Audio Codecs On - Yealink SIP-T2 SERIES Administrator's Manual

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Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones

The following table summarizes the supported audio codecs on IP phones:

Packetization Time

Ptime (Packetization Time) 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.

Codecs and priorities of these codecs are configurable on a per-line basis. The attribute "rtpmap"

is used to define a mapping from RTP payload codes to a codec, clock rate and other encoding

Packetization

Troubleshooting