Yealink SIP-T2xP Auto Provisioning Manual page 263

Appendix
Parameter Permitted Values Descriptions Web Setting Path
When Y=12, the default value is 0. (only
applicable to SIP-T4X IP phones)
For CP860 IP phones:
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-T21P/T19P IP phones:
When Y=1, the default value is 1;
When Y=2, the default value is 2;
When Y=3, the default value is 0;
When Y=4, the default value is 0;
When Y=5, the default value is 3;
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