Yealink SIP-T48U Administrator's Guide

Audio Features
148
Touch Tone
If you enable touch tone and tap the keys (except the off-hook key), the phone will produce a sound when it is not
on the dialing/pre-dialing screen and not in a call.
It is only applicable to CP920 phones.
Topic
Touch Tone Configuration
Touch Tone Configuration
The following table lists the parameter you can use to configure the touch tone.
Parameter
features.touch_tone <y0000000000xx>.cfg
Description
It enables or disables the touch tone.
Permitted
Values
0-Disabled
1-Enabled, when you tap the keys (except the Off-hook key), the phone will produce a sound when it
is not on the dialing/pre-dialing screen and not in a call.
Default
1
Supported
Devices
CP920
Web UI
Features > Audio > Touch Tone
Ring Tones
Ring tones are used to play for incoming calls. You can select a built-in ring tone or a custom ring tone for the
phone system or specific line registration. To set the custom ring tones, you need to upload the custom ring tones to
the IP phone in advance.
You can also specify a period of time after which the phone will stop ringing if the call is not answered.
Topics
Custom Ringtone Limit
Ringtone Configuration
Custom Ringtone Limit
The ring tone format must meet the following:
Phone Model Format Single File Size
T57W/T54W/T48U/T48S/T46U/T46S .wav <=8MB
T48G/T46G/T29G .wav
<=8MB (2.4MB of space should be
reserved for the phone)
T53W/T53/T43U/T42U/T42S/T41S/T42G/T41P/T40P/T40G
/T27G/T23P/T23G/T21(P) E2/T19(P) E2/CP920
.wav <=100KB
Note: The ring tone file must be in PCMU/PCMA audio format, mono channel, 8K sample rate, and 16-bit resolution.

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