Yealink SIP-T21 E2 Administrator's Guide

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
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Parameters
Permitted
Values
Default
When Y=8, the default value is 102;
When Y=9, the default value is 105;
Example:
account.1.codec.1.rtpmap = 0
Note: It is only applicable to the IP phones running firmware version 81 or prior.
Web User Interface:
None
Phone User Interface:
None
The configuration of audio codecs via web user interface for old configuration behavior is the
same as the newer one. For more information, refer to the introduction in the section New
Configuration Behavior.
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.

Yealink SIP-T21 E2 Specifications

General

Brand	Yealink
Model	SIP-T21 E2
Category	IP Phone
Language	English