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Setting Port Filtering Rules for cellular routers  Port rules are used to block or allow traffic through an interface based on port number, direction and protocol. For example, if a rule in the firewall exists to block incoming telnet access, then the firewall will block the IP protocol for port number 23 fro all ingress traffic. So each packet passing through the firewall is filtered on a protocol/port number basis, and accepted or rejected based on user-defined packet filtering rules. This can be used to allow custom on box services , or block traffic based on policy. To setup a port rule:
Interface: Dialout/Cellular Port Range: 22 Protocol: TCP Direction: Egress Action: Block 
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