quite common. For example, When an “800” number or “toll-free” number is dialed, the call
can be routed to a regular telephone number, and the charge for that call may be billed to
the called number. In order to process the call, a database is queried to determine or de? ne
the actual destination for the call. Characteristics concerning the handling of the call, such as
routing, can thus involve not only the dialed number, but also various other factors, such as …