Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series IP Phones
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Packetization Time
(Minimun)
Packetization Time (Maximun)
PTime Configuration
The following table lists the parameter you can use to configure the PTime.
It configures the ptime (in milliseconds) for the codec.
0-Disabled
10-10
20-20
30-30
40-40
50-50
60-60
Account->Advanced->PTime(ms)
[1]
X is the account ID. For T54S/T48S/T48G/T46S/T46G/T29G, X=1-16; for T52S/T42G/T42S, X=1-12; for
T41P/T41S/T27P/T27G, X=1-6; for T40P/T40G/T23P/T23G, X=1-3; for T21(P) E2, X=1-2; for T19(P) E2, X=1.
Early Media
Early media refers to the media (for example, audio and video) played to the caller before a SIP call is
actually established.
Current implementation supports early media through the 183 message. When the caller receives a 183
message with SDP before the call is established, a media channel is established. This channel is used to
provide the early media stream for the caller.
You can also configure 180 ring workaround which defines whether to deal with the 180 message
received after the 183 message. When the caller receives a 183 message, it suppresses any local ringback
tone and begins to play the media received. 180 ring workaround allows IP phones to resume and play
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