Abstract

Automatic number identification provides facilities for automatically obtaining calling customers' directory numbers in No. 1 crossbar, panel and step-by-step central offices and transmitting these numbers to a tandem or toll office for recording on centralised automatic message accounting equipment for billing purposes. Present centralized automatic message accounting systems require operators to request the calling customers' numbers and to key these numbers into recording equipment. The new facilities feature a simplified procedure for customers, improvement in speed of service and greater accuracy of billing records. Offices with local automatic message accounting facilities already have these features and are not candidates for automatic number identification.

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