Yealink SIP-T54S Administrator's Manual page 418

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
Enter the desired time in the Auto Answer Delay(1~4s) field.
2.
Click Confirm to accept the change.
3.
To configure auto answer tone via web user interface:
Click on Features->General Information.
1.
Select the desired value from the pull-down list of Enable Auto Answer Tone.
2.
Click Confirm to accept the change.
3.
To configure auto answer via phone user interface:
1. Press Menu->Features->Auto Answer.
2. Select the desired line.
3. Press
Answer field.
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or , or the Switch soft key to select the desired value from the Auto