Sometimes, your client will disable your video feed because it has determined that either your network connection (or the remote caller) is unable to send a high-quality feed.
If your camera is disabled, you can try the following..
- Make sure you have at least 1mbps available upload bandwidth
- Make sure that the remote caller has at least 1mbps available download bandwidth
- Have both callers connect via Ethernet instead of WiFi. This can help with packet loss, jitter, and bandwidth on your network