This term is synonymous with the term main station or Direct Exchange Line (DEL) which are commonly used in telecommunication documents.

这个术语与通信文献中常见的主站或直拨交换线(DEL)是同义的。

youdao

Domain trading mode: Please contacts with myself, on-line direct exchange, 5 minutes complete, simple quickly.

域名交易方式：请联系本人，网上直接交易，五分钟搞定，简单便捷。

youdao

Three days after Direct Line shares started trading on the London Stock Exchange, that helps make the case for the Hester recovery programme being on track.

BBC: Royal Bank's obstacle course