Topcom ATA 1110 - Manual (Page 7)

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Step 2 : Configuration
2.4 NAT Traversal
If the ATA 1110 is connected behind a router it is
recommended to enable the STUN settings.
Your SIP provider should be able to provide this information.
Enter the Advance - SIP setting page.
• STUN Server Addr:enter the STUN server addres
• STUN Server Port:enter the STUN server port number
• Check "Enable SIP Stun"
Click Apply to confirm the settings.
Go to the Config Manage - Save Config page and
click "save" to save the configuration, otherwise you
will lose the setting after the ATA reboots.