Advanced SIP Settings

Changing values on this page requires in-depth knowledge!

Press Get default values to restore all settings on this page to factory defaults.

:!: The Internet Gate is pre-configured to be SIP-transparent, allowing SIP traffic to effortlessly pass through the firewall. You do not need to tweak or configure the settings if all you want is getting simple SIP traffic through the firewall. Below settings are for additional functionality besides basic transparency.

:!: Turn off ICE, STUN, uPnP and other “tricks” that your SIP client's try to use to get through ordinary firewalls. As the Internet Gate is SIP transparent such “tricks” are harmful and unnecessary - and might even actually stop SIP traffic from getting through the firewall!

Far End NAT Traversal (FENT)

The Internet Gate can enable SIP connectivity for remote users that use NAT devices without SIP support. It can adapt to characteristics of remote NAT devices.

FENT sends keep-alive packets to remote SIP clients behind non-SIP-capable firewalls to keep the SIP communications channel free to them.