Yealink SIP-T54S Administrator's Manual page 901

Configuring Audio Features
Permitted
Parameters Default
Values
When Y=9, the default value is 105;
When Y=10, the default value is 107;
When Y=11, the default value is 4;
When Y=12, the default value is 4;
For SIP-T48G/T46G/T42G/T41P/T29G/CP860:
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;
For SIP-T40P/T40G/T23P/T23G/T21(P) E2/T19(P) E2:
When Y=1, the default value is 0;
When Y=2, the default value is 8;
When Y=3, the default value is 18;
When Y=4, the default value is 9;
When Y=5, the default value is 106;
When Y=6, the default value is 103;
When Y=7, the default value is 104;
When Y=8, the default value is 102;
When Y=9, the default value is 105;
When Y=10, the default value is 107;
For SIP-T27P:
When Y=1, the default value is 0;
When Y=2, the default value is 8;
When Y=3, the default value is 18;
When Y=4, the default value is 9;
When Y=5, the default value is 106;
When Y=6, the default value is 103;
When Y=7, the default value is 104;
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