Yealink SIP T2 Series Provisioning Manual page 99

Parameter
features.auto_answer_delay
features.allow_mute
Permitted
Values
caller's phone LCD screen.
404-Not Found
480-Temporarily Not Available
486-Busy Here
603-Decline
If it is set to 486 (Busy Here), the caller's phone LCD
screen will display the message "Busy Here" when
the callee rejects the incoming call.
The default value is 603.
It configures the delay time (in seconds) before the
IP phone automatically answers an incoming call.
Integer from 1
The default value is 1.
to 4
Note: It works only if the value of the parameter
"account.1.auto_answer" is set to 1 (Enabled).
It enables or disables the IP phone to mute an
active call.
0-Disabled
0 or 1
1-Enabled
The default value is 1.
Descriptions
Features->General
Information->Auto-Answer
Delay(1~4s)
Features->General
Information->Allow Mute
Appendix
Web Setting Path
93