Konftel 800 Installation & Administration page 73

SETTINGS CONFIGURATION AND MANAGEMENT
Name
Enable STUN
STUN Server
Enable TURN
TURN Server
User
Description
To enable or disable the Simple Traversal of UDP through
the NAT (STUN) is a protocol that assists devices behind a
NAT firewall or router with their packet routing. STUN is
commonly used in real-time voice, video, messaging, and
other interactive IP communication applications. The
protocol allows applications operating through the NAT to
discover the presence and specific type of the NAT and
obtain a public IP address (NAT address) and port number
that the NAT allocated for the application User Datagram
Protocol (UDP) connections to remote hosts. You must
enable STUN if an external SIP server cannot connect to
the phone behind a firewall NAT function and the SIP server
supports STUN.
By default, the setting is disabled.
Another definition of STUN is the Session Traversal
Utilities for NAT.
To enter the IP address or the public name of the STUN
server.
To enable or disable the Traversal Using Relay NAT
(TURN). TURN is an extension of the TURN protocol that
enables NAT traversal when both endpoints are behind
symmetric NAT. With TURN, media traffic for the session
has to go to a relay server. Since relaying is expensive, in
terms of bandwidth that must be provided by the provider,
and additional delay for the media traffic, you must use
TURN as a last resort when endpoints cannot communicate
directly.
By default, the setting is disabled.
To enable TURN, you must enable ICE.
To enter the IP address or the public name of the TURN
server.
To specify the user authentication name on the TURN
server.
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