Can a Cisco router be a gatekeeper and NAT traversal box for video calls over the internet? I've been looking at the: http://www.polycom.com/usa/en/products/video/security_firewall_traversal/v2iu_4350t_series.html and I was told that a cisco router might be able to do this as well. Is this possible? If so , what would I need to accomplish this? Dan.