Polycom RMX 1500 Administrator's Manual page 458

14-20
8
Click the Ports tab.
Settings in the Ports tab allow specific ports in the firewall to be
allocated to multimedia conference calls.
The port range recommended by IANA (Internet Assigned Numbers
Authority) is 49152 to 65535. The MCU uses this recommendation
along with the number of licensed ports to calculate the port range.
9
Modify the following fields:
Chapter 14-Network Services