Automatic message accounting

AMA paper tape puncher, from a 20th-century 5XB switch

Automatic message accounting (AMA) provides detailed accounting 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.

单词	Automatic Message Accounting
释义	Automatic Message Accounting 英语百科 Automatic message accounting Automatic message accounting (AMA) provides detailed accounting 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.
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Automatic Message Accounting

Automatic message accounting