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SIP Operation Manual
NAT/DDNS
NAT Traversal
If the gateway is set up behind an Internet sharing device, you can select either the NAT or STUN
protocol.
NAT Public IP: The IP address used by the gateway should be a private address.
Furthermore, users must set the Virtual Server Mapping in the Internet sharing device.
(For example, a virtual server is usually defined as a Service Port, and all requests to this
port will be redirected to this specified the server’s private IP address).
The default port is listed below:
Listen Port (UDP): 5060
RTP Starting Port (UDP): 9000~ (Listen Port used for telephone communication).
Port of Web Access from WAN (TCP): The number you set in this option on the Network
Settings page.
NAT IP/Domain: Enter the NAT Server IP address (real public IP address of the Internet
sharing device); or enter a true URL (Uniform Resource Locator) when DDNS is used.
Please refer to
DDNS
for further information.
NOTE: If you are setting a public IP in this field, it has to be a public IP, otherwise VoIP communication
may not be established properly.
Enable STUN Client: Using the STUN protocol prevents problems with setting the IP
sharing function, but some NATs do not support this protocol.
STUN Server IP/Domain and Port: Enter the STUN server IP address and Listen Port
number.
Enable UPnP Control Point: This variable will enable the gateway’s IP traffic to pass
through an Internet sharing device. This function only works when the Internet sharing
device supports UPnP and has it enabled.
NOTE: The “Status
Current Status” page will show the status of UPnP.
