Polycom MGC Administrator Administrator's Manual page 140

Chapter 3 - Defining Network Services
3-90
Table 3-27: Fixed Ports & NAT Dialog Box Options (Continued)
Field
Port Range
Definitions
(cont.)
Signaling [TCP]
Control [TCP]
Description
For example: If each call is allocated 13 ports
(Signaling - 1, Control - 1, Audio - 2, Video - 4, and
Data - 5, for a total of 13 ports), and 6 simultaneous
calls are to be handled by the network, the total
number of ports that is required is 78 (6 x 13). If the
first allocated port is 1025, then the last port will be
2003 (1025 + 78 = 2003).
In this example port number 1037 has not been
allocated, as the starting range for audio and video
port allocation has to be an even number. If an odd
number is entered an error message appears to
remind you of this requirement.
Note: You can allocate the same port number to
different channels provided the numbers are in two
different protocols; one is in TCP and the other is in
UDP. For example you can allocate port numbers
2000-2009 to the Signaling channel in TCP and ports
2000 -2002 to the Audio channel in UDP.
Define the ports used for transferring call setup
messages. After you enter the beginning of the
range, the system automatically fills in the end of the
assigned range.
If the signaling port is set to 49181, and one signaling
port is allocated per call, and your total number of
calls is 6, then the last number allocated by the
system will be 49186 (inclusive numbering, using the
port numbers 49181, 49182, 49183, 49184, 49185
and 49186 = 6).
Define the ports used for control messages (setup,
maintenance, and teardown of sessions). After you
enter the beginning of the range, the system
automatically fills in the end of the assigned range.