Yealink SIP-T54S Administrator's Manual page 894

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
When Y=3, the default value is 1;
When Y=4, the default value is 1;
When Y=5, the default value is 0;
When Y=6, the default value is 0;
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;
For SIP-T40P/T40G/T23P/T23G/T21(P) E2/T19(P) E2:
When Y=1, the default value is 1;
When Y=2, the default value is 1;
When Y=3, the default value is 1;
When Y=4, the default value is 1;
When Y=5, the default value is 0;
When Y=6, the default value is 0;
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;
For SIP-T27P:
When Y=1, the default value is 1;
When Y=2, the default value is 1;
When Y=3, the default value is 1;
When Y=4, the default value is 1;
When Y=5, the default value is 0;
When Y=6, the default value is 0;
When Y=7, the default value is 0;
When Y=8, the default value is 0;
When Y=9, the default value is 0;
Example:
account.1.codec.1.enable = 1
It means that the audio codec PCMU is enabled on the account 1.
Note: It is only applicable to the IP phones running firmware version 81 or prior.
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Parameters
Permitted
Default
Values