Router configuration

I have one of the older no longer made iSight cameras (the tube type that also looked like a microphone because it is a microphone). The audio/video will not go through my Netgear ProSafe VPN Firewall. Everything is fine when I connect the Mac straight to the internet (via cable modem).The other person can receive my audio/video. How do I configure the router/firewall to allow the video/audio to be sent to the other person who is also using a newer iMac with iSight built in?. I can receive the other persons audio/video but they can't receive my audio/video when going through the router/firewall. It is the Netgear FVS114