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M2M Cellular Gateway
Following table lists the parameter configuration as an example for the gateway in
above diagram with one special application rule to be defined.
Use default value for those parameters that are not mentioned in the table.
Configuration Path
ID
Trigger Port
Incoming Ports
Rule
Scenario Operation Procedure
In above diagram, the Gateway is the gateway of Network‐A and the subnet of its
Intranet is 10.0.75.0/24. The gateway has the IP address of 10.0.75.2 for LAN interface
and 118.18.81.33 for WAN interface. It serves as a NAT router.
Define a special application rule with the trigger port 554 (Quick Time 4) and incoming
ports 6970‐6999, and activate the rule.
So, the local user at host with IP address 10.0.75.100 can enjoy the music by using Quick
Time 4 application. The media server is in the Internet.
ALG Configuration
This gateway supports the SIP ALG feature to allow one SIP phone behind the NAT gateway can
call another SIP phone in the Internet, even the gateway executes its NAT mechanism between the
Intranet and the Internet. The NAT gateway monitors the control traffic and open up port mappings
(firewall pinhole) dynamically as required to know about an address/port number combination that
allows incoming packets, so it will support address and port translation for SIP application layer
"control/data" protocols as shown in following diagram. The NAT Gateway enables the SIP ALG feature,
so it will monitor the SIP Phone #1 actions, open up the required ports and make the address and port
translation in a SIP voice communication.
Index skipping is used to reserve slots for new function insertion, when required.
[Special AP & ALG]‐[Special AP List]
1
554 (Quick Time 4)
6970‐6999
■ Enable
101
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