有人 使用了西北航空公司的呼叫代码，机场利用各种途径寻找 人员前往事故 现场和机场指挥中心。

Northwest Airlines Call sign used by someone, airport made every effort to get someone to respond to incident site and the ACC.

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接着呼叫你的计算机代码。

You call up your computer code.

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清单2展示了调用API以发起双方呼叫的代码。

Listing 2 shows the code used to invoke the API to make a two-party call.

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