Yealink SIP-T27G Administrator's Guide

Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
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are using the phone handset or a headset.
Permitted
Values
Integer from 1 to 3
Default
2
Supported
Devices
T57W, T54W, T53W, T53, T48U, T46U, T43U, T42U
Smart Noise Filtering
The phones can block out the slight noise from the far party when there is no speech in a call, and at the same time
filter out the common transient noise (door closing, table knocking, and so on).
Topic
Smart Noise Filtering Configuration
Smart Noise Filtering Configuration
The following table lists the parameter you can use to configure smart noise filtering.
Parameter
features.noise_filtering_rev.enable <y0000000000xx>.cfg
Description
It enables or disables the phone to block out the slight noise from the far end when there is no speech
in a call.
Note: After smart noise filtering is enabled, if the far end is playing music or calling a voice service, the
background music will also be eliminated when there is no speech in a call.
Permitted
Values
0-Disabled
1-Enabled
Default
0
Supported
Devices
T57W, T54W, T53W, T53, T48U, T46U, T43U, T42U, CP920
Web UI
Settings > Voice > Smart Noise Filtering > Smart Noise Filtering
DTMF
DTMF (Dual Tone Multi-frequency) tone, better known as touch tone. DTMF is the signal sent from the IP phone to
the network, which is generated when pressing the IP phone’s keypad during a call. Each key pressed on the IP
phone generates one sinusoidal tone of two frequencies. One is generated from a high-frequency group and the
other from a low-frequency group.
Topics
DTMF Keypad
Transmitting DTMF Digit
Suppress DTMF Display
Transfer via DTMF
Local DTMF Tone
DTMF Keypad
The DTMF keypad is laid out in a 4×4 matrix, with each row representing a low frequency, and each column rep-
resenting a high frequency. Pressing a digit key (such as '1') will generate a sinusoidal tone for each of two fre-
quencies (697 and 1209 hertz (Hz)).
DTMF Keypad Frequencies:

Yealink SIP-T27G Specifications

General

Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Black, Gold
Wall mountable	Yes
Display diagonal	3.66 \
Display resolution	240 x 120 pixels
RJ-9 ports quantity	2
USB 2.0 ports quantity	1
Voice codecs	CNG, G.711, G.722, G.723.1, G.726, G.729, G.729ab, VAD, iLBC
Dual-Tone Multi-Frequency (DTMF) modes	SIP info
Lines quantity	8 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	6
Bluetooth	-
Security algorithms	AES, MD5
Networking standards	IEEE 802.1Q, IEEE 802.1p, IEEE 802.1x, IEEE 802.3af
Ethernet LAN interface type	Gigabit Ethernet
Volume control	Digital
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	210 mm
Width	265 mm
Height	170.5 mm