Yealink SIP T2 Series Provisioning Manual page 101

Parameter
features.ringer_device.is_use_headset
features.factory_pwd_enable
auto_provision.reset_factory.enable
Permitted
Descriptions
Values
It takes effect after a reboot.
It configures the ringer device for the IP phone.
0-Use Speaker
1-Use Headset
2-Use Headset & Speaker
0, 1 or 2
If the ringer device is set to Headset or
Headset&Speaker, the headset should be
connected to the IP phone and the headset mode
also should be activated in advance.
The default value is 0.
It enables or disables the IP phone to prompt for
the administrator password when you long press
the OK key to perform a factory reset.
0 or 1
0-Disabled
1-Enabled
The default value is 0.
It enables or disables the IP phone to be reset to
factory when you upgrade the phone firmware
0 or 1
from a non-Lync version to a Lync version.
0-Disabled
Appendix
Web Setting Path
Features->Audio->Ringer Device for
Headset
95