To enter an account code before making a call or during a call select Actions | Account Code. A valid account code can then be selected from the Account Code drop down.
The Account Codes tab can be used to create icons to speed dial specific numbers and account codes that are regularly used.
When making calls using the IP Office Phone Manager application, the Account Code field shown acts as a drop-down from which the user could select a valid system account code. This operation can disabled by deselecting the Show Account Code option in the IP Office configuration (System | Telephony | Show Account Code). Account code entry is then replaced by PIN code operation.