User Manual

Administrator’s Guide for SIP-T2xP and SIP-T19P IP Phones
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The corresponding attributes of the codec are listed as follows:
Codec
Configuration Methods
Priority
RTPmap
PCMU
Configuration Files
Web User Interface
1
0
PCMA
Configuration Files
Web User Interface
2
8
G729
Configuration Files
Web User Interface
3
18
G722
Configuration Files
Web User Interface
4
9
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
G726-40
Configuration Files
Web User Interface
0
105
iLBC
Configuration Files
Web User Interface
0
106
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.