Forced Account Codes can be used to control access to exchange lines and thus help track phone usage. If the system is equipped with an SMDR output collection device, the FAC is included in the call record data.

Extensions can be forced to enter a FAC before making an outside call or, alternatively, FAC details can be voluntarily entered at any time during an incoming or outgoing exchange call by using function F71 (or pressing a FAC feature key) and then entering a valid FAC.

FACs can be stores as system abbreviated numbers for easy error-free use.

The User Code can be programmed to "follow" a designated extension number's Class Of Service. This enables a user to place outgoing calls from any extension in the system and by using their own FAC, the toll restrictions assigned to their own COS will be followed. This allows them to call outside numbers from an extension that is normally barred access to those particular numbers.