Yealink SIP-T38G Administrator's Guide

Configuring Advanced Features
169
allows applications to operate behind a NAT to discover the presence of the network
address translator, and 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, which sends
exploratory STUN messages to the STUN server. The 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-account basis.
Procedure
NAT traversal and STUN server can be configured using the configuration files or locally.
Configuration File
<MAC>.cfg
Configure the NAT traversal
and STUN server on the IP
phone.
For more information, refer to
Network Address Translation on
page 297.
Local
Web User Interface
Configure the NAT traversal
and STUN server on the IP
phone.
Navigate to:
http://<phoneIPAddress>/cgi-bi
n/cgiServer.exx?page=Account
.htm&acc=<x>
For T38G, x ranges from 0 to 5.
For T32G, x ranges from 0 to 2.
To configure the NAT traversal and STUN server via web user interface:
1. Click on Account->Basic.
2. Select the desired account from the pull-down list of Account.
3. Select STUN from the pull-down list of NAT Traversal.

Yealink SIP-T38G Specifications

General

Expansion module support	Yes
Ethernet LAN (RJ-45) ports	2
Keypad number of keys	48
Touchscreen	-
Display resolution	480 x 272 pixels
Display number of colors	16.78 million colors
Lines quantity	- lines
Phonebook capacity	1000 entries
Number of VoIP accounts	6
Voice codecs	G.711, G.722, G.723.1, G.726
Bluetooth	No
Security algorithms	802.1x RADIUS, HTTPS, SSL/TLS
AC adapter input voltage	100 - 240 V
AC adapter output voltage	5 V
Power consumption (typical)	4.6 W
Operating relative humidity (H-H)	10 - 95 %
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Compliance industry standards	IEEE 802.3af
Number of handles included	1 pc(s)

Weight and Dimensions

Depth	204 mm
Width	273 mm
Height	42 mm
Weight	1050 g