It's widely used in call center and telephone banking system. Because customers in these systems will probably request a extra service.

在呼叫中心和电话银行系统中的应用很广泛，因为在这些系统中顾客都有可能会需要额外的服务。

youdao

Using mobile telephone simulator, we realize a prototype of mobile banking system based on J2ME platform.

基于J2ME平台，利用手机模拟器，实现了使用该协议的手机银行原型系统。

youdao

The bug infests most elements of everyday life: electricity, gas and water supplies, telephone services, the banking system, health services, transport and industry are all at risk if it is not caught in time.

ECONOMIST: The bill for the millennium bug keeps going up

The slower Bacs payment system - which underlies telephone and internet banking services - has also failed to show any trend of savers shifting their money.

BBC: 'No floods' of switching savers