Administrator’s Guide for SIP-T5 Series Smart Media Phones
638
7.
Click
Confirm
to accept the change.
Packetization Time (PTime)
Ptime 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.
The following table summarizes the valid values of ptime for each audio codec:
Codec
Packetization Time
(Minimun)
Packetization Time (Maximun)
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
Procedure
PTime can be configured using the following methods.
Central Provisioning
(Configuration File)
<MAC>.cfg
Configure the ptime.
Parameter:
account.X.ptime
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