Yealink SIP-T48G Administrator's Guide

Configuring Advanced Features
631
If NAT is disabled, the port number shows in the Via and Contact SIP headers of SIP
messages. If NAT is enabled, the phone uses the NAT port number (and NAT IP address)
in the Via and Contact SIP headers of SIP messages, but still use the configured source
port.
Procedure
NAT traversal and STUN server can be configured using the configuration files or locally.
Configuration File
<y0000000000xx>.cfg
Configure NAT traversal and
STUN server on a phone basis.
Parameters:
sip.nat_stun.enable
sip.nat_stun.server
sip.nat_stun.port
Configure local SIP port and TLS
SIP port.
Parameters:
sip.listen_port
sip.tls_listen_port
<MAC>.cfg
Configure NAT traversal on a
per-line basis.
Parameters:
account.X.nat.nat_traversal
Local
Web User Interface
Configure NAT traversal and
STUN server on a phone basis.
Navigate to:
http://<phoneIPAddress>/servl
et? p=network-adv&q=load
Configure local SIP port and TLS
SIP port.
Navigate to:
http://<phoneIPAddress>/servl
et?p=settings-sip&q=load
Configure NAT traversal on a
per-line basis.
Navigate to:
http://<phoneIPAddress>/servl
et?p=account-register&q=load
&acc=0

Yealink SIP-T48G Specifications

General

Expansion module support	Yes
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Volume control	-
Display diagonal	7 \
Display resolution	800 x 480 pixels
Lines quantity	- lines
Phonebook capacity	1000 entries
Number of VoIP accounts	6
AC adapter input voltage	100 - 240 V
Number of handles included	1 pc(s)

Weight and Dimensions

Width	266 mm
Height	185 mm