AT&T MERLIN LEGEND Analog Direct-Line Console Operator's Manual page 60

Using Features
To Enter or Change Account Codes During a Call
1. Press programmed Account Code button, or press programmed
Feature button and dial 82. See Notes.
2. Dial account code followed by #.
Notes:
If you make an error, you can correct the code by using
the instructions above.
Press # if you don't have a programmed Feature button.
Account Code Entry 4 - 7