Yealink SIP-T4U Series User Manual

Table of Contents
5
Custom Handset Related Configurations
143
Handset Firmware Upgrade Configuration
144
Audio Features
146
Alert Tone
146
Alert Tone Configuration
146
Touch Tone
148
Touch Tone Configuration
148
Ring Tones
148
Custom Ringtone Limit
148
Ringtone Configuration
149
Distinctive Ring Tones
151
Supported Alert-Info Headers Format
151
Alert-Info: Bellcore-drN
151
Alert-Info: ringtone-N/Alert-Info: ringtone-RingN.wav (or Alert-Info: MyMelodyN/Alert-Info:
MyMelodyRingN.wav) 152
Alert-Info: <URL >
153
Alert-Info: info=info text;x-line-id=0
154
Distinctive Ring Tones Configuration
154
Ringer Device
155
Ringer Device Configuration
156
Audio Volume
156
Ringer Volume Configuration
156
Sending Volume Configuration
157
Tones
159
Supported Tones
159
Tones Configuration
160
Audio Codecs
165
Supported Audio Codecs
165
Audio Codecs Configuration
167
Packetization Time (PTime)
170
Supported PTime of Audio Codec
170
PTime Configuration
171
Early Media
171
Early Media Configuration
171
Headset Prior
172
Headset Prior Configuration
172
Dual Headset
173
Dual Headset Configuration
173
Acoustic Clarity Technology
173
Acoustic Echo Cancellation (AEC)
174
AEC Configuration
174
Noise Suppression
174
Noise Suppression Configuration
174
Background Noise Suppression (BNS)
175
Automatic Gain Control (AGC)
175

Yealink SIP-T4U Series Specifications

General

Brand	Yealink
Model	SIP-T4U Series
Category	IP Phone
Language	English