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On some firewall systems, you are not permitted to use well-known ports, in order to maintain security. In this
case, users may need to change the default port numbers to allow the PBX gateway to function. Such
modifications can be done through the Web/Console Management Interfaces (refer to
[System]->[Configuration] in Web or [Routing] configurations in the Console). After the modifications, the
system must be warm started in order for the new values to take effective. Such modifications need to be
done on each device that joins to the same routing group. In other words, they must use the same range of
ports in order to communicate with each other.