Administrator’s Guide for W60P/W53P/W41P DECT Phones
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You can also configure 180 ring workaround which defines whether to deal with the 180 message received after the 183
message. When the caller receives a 183 message, it suppresses any local ringback tone and begins to play the media
received. 180 ring workaround allows IP phones to resume and play the local ringback tone upon a subsequent 180
message received.
Topic
Early Media Configuration
Early Media Configuration
The following table lists the parameters you can use to configure the early media.
Parameter phone_setting.is_deal180 <y0000000000xx>.cfg
Description It enables or disables the IP phone to deal with the 180 SIP message received after the 183 SIP message.
Permitted
Values
0-Disabled
1-Enabled, the IP 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
Acoustic Clarity Technology
To optimize the audio quality of your network, Yealink IP phones support the acoustic clarity technology: Background
Noise Suppression (BNS), Automatic Gain Control (AGC), Voice Activity Detection (VAD), Comfort Noise Generation
(CNG) and jitter buffer.
Topics
Background Noise Suppression (BNS)
Automatic Gain Control (AGC)
Voice Activity Detection (VAD)
Comfort Noise Generation (CNG)
Jitter Buffer
Background Noise Suppression (BNS)
Background noise suppression (BNS) is designed primarily for hands-free operation and reduces background noise to
enhance communication in noisy environments.
Automatic Gain Control (AGC)
Automatic Gain Control (AGC) is applicable to the hands-free operation and is used to keep audio output at nearly a
constant level by adjusting the gain of signals in some circumstances. This increases the effective user-phone radius
and helps with the intelligibility of soft-talkers.
Voice Activity Detection (VAD)
VAD can avoid unnecessary coding or transmission of silence packets in VoIP applications, saving on computation and
network bandwidth.
Topic
VAD Configuration
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