
H.245(Static) | Port Range 5555-6555 | TCP |
H.245(Dynamic) | Port Range 11000-20999 | TCP |
Video* | Port Range 2326-2485 | UDP |
Audio* | Port Range 2326-2485 | UDP |
Data/FECC* | Port Range 2326-2485 | UDP |
*Configurable by "RTP Ports Range Start" and "RTP Ports Range Stop"