Administrator’s Guide for SIP-T2xP IP Phones
414
NAT Traversal
NAT traversal is a general term for techniques that establish and maintain IP
connections traversing NAT gateways, typically required for client-to-client networking
applications, especially for VoIP deployments. STUN is one of the NAT traversal
techniques supported by IP phones.
STUN (Simple Traversal of UDP over NATs)
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
applications to operate behind a NAT to discover the presence of the network address
translator, 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 act 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.
The NAT traversal and STUN server are configurable on a per-line basis.
Procedure
NAT traversal and STUN server can be configured using the configuration files or locally.
Configuration File
<MAC>.cfg
Configure NAT traversal and STUN
server on the IP phone.
Parameters:
account.X.nat.nat_traversal
account.X.nat.stun_server
account.X.nat.stun_port
Local
Web User Interface
Configure NAT traversal and STUN
server on the IP phone.
Navigate to:
http://<phoneIPAddress>/servlet?p
=account-register&q=load&acc=0
Details of Configuration Parameters:
Parameters
Permitted Values
Default
account.X.nat.nat_traversal
0 or 1
0
Description:
Enables or disables the NAT traversal for account X.
0-Disabled
Summary of Contents for SIP-T2XP
Page 1: ......
Page 28: ...Administrator s Guide for SIP T2xP IP Phones 10 ...
Page 66: ...Administrator s Guide for SIP T2xP IP Phones 48 ...
Page 280: ...Administrator s Guide for SIP T2xP IP Phones 262 ...
Page 456: ...Administrator s Guide for SIP T2xP IP Phones 438 ...
Page 494: ...Administrator s Guide for SIP T2xP IP Phones 476 ...
Page 524: ...Administrator s Guide for SIP T2xP IP Phones 506 ...