Yealink SIP-T21 E2

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
856
Codec
Algorithm
Reference
Bit Rate
Sample
Rate
Packetization
Time
13.33 Kbps
30ms
opus
opus
RFC 6716
16 Kbps
20 Kbps
8 Ksps
16 Ksps
20ms
Note
The corresponding attributes of the codec are listed as follows:
Codec
Configuration
Methods
Priority
RTPmap
G722
Configuration Files
Web User Interface
1
9
PCMU
Configuration Files
Web User Interface
2
0
PCMA
Configuration Files
Web User Interface
3
8
G729
Configuration Files
Web User Interface
4
18
G723_53
(not applicable to SIP-
T40P/T40G/T27P/T23P/T
23G/T21(P) E2/T19(P) E2)
Configuration Files
Web User Interface
0
4
G723_63
(not applicable to SIP-
T40P/T40G/T27P/T23P/T
23G/T21(P) E2/T19(P) E2)
Configuration Files
Web User Interface
0
4
G726-16
Configuration Files
Web User Interface
0
103
G726-24
Configuration Files
Web User Interface
0
104
G726-32
Configuration Files
Web User Interface
0
102
G726-40
Configuration Files
0
105
The network bandwidth necessary to send the encoded audio is typically 5~10% higher than the
bit rate due to packetization overhead. For example, a two-way G.722 audio call at 64 Kbps
consumes about 135 Kbps of network bandwidth.