Completing telecommunications calls in a competitive environment

摘要: In an environment of competitive local and interexchange carriers, offering number portability between carriers serving a common region switches that region, each carrier accesses regional database to determine the identity switch customer. addition, access national customer specified by dialed originating For customers requiring high reliability service, alternate can be used serve such in case primary is unavailable; databases identify these carriers. Advantageously, this arrangement allows degree freedom movement geographic relocation without change.