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Yealink SIP-T48U Administrator's Guide

Yealink SIP-T48U
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Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
54
Yealink phones support three NAT traversal techniques: manual NAT, STUN and ICE. If you enable manual NAT
and STUN, the phone will use the manually-configured external IP address for NAT traversal. The TURN protocol is
used as part of the ICE approach to NAT traversal.
The following table lists the parameters you can use to configure NAT traversal.
Parameter
account.X.nat.nat_traversal
[1]
<MAC>.cfg
Description
It enables or disables the NAT traversal for a specific account.
Note: If it is set to 1 (STUN), it works only if “static.sip.nat_stun.enable is set to 1 (Enabled); if it is set
to 2 (Manual NAT), it works only if “static.network.static_nat.enable is set to 1 (Enabled).
Permitted
Values
0-Disabled
1-STUN
2-Manual NAT
Default
0
Web UI
Account > Register > NAT
Phone UI
Color Screen Phones:
Menu > Advanced (default password: admin) > Accounts > Account X > NAT Status
Black-and-white Screen Phones:
Menu > Settings > Advanced Settings (default password: admin) > Accounts > AccountX > NAT Status
Note: Manual NAT cannot be configured via the phone user interface.
Parameter
static.network.static_nat.enable
[2]
<y0000000000xx>.cfg
Description
It enables or disables the manual NAT feature.
Permitted
Values
0-Disabled
1-Enabled
Default
0
Web UI
Network > NAT > Manual NAT > Active
Parameter
static.network.static_nat.addr <y0000000000xx>.cfg
Description
It configures the IP address to be advertised in SIP signaling.
It should match the external IP address used by the NAT device.
Note: It works only if “static.network.static_nat.enable is set to 1 (Enabled).
Permitted
Values
IP Address
Default
Blank
Web UI
Network > NAT > Manual NAT > IP Address
Parameter
static.sip.nat_stun.enable <y0000000000xx>.cfg
Description
It enables or disables the STUN (Simple Traversal of UDP over NATs) feature.
Permitted
Values
0-Disabled
1-Enabled
Default
0

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Yealink SIP-T48U Specifications

General IconGeneral
Handset typeWired handset
Product typeIP Phone
Product colorGray
USB 2.0 ports quantityUSB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
Expansion module supportYes
Ethernet LAN (RJ-45) ports2
Display diagonal7 \
Display resolution800 x 480 pixels
Lines quantity- lines
Phonebook capacity1000 entries
Number of VoIP accounts16
Voice codecsAGC, AJB, AMR-WB, CNG, G.711, G.722, G.723.1, G.726, G.729ab, VAD, iLBC
Security algorithmsAES, HTTPS, SRTP, TLS
Ethernet LAN data rates10, 100, 1000 Mbit/s
Ethernet LAN interface typeGigabit Ethernet
Front camera-
AC adapter input voltage100 - 240 V
Operating temperature (T-T)0 - 40 °C
Operating relative humidity (H-H)10 - 95 %
Keypad number of keys29
Number of handles included1 pc(s)
Harmonized System (HS) code85171800
Weight and Dimensions IconWeight and Dimensions
Width226 mm
Height185 mm

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