Action that USES a simple XSLT to call the sample back end service via the Web service Proxy, and creates the response message to be sent back to the requesting client.

操作使用一个简单的XSLT通过Web Service Proxy调用样例后台服务，并创建发送回到请求客户端的响应消息。

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Asynchronous call back - client issues a request and the target will call a service implemented by the client with the response.

异步回调——客户机发出请求，目标将调用使用响应调用客户机实现的服务。

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The specified call-back function handles the response from the Web service.

指定的回调函数将处理来自Web服务的响应。

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They may also be played an automated message advising them of the high demand for service and to either call back later or expect a long delay.

BBC: NHS Direct Wales 'turned off' for 999 calls, Unison claims

For many destinations the call-back service is still cheaper.

ECONOMIST: Germany calling back

They have also developed a solution where at the end of a transaction you get a call back by an automated service to confirm your payment, it reads the transaction through IVR and at the end you type in a PIN to confirm.

FORBES: Emerging Markets Mobile Banking Runs Ahead Of Google Wallet