Yealink T46G Administrator's Manual page 297

T40P
The following table summarizes the supported audio codecs on Skype for Business phones:
Codec Algorithm
G722 G.722
PCMA G.711 a-law
PCMU G.711 u-law
G729 G.729
G726-16 G.726
G726-24 G.726
G726-32 G.726
G726-40 G.726
G723_53/
G.723.1
G723_63
iLBC iLBC
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:
Codec Configuration Methods
Configuration Files
G722
Web User Interface
PCMU Configuration Files
G726-40, iLBC, G723_53,
G723_63
G722, PCMA, PCMU, G729,
G726-16, G726-24, G726-32,
G726-40, iLBC
Reference Bit Rate
RFC 3551 64 Kbps
RFC 3551 64 Kbps
RFC 3551 64 Kbps
RFC 3551 8 Kbps
RFC 3551 16 Kbps
RFC 3551 24 Kbps
RFC 3551 32 Kbps
RFC 3551 40 Kbps
5.3kbps
RFC 3551
6.3kbps
15.2 Kbps
RFC 3952
13.33 Kbps
Priority
1
2
Configuring Audio Features
G722, PCMA, PCMU,
G729
Sample Packetization
Rate Time
20ms
16 Ksps
8 Ksps 20ms
20ms
8 Ksps
20ms
8 Ksps
20ms
8 Ksps
20ms
8 Ksps
20ms
8 Ksps
20ms
8 Ksps
8 Ksps 30ms
20ms
8 Ksps
30ms
RTPmap
9
0
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