Importance

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Abstract

Disclosed are schemes for selecting an interexchange telephone call carrier, selecting a route to the selected carrier, and establishing a call path on the selected route to the selected carrier in a multicarrier environment. To select a call route from a local telephone company switching office to a carrier switching office, first a route identifier is generated which comprises a set of keys to a data base for identifying therein a default route to the selected carrier. Then alternative sets of keys are obtained from data base by translating the class of service characteristics of the call and the called number. The set of keys identifying the default route is modified with those keys of the alternative key sets that are defined, to obtain alternative route identifiers, and the keys of the various route identifiers are modified by the carrier identification code. Route identifiers are then sequentially selected from the alternative and default route identifiers to obtain one route identifier that identifies in the data base a descriptor of a route that is defined. The defined route is then established, if possible.

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First Claim