Yealink SIP-T48S User Manual

User Guide for the SIP-T48S IP Phone
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If the forward on code or off code is configured, the IP phone sends the corresponding code to
the server when a certain action takes place. For example, if you set the Always Forward on code
to be *71 (may vary on different servers), and the target number to be 1234. When you enable
Always Forward on the IP phone, the IP phone sends *711234 to the server, and then the server
will enable Always Forward feature on the server side, hence being able to get the right status of
the extension.
Call forward is configurable via web user interface at the path Features->Forward&DND.
Note
To configure the forward authorized numbers via web user interface:
1. Click on Features->Forward&DND.
2. Select Enabled from the pull-down list of Forward Emergency.
3. Enter the numbers in the Forward Authorized Numbers field.
For multiple numbers, enter a comma between every two numbers.
4. Click Confirm to accept the change.
When call forward is enabled on the phone, the phone cannot forward incoming calls from the
numbers specified in the Forward Authorized Numbers field.
Note
You can also enter the SIP URL or IP address in the Forward to field. For more information on
using the SIP URL or IP address, refer to Placing Calls on page 132.
Call forward is local to the phone, and may be overridden by the server settings. Call forward on
code or off code may be different among servers. For more information, contact your system
administrator.
Forward authorized number is configurable via web user interface only.

Yealink SIP-T48S Specifications

General

Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Keypad illumination	Yes
Display diagonal	7 \
Display resolution	800 x 480 pixels
AC adapter input voltage	100 - 240 V
AC adapter output current	2 A
AC adapter output voltage	5 V
USB 2.0 ports quantity	1
Ethernet LAN (RJ-45) ports	2
Front camera	No
Voice codecs	CNG, G.711Mu, G.711a, G.722, G.723.1, G.726, G.729ab, VAD, iLBC
Lines quantity	16 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	16
Dual-Tone Multi-Frequency (DTMF) modes	In-band, Out-of band, SIP info
Keypad number of keys	42
Security algorithms	AES
Networking standards	IEEE 802.3af
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN interface type	Gigabit Ethernet
Supported network protocols	SIP v1, SIP v2, LLDP/CDP/DHCP, OpenVPN, IEEE802.1X, IPv6, HTTPS
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %
Cables included	LAN (RJ-45)
Number of handles included	1 pc(s)
Harmonized System (HS) code	85171800

Weight and Dimensions

Depth	225 mm
Width	266 mm
Height	185 mm
Package depth	263 mm
Package width	324 mm
Package height	128 mm