空气污染一直没有消失，但是这些专用分组交换机却已经被全被直拨电话和计算机化的路由呼叫系统替代了。
Air pollution hasn't gone away, but these PBX RIGS have been replaced just about everywhere by direct-dial phone lines and computerized call-routing systems.
专用综合服务网络交换（PINX）是在BRI语音应用中使用QSIG信令的专用分组交换机或主系统。
Private INtegrated services network eXchange(PINX) is a PBX or key system which, in a BRI voice application, uses QSIG signaling.
1959年，南加利福尼亚空气污染地区办公室专用分组交换机的接线员格雷斯·米勒（Grace Miller）和特瑞莎·文森特（Theresa Vincent）位于接线总机旁边。
Grace Miller and Theresa Vincent staff the PBX, or private-branch exchange, switchboard at the Southern California Air Pollution District office in 1959.
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