AT&T System 25 - Manual (Page 9)

Account Code Entry (Continued)
Account Code Entry - Incoming Calls
Your call will be disconnected when you follow this procedure.
Therefore, do not attempt it until you have finished your
conversation.
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After you have completed your conversation, and before you
hang up, press the switchhook.
Listen for confirmation tone and dial tone.
Dial * 0 .
❑ ❑
Dial the account code.
NOTE: If you make a mistake while entering the account
code, dial * 0 again and then the account code.
❑ ❑
Listen for confirmation tone, then hang up.
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