The advent of the electronic computer switching system has broadened the telephone's capabilities beyond single-party calls, bringing such functions as three-party calls, wake-up calls, and direct dialing into play.
換言之，可以利用程式的變換、設定，玩出各種花樣。按鈕電話的玄機人腦分語言區、記憶區等部分，電子交換機的電腦，也劃分區域以發揮不同功能。例如，三方通話、按時叫醒、直通電話… … 各有地盤。