Yealink SIP-T48G Administrator's Manual page 209

Configuring Audio Features
Parameters Permitted Values Default
When Y=2, the default value is 3;
When Y=3, the default value is 0;
When Y=4, the default value is 0;
When Y=5, the default value is 4;
When Y=6, the default value is 1;
When Y=7, the default value is 0;
When Y=8, the default value is 0;
When Y=9, the default value is 0;
When Y=10, the default value is 0;
When Y=11, the default value is 0;
When Y=12, the default value is 0; (only applicable to SIP-T48G IP phones)
Example:
account.1.codec.1.priority = 2
Web User Interface:
Account->Codec
Phone User Interface:
None
account.1.codec.Y.rtpmap Integer
Refer to the following
content
(Y ranges from 1 to 12) from 0 to 127
Description:
Configures the rtpmap of the audio codec for the account.
When Y=1, the default value is 0;
When Y=2, the default value is 8;
When Y=3, the default value is 4;
When Y=4, the default value is 4;
When Y=5, the default value is 18;
When Y=6, the default value is 9;
When Y=7, the default value is 106;
When Y=8, the default value is 103;
When Y=9, the default value is 104;
When Y=10, the default value is 102;
When Y=11, the default value is 105;
When Y=12, the default value is 97; (only applicable to SIP-T48G IP phones)
Example:
197