Packetization Time (Ptime); Supported Ptime Of Audio Codec - Yealink SIP-T3 Administrator's Manual

Administrator's Guide for SIP-T2 /T3 /T4 /T5 /CP920 IP Phones
Default opus, amr
Supported
T57W, T54W, T53W, T53, T53C, T48U, T46U, T43U, T42U, T33P, T33G, T31P, T31G, T31, T30P, T30
Devices
[1]
X is the account ID. For T57W/T54W/T48U/T48S/T48G/T46U/T46S/T46G/T29G, X=1-16; for
T53W/T53/T53C/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/CP925/CP935W, X=1.

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
G722
PCMA
PCMU
G729
G726-16
G726-24
G726-32
G726-40
G723(53 kbps)/ G723(63
kbps)
iLBC
opus
iLBC(15.2kbps)
iLBC(13.33kbps)
197
Packetization Time (Min-
imum)
10ms
10ms
10ms
10ms
10ms
10ms
10ms
10ms
30ms
20ms
10ms
Packetization Time (Maximum)
40ms
40ms
40ms
80ms
30ms
30ms
30ms
(40ms for T40P/T40G/T23P/T23G/T21(P) E2/T19(P)
E2)
30ms
60ms
30ms
20ms
20ms, 40ms, 60ms
30ms, 60ms