他们使用的Parlay X Web服务之一是“第三方呼叫”功能。

One of the Parlay X Web services that they could use is the "third party call" feature.

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简单说来，Parlay X 第三方呼叫 Web 服务允许您发起两个电话之间的呼叫连接。

Simply put, a Parlay X Third Party Call Web service allows you to initiate a call connection between two phones.

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第三方呼叫为开发人员提供的最后一个操作是取消呼叫的能力，通过 cancelCall(CallIdentifier) 函数进行。

The last operation that Third Party Call gives a developer is the ability to cancel a call, using a cancelCall(CallIdentifier) function.

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