Yealink T27P Administrator's Guide

Administrator’s Guide for SIP-T2_Series_T4_Series IP Phones
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2. Select the desired value from the pull-down list of CNG.
3. Click Confirm to accept the change.
Jitter buffer is a shared data area where voice packets can be collected, stored, and
sent to the voice processor in even intervals. Jitter is a term indicating variations in
packet arrival time, which can occur because of network congestion, timing drift or
route changes. The jitter buffer, located at the receiving end of the voice connection,
intentionally delays the arriving packets so that the end user experiences a clear
connection with very little sound distortion. IP phones support two types of jitter buffers:
fixed and adaptive. A fixed jitter buffer adds the fixed delay to voice packets. You can
configure the delay time for the static jitter buffer on IP phones. An adaptive jitter buffer
is capable of adapting the changes in the network's delay. The range of the delay time
for the dynamic jitter buffer added to packets can be also configured on IP phones.
Procedure
Jitter buffer can be configured using the configuration files or locally.
Configuration File
<y0000000000xx>.cfg
Configure the mode of
jitter buffer and the delay
time for jitter buffer.
Parameters:
voice.jib.adaptive
voice.jib.min
voice.jib.max
voice.jib.normal
Local
Web User Interface
Configure the mode of
jitter buffer and the delay
time for jitter buffer.

Yealink T27P Specifications

General

Wall Mountable	Yes
Local Phonebook	1000 entries
Bluetooth	No
Wi-Fi	No
Gigabit Ethernet	No
Display	3.66" 240x120 pixel graphical LCD with backlight
Audio Features	HD voice, Full-duplex speakerphone
Network	Dual-port 10/100 Ethernet switch
Protocols	SIP v1 (RFC2543), v2 (RFC3261)
Power	IEEE 802.3af PoE
Connectivity	2 x RJ45 10/100M Ethernet ports
Voice Codecs	G.711(A/μ), G.722, G.723, G.729AB, G.726
EHS	Supports EHS with Plantronics headsets
Headset Port	Yes
Power Adapter	5V DC (optional)