Grace Miller and Theresa Vincent staff the PBX, or private-branchexchange, switchboard at the Southern California Air Pollution District office in 1959.
Message Fa?ade receives asynchronous messages from the PBX/ACD (privatebranchexchange/automated call distributor).
Message Fa?ade 从 PBX/ACD（专用交换机/自动呼叫分配器）接收异步消息。
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The SPA8000 is interoperable with common telephony equipment such as voicemail, fax, privatebranchexchange (PBX), and interactive voice response systems.