Abstract: A system and method are disclosed for alerting a person placing a telephone call when a dialed number subscribes to a Caller Identification Service. A long distance party is called direct using standard 1+ calling. The call is routed through a long distance carrier switching network which is coupled to a signaling network. The signaling network routes the caller's identification information together with the dialed number to the switches in the switching network. The switching network includes a subscription table for determining whether the dialed number subscribes to the aforesaid service. If the dialed number is a subscriber, the caller's identification information and the dialed number are routed from the switching network to a Customer Long Distance Adjunct. The adjunct transmits a message to the caller via the switching network informing the caller that the dialed number is a subscriber.

Abstract: The standard exchange message interface (EMI) message record generated for interexchange telephone toll calls is enhanced via the addition of a primary interexchange carrier (PIC) indicator, whose value provides an indication as to whether a terminating subscriber has a particular interexchange carrier as his/her PIC. The PIC indicator may be used by the interexchange carrier when bills are rendered for its subscribers--for example, to provide different billing treatment for calls that were made over that carrier's network to terminating subscribers whose PIC is, in fact, that very carrier, as opposed to calls that were made to subscribers with a different PIC.