Yealink SIP-T2 SERIES Administrator's Manual page 817

Codec Algorithm
G726-16 G.726
G726-24 G.726
G726-32 G.726
G726-40 G.726
G723/
G.723.1
G723_53/
G723_63
iLBC iLBC
Opus Opus
Packetization Time
Ptime (Packetization Time) is a measurement of the duration (in milliseconds) of the
audio data in each RTP packet sent to the destination, and defines how much network
bandwidth is used for the RTP stream transfer. Before establishing a conversation, codec
and ptime are negotiated through SIP signaling. The valid values of ptime range from
10 to 60, in increments of 10 milliseconds. The default ptime is 20ms. You can also
disable the ptime negotiation.
Codecs and priorities of these codecs are configurable on a per-line basis. The attribute
―rtpmap‖ is used to define a mapping from RTP payload codes to a codec, clock rate
and other encoding parameters.
The corresponding attributes of the codec are listed as follows:
For SIP-T48G/T46G/T42G/T41P/T40P/T29G/T27P/T23P/T23G/T21(P) E2/T19(P) E2:
Codec
Configuration Files
G722
Web User Interface
Configuration Files
PCMU
Web User Interface
Configuration Files
PCMA
Web User Interface
Configuration Files
G729
Web User Interface
Reference Bit Rate
RFC 3551 16 Kbps
RFC 3551 24 Kbps
RFC 3551 32 Kbps
RFC 3551 40 Kbps
5.3 Kbps
RFC 3551
6.3 Kbps
15.2 Kbps
RFC 3952
13.33 Kbps
16 Kbps
RFC 6716
20 Kbps
Configuration
Methods
Configuring Audio Features
Sample Packetization
Rate
8 Ksps
8 Ksps
8 Ksps
8 Ksps
8 Ksps
8 Ksps
16 Ksps
Priority RTPmap
1 9
2 0
3 8
4 18
Time
20ms
20ms
20ms
20ms
30ms
20ms
30ms
20ms
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