Firewall ports to open for Cisco TelePresence SX series
For IP based H.323 calling between SX series: The following ports are applicable for conference between SX series Cisco TelePresence only.
Screenshot from SX series under System Configuration > H323
For SIP based calling between SX series:
Important note: If the other party uses MXP series TelePresence, then the ports differ, for example RTP media ports for MXP series are UDP 46000-49000 and not 2326-2485. So you need to know about the other party equipment to open the required ports in the firewall.