Yealink SIP-T48U Administrator's Guide

Audio Features
172
Description
It configures the time to wait for the phone to play the local ringback tone when the early media cannot
be played.
Permitted
Values
-1-Do not play the local ringback tone
0-Play the local ringback tone immediately
1-100-Wait for a specified time to play the local ringback tone
Default
1
Parameter
phone_setting.is_deal180 <y0000000000xx>.cfg
Description
It enables or disables the phone to deal with the 180 SIP message received after the 183 SIP mes-
sage.
Permitted
Values
0-Disabled
1-Enabled, the phone will resume and play the local ringback tone upon a subsequent 180 message
received.
Default
1
Web UI
Features > General Information > 180 Ring Workaround
Parameter
phone_setting.change_183_to_180 <y0000000000xx>.cfg
Description
It enables or disables the phone to handle the received second 183 message as the 180 message.
Permitted
Values
0-Disabled
1-Enabled, the phone will play the early media first and play the local ringback tone when receiving
the second 183 message.
Default
0
[1]
If you change this parameter, the phone will reboot to make the change take effect.
Headset Prior
Headset prior allows users to use headset preferentially if a headset is physically connected to the IP phone. This
feature is especially useful for permanent or full-time headset users.
It is not applicable to CP920 phones.
Note: It is not applicable to the Bluetooth headset and USB headset.
Topic
Headset Prior Configuration
Headset Prior Configuration
The following table lists the parameters you can use to configure the headset prior.
Parameter
features.headset_prior <y0000000000xx>.cfg
Description
It enables or disables to preferentially use the headset mode for all incoming and outgoing calls.
Note: It works only if “features.headset_mode.enable” is set to 1 (Enabled).
Permitted
Values
0-Disabled, the headset mode will be deactivated after the call, if you switch the headset mode to
speakerphone/handset mode.
1-Enabled, the headset mode will not be deactivated after the call, even if you switch the headset
mode to speakerphone/handset mode.

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