TANDBERG Utility - Manual (Page 136)

TANDBERG COMPASS MXP / UTILITY MXP
128
H.323 Ports
Static When selecting static H.323 ports for TCP connections the ports 5555 to 5565
will be used for Q.931 and H.245 respectively.
Dynamic The system will allocate which ports to use when opening a TCP connection.
The reason for doing this is to avoid using the same ports for subsequent calls
as some firewall consider this as a sign of attack.