Can't see the video and/or hear the audio from the far-end in an H.323 call.
1) Ensure proper bandwidth is available to the VC devices.
2)Ensure the following ports are open in the firewall for proper video and audio transfer
- 389 TCP
- 1718-1719 UDP
- 1720 TCP
- 1731 TCP
- 5004-6004 TCP and UDP