Supplemental Guide – DOC. 8412A
UC-P100-S/UC-P110-S Phones for Skype for Business
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Codec
Algorithm
Reference
Bitrate
Sample Rate
Packetization Time
G729
G.729
RFC 3551
8 Kbps
8 Ksps
20ms
G726-16
G.726
RFC 3551
16 Kbps
8 Ksps
20ms
G726-24
G.726
RFC 3551
24 Kbps
8 Ksps
20ms
G726-32
G.726
RFC 3551
32 Kbps
8 Ksps
20ms
G726-40
G.726
RFC 3551
40 Kbps
8 Ksps
20ms
G723_53/
G723_63
G.723.1
RFC 3551
5.3kbps
6.3kbps
8 Ksps
30ms
iLBC
iLBC
RFC 3952
15.2 Kbps
13.33 Kbps
8 Ksps
20ms 30ms
SILK_NB
SILK_NB
draft-vos-
silk-01
12 Kbps
8 Ksps
20ms
SILK_WB
SILK_WB
draft-vos-
silk-01
20 Kbs
16 Ksps
20ms
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. Ptime
negotiation can also be disabled.
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:
Codec Attributes
Codec
Configuration
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
Configuration Files
Web User Interface
0
4
G723_63
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