Yealink SIP-T2xP Auto Provisioning Manual page 219

Parameter
phone_setting.headsetkey_mode =
phone_setting.emergency.number =
(not applicable to SIP-T48G IP phones)
phone_setting.show_code403 =
Permitted Values
0-Disabled
1-Enabled
The default value is 1.
It configures headset mode precedence
during a call.
0-Always use (pressing the Speakerphone
key and picking up the handset are not
0 or 1
effective when the headset mode is
activated)
1-Use as normal
The default value is 1.
It configures emergency numbers.
String within 99 Multiple emergency numbers are
characters separated by commas.
The default value is 110,911,120.
It configures the display message on the
LCD screen when receiving a 403 message.
String within 99 If it is left blank, the phone will display the
characters value sent from the server when receiving
the 403 message.
The default value is blank.
Descriptions
Features->Phone Lock->Emergency
Appendix
Web Setting Path
209