You're really call him on it in a nice way.

你真的以一种很好的方式称呼他。

Could you call in on Mum on your way home?

【call】你在回家的路上可以顺便去看看妈妈吗？

I called in on you on my way back to Halifax.

我回哈利法克斯途中去看你。

And I think that it's really just there so that you know that, should things go awry in the office or if you're called in on a meeting, that you have to be responsive.

而且我认为它真的就在那里， 所以你知道，如果办公室出现问题或者你被叫去参加会议，你必须做出回应。