| 摘要 |
A method and an apparatus for making least-cost non-local telephone calls. In accordance with this method, an identification code of a customer and a plurality of carrier codes associated with the identification code are stored in a memory which is accessible by a computer at a universal exchange. Each carrier code identifies a respective one of a plurality of telephone call carriers. Subsequent to the storing step, the universal exchange receives the customer identification code and a destination telephone number by means of a telephone call from the customer. The computer at the universal exchange processes the destination telephone number and the plurality of carrier codes corresponding to the customer identification code in accordance with respective rate schedules for those carriers and a least-cost routing algorithm, thereby determining a least-cost carrier for connecting the customer to the station identified by the destination telephone number. The computer then controls a telephone switching matrix to route the telephone call to an exchange of the least-cost carrier.
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