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Chapter 15-IP Network Services
Polycom, Inc. 15-13
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.
9 Modify the following fields:
Table 15-7 Default IP Service – Conferencing – Ports Parameters
Field Description
Fixed Ports 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).
Click this check box to manually define the port ranges or to limit the
number of ports to be left open.
TCP Port from - to 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).
UDP Port from - to Displays the default settings for port numbers used for audio and
video.
To modify the number of UDP ports, enter the first and last port
numbers in the range, and the range must be 1024 ports.
If the network administrator does not specify an adequate port range, the system will accept the
settings and issue a warning. Calls will be rejected when the Collaboration Server’s ports are
exceeded.