User's Manual

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2. In some special situations, phones under same local network could not set up connection
successfully when STUN is enabled. Because some NATs would refuse to transmit data packets on two
binding ports over NAT. So default setting of STUN is disabled. STUN could be enabled by web user
interface or importing configuration file.
Configuration method:
1. Web user interface
1) ClickLine/Basic Settings ’.
2) Modify the field STUN Settings/ Server Addresswith domain name of STUN sever or IP address.
3) Click theApplybutton to save the change.
4) Click Line/SIP/Advanced Settingswhen Line 1 needs to use STUN to do NAT Traversal.
5) Make sure that use STUNcheckbox is checked.
6) Click the Applybutton to save the change.
Here is an example:
2. Items in configuration file
There are also two parts in configuration file for STUN, common configuration and line configuration.
1) Common configuration
Parameters Descriptions
STUN Server : Configure Domain or IP address of STUN server.
Default value is empty.
STUN Port :
Configure STUN server port, default is 3478
STUN Refresh Time :
Configure STUN request sending period by