Configuring Network
93
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
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 96.) 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.
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