主叫(Calling Line)，电话呼叫系统中的一种，分为主叫和被叫。主叫即是自主呼出方。即传统意义上的“打电话”，被叫即是“接电话”。在现代呼叫系统中，主叫又分为自动主叫和手动主叫，自动主叫即自动设定呼叫系统，手动主叫，即以人为意识主导的呼叫手段.
n. dialing
misc. calling party
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现在，主叫方在高峰时段支付33美分话费；而非高峰时段则是30美分。
Callers now pay 33 cents during peak hours and 30 cents during off-peak hours.
但是当我空手离开这家店的时候，店主叫我再试试别的。
But as I was about to leave without the hat, the shopkeeper convinced me to try another.
例如，直到最近，当你正在通话时还无法显示新来电的主叫号码。
For example, until recently you could not get Caller ID for an incoming call when you were on the phone.
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