Call setup and media ports
To place calls to other systems through the firewall, you must configure your firewall to allow incoming and outgoing traffic to the system through the following:
|UDP port 1719
|TCP port 1720
|H.323 call negotiation.
|UDP port 5060
|SIP call negotiation.
|TCP port 5060
|SIP call negotiation if TCP signaling is enabled for SIP calls.
|TCP port 5061
|TLS signaling in SIP calls if TLS signaling is enabled.
NOTE: TLS is the only transport supported for encrypted calls.
and UDP ports
|Range specified in Preferences > Network > Reserved Ports.