Polycom RealPresence 800s Administrator's Manual page 321

Although you can define fixed ports, these ports are not implemented by the RealPresence
Collaboration Server 800s.
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Polycom, Inc.
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 Collaboration Server uses this recommendation along with the
number of licensed ports to calculate the port range.
Modify the following fields:
Table 16-8 Default IP Service – Conferencing – Ports Parameters
Field
Fixed Ports
TCP Port from - to
Description
Leave this check box cleared if you are defining a Network Service for
local calls that do not require configuring the firewall to accept calls
from external entities. When cleared, the system uses the default port
range and allocates 4 RTP and 4 RTCP ports for media channels
(Audio, Video, Content and FECC).
Note: When ICE Environment is enabled, 8 additional ports are
allocated to each call.
Click this check box to manually define the port ranges or to limit the
number of ports to be left open.
Displays the default settings for port numbers used for signaling and
control.
To modify the number of TCP ports, enter the first and last port
numbers in the range.
The number of ports is calculated as follows:
Number of simultaneous calls x 2 ports (1 signaling + 1 control).
Chapter 16-IP Network Services
16-13