Yealink SIP-T2 SERIES Administrator's Manual page 825

Configuring Audio Features
Permitted
Parameters Default
Values
Y ranges from 1 to 15 (for SIP VP-T49G)
Y ranges from 1 to 11 (for SIP-T48G/T46G/T42G/T41P/T29G/CP860)
Y ranges from 1 to 9 (for SIP-T40P/T27P/T23P/T23G/T21(P) E2/T19(P) E2)
For SIP VP-T49G:
When Y=1, the default value is 5;
When Y=2, the default value is 6;
When Y=3, the default value is 13;
When Y=4, the default value is 7;
When Y=5, the default value is 4;
When Y=6, the default value is 12;
When Y=7, the default value is 11;
When Y=8, the default value is 10;
When Y=9, the default value is 9;
When Y=10, the default value is 8;
When Y=11, the default value is 14;
When Y=12, the default value is 0;
When Y=13, the default value is 1;
When Y=14, the default value is 2;
When Y=15, the default value is 3;
For SIP-T48G/T46G/T42G/T41P/T29G/CP860:
When Y=1, the default value is 2;
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;
For SIP-T40P/T27P/T23P/T23G/T21(P) E2/T19(P) E2:
When Y=1, the default value is 2;
When Y=2, the default value is 3;
When Y=3, the default value is 4;
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