Yealink SIP-T48U Administrator's Guide

Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
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Sending Volume Configuration
You can configure the sending volume of currently engaged audio devices (handset, speakerphone or headset)
when the phone is in use.
The following table lists the parameters you can use to configure the sending volume.
Parameter
voice.handfree_send
[1]
<y0000000000xx>.cfg
Description
It configures the sending volume of the speaker.
Note: We recommend that you modify this parameter cautiously. An unsuitable value may render the
voice quality bad.
Permitted
Values
Integer from -50 to 50
Default
0
Web UI
Features > Audio > Handfree Send Volume (-50~50)
Parameter
voice.handfree.autoreset_spk_vol <y0000000000xx>.cfg
Description
It configures the speaker's volume level during a call.
Permitted
Values
0-The speakerphone volume at the end of a call persists between calls.
1 to 15-The speakerphone volume does not persist between calls, and resets to this specified level
each new call.
Default
0
Parameter
voice.handset_send
[1]
<y0000000000xx>.cfg
Description
It configures the sending volume of the handset.
Note: We recommend that you modify this parameter cautiously. An unsuitable value may render the
voice quality bad.
Permitted
Values
Integer from -50 to 50
Default
0
Supported
Devices
All phones except CP920
Web UI
Features > Audio > Handset Send Volume (-50~50)
Parameter
voice.handset.autoreset_spk_vol <y0000000000xx>.cfg
Description
It configures the handset's volume level during a call.
Permitted
Values
0-The handset volume at the end of a call persists between calls.
1 to 15-The handset volume does not persist between calls, and resets to this specified level each
new call.
Default
0
Supported
Devices
All phones except CP920
Parameter
voice.headset_send
[1]
<y0000000000xx>.cfg
Description
It configures the sending volume of the headset.
Note: We recommend that you modify this parameter cautiously. An unsuitable value may render the
voice quality bad.

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