Yealink SIP-T2xP Auto Provisioning Manual page 260

Yealink IP Phones Auto provisioning Guide
Parameter
account.X.codec.Y.enable =
(SIP-T28P/T48G/T46G: X ranges from 1 to 6.
SIP-T26P/T22P/ T42G/T41P: X ranges from 1 to 3.
SIP-T21P/T20P: X ranges from 1 to 2.
SIP-T19P/CP860: X=1.
SIP-T28P/T26P/T22P/T20P/CP860: Y ranges from 1 to
11.
SIP-T21P/T19P: Y ranges from 1 to 8.
250
Permitted Values
When Y=11, the default value is G726-40.
When Y=12, the default value is GSM (only
applicable to SIP-T4X IP phones).
For SIP-T21P/T19P IP phones:
When Y=1, the default value is PCMU;
When Y=2, the default value is PCMA;
When Y=3, the default value is G723_53;
When Y=4, the default value is G723_63;
When Y=5, the default value is G729;
When Y=6, the default value is G722;
When Y=7, the default value is iLBC;
When Y=8, the default value is G726-32.
It enables or disables the specified codec
for account X.
0-Disabled
1-Enabled
0 or 1
Example:
account.1.codec.1.enable =1
This means that the codec PCMU is enabled
on the phone.
Descriptions
Account->Codec
Web Setting Path