Yealink VC110, Administrator'S Manual

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Administrator‘s Guide for Yealink VC110 Video Conferencing Endpoint
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To configure static NAT via the remote control:
1. Select Menu->Advanced (default password: 0000) ->NAT/Firewall.
2. Select the desired value from the pull-down list of Type.
3. Configure the NAT public address in the Public IP Address field if Manual Settings is
selected from the pull-down list of Type.
4. Press the Save soft key to accept the change.
To configure static NAT for SIP IP call via the remote control:
1. Select Menu->Advanced (default password: 0000) ->SIP IP Call.
2. Select StaticNat from the pull-down list of NAT_Traversal.
3. Press the Save soft key to accept the change.
STUN is a network protocol, used in NAT traversal for applications of real-time voice,
video, messaging, and other interactive IP communications. The STUN protocol allows
entities behind a NAT to first discover the presence of a NAT and the type of NAT (for
more information on the NAT types, refer to
NAT Types on page 97 .) and to obtain the
mapped (public) IP address and port number that the NAT has allocated for the UDP
connections to remote parties. The protocol requires assistance from a third-party
network server (STUN server) usually located on public Internet. The IP phone can be
configured to work as a STUN client, to send exploratory STUN messages to the STUN
server. The STUN server uses those messages to determine the public IP address and
port used, and then informs the client. For more information, refer to
RFC3489 .
Capturing packets after you enable the STUN feature, you can find that the VC110 video
conferencing endpoint sends Binding Request to the STUN server, and then mapped IP
address and port is placed in the Binding Response: Binding Success Response
MAPPED-ADDRESS: 59.61.92.59:19232.