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Tasks Needed to be Performed
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接收呼叫者之呼叫 (Collecting Digits)
| 分析所撥號碼 (Digit Analysis)
| 決定路徑 (Routing)
| 建立連線 (Call set up)
| 呼叫受話者 (Terminating)
| 連接雙方 (Make Connection)
| 計時計費 (Billing)
| 處理掛斷 (Hang-up)
| 特殊功能之處理 (Special Feature, Call Waiting, Call Forwarding, etc.)
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Call Processing module response to user's request (signal) and decides
next task to take
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The process is modeled as a Finite State Machine
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