Yealink SIP-T21 E2 Administrator's Guide

Configuring Audio Features
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The following table summarizes the valid values of ptime for each audio codec:
Codec
Packetization Time
(Minimun)
Packetization Time (Maximun)
G.722.1c
20ms
60ms
G.722.1c
20ms
60ms
G.722.1c
20ms
60ms
G.722.1
20ms
60ms
G722
10ms
40ms
PCMA
10ms
40ms
PCMU
10ms
40ms
G729
10ms
80ms
G726-16
10ms
30ms
G726-24
10ms
30ms
G726-32
10ms
30ms
(40ms for SIP-
T40P/T40G/T23P/T23G/T21(P)
E2/T19(P) E2)
G726-40
10ms
30ms
G723_53/
G723_63
30ms
60ms
iLBC
20ms
30ms
opus
10ms
20ms
Procedure
PTime can be configured using the following methods.
Central Provisioning
(Configuration File)
<MAC>.cfg
Configure the ptime.
Parameter:
account.X.ptime
Web User Interface
Configure the ptime.
Navigate to:
http://<phoneIPAddress>/servlet?p=
account-adv&q=load&acc=0

Yealink SIP-T21 E2 Specifications

General

Brand	Yealink
Model	SIP-T21 E2
Category	IP Phone
Language	English