Yealink SIP-T54S Administrator's Manual page 417

Select the desired value from the pull-down list of Auto Answer.
3.
Click Confirm to accept the change.
4.
To configure auto answer and auto answer mute via web user interface:
Click on Account->Basic.
1.
Select the desired account from the pull-down list of Account.
2.
Select the desired value from the pull-down list of Auto Answer.
3.
Select the desired value from the pull-down list of Auto Answer Mute.
4.
Click Confirm to accept the change.
5.
To configure a period of delay time for auto answer via web user interface:
Click on Features->General Information.
1.
Configuring Basic Features
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