Audio Features
172
Codec Packetization Time (Minimum) Packetization Time (Maximum)
G726-40 10ms 30ms
G723_53/
G723_63
30ms 60ms
iLBC 20ms 30ms
opus 10ms 20ms
iLBC_15_2kpbs 20ms, 40ms, 60ms
iLBC_13_33kpbs 30ms, 60ms
PTime Configuration
The following table lists the parameter you can use to configure the PTime.
Parameter
account.X.ptime
[1]
<MAC>.cfg
Description
It configures the ptime (in milliseconds) for the codec.
Permitted
Values
0-Disabled
10-10
20-20
30-30
40-40
50-50
60-60
Default
20
Web UI
Account > Advanced > PTime (ms)
[1]
X is the account ID. For T57W/T54W/T48U/T48S/T48G/T46U/T46S/T46G/T29G, X=1-16; for
T53W/T53/T43U/T42G/T42U/T42S, X=1-12; for T41P/T41S/T27G, X=1-6; for T33P/T33G, X=1-4; for
T40P/T40G/T23P/T23G, X=1-3; for T31P/T31G/T31/T21(P) E2, X=1-2; for T30P/T30/T19(P) E2/CP920, X=1.
Early Media
The 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 the phones to resume and play the local ringback tone upon
a subsequent 180 message received.
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