Yealink SIP-T33P Administrator's Guide

Administrator’s Guide for SIP-T2 /T3 /T4 /T5 /CP920 IP Phones
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Acoustic Clarity Technology
To optimize the audio quality in your network, Yealink phones support the acoustic clarity technology: Acoustic
Echo Cancellation (AEC), Background Noise Suppression (BNS), Automatic Gain Control (AGC), Voice Activity
Detection (VAD), Comfort Noise Generation (CNG) and jitter buffer.
Topics
Acoustic Echo Cancellation (AEC)
Noise Suppression
Background Noise Suppression (BNS)
Automatic Gain Control (AGC)
Voice Activity Detection (VAD)
Comfort Noise Generation (CNG)
Jitter Buffer
Smart Noise Block
Acoustic Shield
Smart Noise Filtering
Acoustic Echo Cancellation (AEC)
Yealink phones employ advanced AEC for hands-free operation. You can configure the AEC feature to remove the
echo of the local loudspeaker from the local microphone without removing the near-end speech.
AEC is not normally required for calls via the handset. In some cases, where echo is experienced by the remote
party, AEC may be used to reduce/avoid echo when you use the handset.
Note: Utilizing acoustic echo cancellation will introduce a small increase of delay into an audio path which might cause a
lower voice quality.
Topic
AEC Configuration
AEC Configuration
The following table lists the parameter you can use to configure AEC.
Parameter
voice.echo_cancellation <y0000000000xx>.cfg
Description
It enables or disables the AEC (Acoustic Echo Canceller) feature.
Permitted
Values
0-Disabled
1-Enabled
Default
1
Web UI
Settings > Voice > Echo Cancellation > ECHO
Noise Suppression
The impact noise in the room is picked-up, including paper rustling, coffee mugs, coughing, typing, and silverware
striking plates. These noises, when transmitted to remote participants, can be very distracting.
You can enable the Noise Suppression feature to suppress these noises.
It is only applicable to CP920 phones.
Topic
Noise Suppression Configuration
Noise Suppression Configuration
The following table lists the parameter you can use to configure noise suppression.

Yealink SIP-T33P Specifications

General

Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Gray
Wall mountable	Yes
Operating system installed	Linux
Lines quantity	4 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	4
Volume control	Buttons
Number of function keys	5
Display diagonal	2.4 \
Display resolution	320 x 240 pixels
Voice codecs	AGC, AJB, CNG, G.711a, G.711u, G.722, G.723.1, G.726, G.729, G.729A, PLC, VAD, iLBC
Security algorithms	AES, HTTPS
Ethernet LAN data rates	10, 100 Mbit/s
Ethernet LAN interface type	Fast Ethernet
RJ-9 ports quantity	1
Ethernet LAN (RJ-45) ports	2
Input frequency	50/60 Hz
AC adapter input voltage	100 - 240 V
Power consumption (typical)	3 W
Power consumption (Power over Ethernet (PoE))	5 W
Number of handles included	1 pc(s)
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %

Weight and Dimensions

Depth	186 mm
Width	212 mm
Height	146 mm