Automatic message accounting (AMA) provides detail billing for telephone calls. When direct distance dialing (DDD) was introduced in the US, message registers no longer sufficed for dialed telephone calls. The need to record the time and phone number of each long distance call was met by electromechanical data processing equipment.
Read more about Automatic Message Accounting: Centralized AMA, Local AMA, Billing Automatic Message Format (BAF), Message Register
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