A system for a caller to control a distinctive ring for a telephone call
includes a service switching point and a service control point. The
service switching point is operable to receive a feature code and a
called directory number, and to issue a query in response to receiving
the feature code. The service control point is operable to receive the
query and issue a response to the service switching point. The response
includes a distinctive ring parameter. Upon receiving the response from
the service control point, the service switching point processes the call
so that the distinctive ring parameter causes a distinctive ring signal
to be applied to a called telephone line associated with the called
directory number.