calling line identification

例句：

1. 1. The engineer needs to identify the source of the faulty equipment.
   工程师需要识别出故障设备的源头。
2. 2. During the call, the customer service representative identified the issue and offered a solution.
   在电话中，客服代表识别出了问题并提供了解决方案。
3. 3.The technician used specialized software to identify the root cause of the problem.
   技术人员使用专门的软件来识别问题的根本原因。