My TelePresence SX20, you receive calls H 323 protocol a number that says so "h323: cisco" this happens during calls with my other equipment telepresence and standbye
You need to put your system behind your firewall by closing all the inbound ports and only allow known IP address through, one alternative is to use a NAT. Best solution is to use a gatekeeper such as a VCS. Take a look at the following discussions.
