Installation and Maintenance Manual
Avaya B179 SIP Conference Phone Installation and Administration Guide
19
STUN STUN (Simple Traversal of UDP through NATs) is a protocol that
assists devices behind a NAT rewall or router with their packet
routing. STUN is commonly used in real-time voice, video, messag-
ing, and other interactive IP communication applications..
The protocol allows applications operating through a NAT to discov-
er the presence and specic type of NAT and obtain the mapped
(public) IP address (NAT address) and port number that the NAT
has allocated for the application’s User Datagram Protocol (UDP)
connections to remote hosts. The protocol requires assistance from
a 3rd-party network server (STUN server).
STUN should be activated if an external SIP server cannot connect
to the Avaya B179 behind a rewall NAT function and the SIP
server supports STUN. A suitable STUN server is usually provided
by the VoIP service provider.
Note: STUN might also be referred to as Session Traversal Utilities
for NAT.
STUN host The IP address or public name of the STUN server.
Offer ICE ICE (Interactive Connectivity Establishment), is a STUN addition
that provides various techniques to allow SIP-based VoIP devices to
successfully traverse the variety of rewalls that may exist between
the devices. The protocol provides a mechanism for both endpoints
to identify the most optimal path for the media trafc to follow.
TURN TURN (Traversal Using Relay NAT) TURN is an extension of the
STUN protocol that enables NAT traversal when both endpoints are
behind symmetric NAT. With TURN, media trafc for the session
will have 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 trafc, TURN is normally used as a
last resort when endpoints cannot communicate directly.
TURN User User authentication name on the TURN server.
TURN host The IP address or public name of the TURN server.
Password User authentication password on the TURN server.
On phone: > SETTINGS > ADVANCED > (PIN) > NAT TRAVERSAL (6,2,3).
Advanced
Enable SIP Replaces Default is Yes. Setting this option to No, will instruct the PBX not
to use the SIP replace header. Some PBXes try to take over the
bridging functionality from Avaya B179 using this command, which
causes the calls to interrupt.
SETTINGS