Yealink SIP-T48U Administrator's Guide

Network Configurations
33
For T41P phones: SIP-T41P.
For T41S phones: SIP-T41S.
For T40P phones: SIP-T40P.
For T40G phones: SIP-T40G.
For T29G phones: SIP-T29G.
For T27G phones: SIP-T27G.
For T23P phones: SIP-T23P.
For T23G phones: SIP-T23G.
For T21(P) E2 phones: SIP-T21P_E2.
For T19(P) E2 phones: SIP-T19P_E2.
For CP920 phones: SIP-CP920.
Web UI
Features > General Information > DHCP Hostname
[1]
If you change this parameter, the phone will reboot to make the change take effect.
DHCP Option 120
DHCP option 120 is used by the SIP client to locate a SIP server or outbound proxy server.
Topic
DHCP Option 120 Configuration
DHCP Option 120 Configuration
The following table lists the parameter you can use to configure DHCP option 120.
Parameter
sip.dhcp.option120.mode <y0000000000xx>.cfg
Description
It configures whether to use DHCP option 120 for obtaining the outbound proxy server IP address.
Permitted
Values
0-Do not check with the DHCP server for the outbound proxy server IP address.
1-The value obtained from DHCP option 120 is used as outbound proxy server IP address (can
resolve up to two domain names or IPv4 addresses). If “account.X.outbound_proxy_enable = 1”, and
the primary outbound proxy server is configured, the address from DHCP option 120 is used as sec-
ondary one; if the primary outbound proxy server is not configured, the address from DHCP option
120 is used as the primary one.
2-The value obtained from DHCP option 120 is used as SIP server IP address (can resolve up to only
one IPv4 address). If the primary SIP server is configured, the address from DHCP option 120 is used
as secondary one; if the primary SIP server is not configured, the address from DHCP option 120 is
used as the primary one.
Default
0
DHCP Option 60
DHCP option 60 is used to indicate the vendor type. Servers can use option 43 to return the vendor-specific inform-
ation to the client.
You can set the DHCP option 60 type.
Topic
DHCP Option 60 Configuration

Yealink SIP-T48U Specifications

General

Handset type	Wired handset
Product type	IP Phone
Product color	Gray
USB 2.0 ports quantity	USB 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 support	Yes
Ethernet LAN (RJ-45) ports	2
Display diagonal	7 \
Display resolution	800 x 480 pixels
Lines quantity	- lines
Phonebook capacity	1000 entries
Number of VoIP accounts	16
Voice codecs	AGC, AJB, AMR-WB, CNG, G.711, G.722, G.723.1, G.726, G.729ab, VAD, iLBC
Security algorithms	AES, HTTPS, SRTP, TLS
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN interface type	Gigabit Ethernet
Front camera	-
AC adapter input voltage	100 - 240 V
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Keypad number of keys	29
Number of handles included	1 pc(s)
Harmonized System (HS) code	85171800

Weight and Dimensions

Width	226 mm
Height	185 mm