An account code is typically used to identify a department, project, or client for charge-back or tracking purposes. An account code can be either forced or optional. When an extension is set up with the forced account code feature, the user must enter an account code before they can dial outside calls
To Manually Enter an Account Code
1.After lifting the handset (or while already active on an outside call), press Feature and dial 900.
2.Enter an account code by dialing the account code using the telephone's dial pad.
3.Press # or press the Done soft key.
4.Continue with the call.
To Create an Account Code Entry Button
1.At the phone press Feature *3. Program Ext: is displayed.
2.Press the button that you want to edit or enter the button number to select the button. The current setting of the button is displayed.
3.Dial Feature 900. The current setting of the button will now be set to Account Code Entry.
•To finish, end the call or press the 
Release button.
To Use an Account Code Button
1.After lifting the handset or while already active on an outside call, press the Account Code Entry button.
2.Enter an account code using the telephone's dial pad. Press the Account Code Entry button again or press # or press the Done soft key.
3.Continue with the call.