Administrator’s Guide for VP59/SIP-T58A/CP960 IP Phones
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Packetization Time (PTime)
PTime is a measurement of the duration (in milliseconds) that how long the audio data in each RTP packet is sent
to the destination, and defines how much the network bandwidth is used for the RTP stream transfer. Before estab-
lishing 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.
Topics
Supported PTime of Audio Codec
PTime Configuration
Supported PTime of Audio Codec
The following table summarizes the valid values of ptime for each audio codec:
Codec
Packetization Time (Minimum)
Packetization Time (Maximum)
G.722.1c(48kb/s)
20ms
60ms
G.722.1c(32kb/s)
20ms
60ms
G.722.1c(24kb/s)
20ms
60ms
G.722.1(24kb/s)
20ms
60ms
G722
10ms
40ms
PCMA
10ms
40ms
PCMU
10ms
40ms
G729
10ms
80ms
G726-16
10ms
30ms
G726-24
10ms
30ms
G726-32
10ms
30ms
G726-40
10ms
30ms
G723_53/
G723_63
30ms
60ms
iLBC
20ms
30ms
opus
10ms
20ms
PTime Configuration
The following table lists the parameter you can use to configure the PTime.
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