The telephone system can store a number of account codes. Account codes may be used to keep track of calls in relation to particular activities or clients. They can also be used to keep track of calls by particular users or sets of users.

When an account code is entered while making a call or during a call, that account code is included in the call records output by the system.
Accounts entered are checked against those stored by the telephone system. If an invalid code is entered, the account code is requested again.
The system administrator can configure certain numbers or types of numbers to require entry of an account code before you can continue making a call to such a number.
The system administrator can also configure a requirement for you to enter an account code before making any external call.