Yealink SIP-T54S Administrator's Manual page 893

Configuring Audio Features
Permitted
Parameters Default
Values
X is equal to 1 (for SIP-T19(P) E2/CP860)
Y ranges from 1 to 16 (for CP920)
Y ranges from 1 to 12 (SIP-T54S/T52S/T48S/T46S/T42S/T41S/T27G)
Y ranges from 1 to 11 (for SIP-T48G/T46G/T42G/T41P/T29G/CP860)
Y ranges from 1 to 10 (for SIP-T40P/T40G/T23P/T23G/T21(P) E2/T19(P) E2)
Y ranges from 1 to 9 (for SIP-T27P)
Default:
For SIP-T48G/T46G/T42G/T41P/T29G/CP860:
When Y=1, the default value is 1;
When Y=2, the default value is 1;
When Y=3, the default value is 0;
When Y=4, the default value is 0;
When Y=5, the default value is 1;
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;
For SIP-T54S/T52S/T48S/T46S/T42S/T41S:
When Y=1, the default value is 1;
When Y=2, the default value is 1;
When Y=3, the default value is 0;
When Y=4, the default value is 0;
When Y=5, the default value is 1;
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;
For SIP-T27G:
When Y=1, the default value is 1;
When Y=2, the default value is 1;
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