operator

接线员，电话员

May I speak to...?

我能跟...讲话吗？

extension

分机号

May I have extension 209号分机吗?

能帮我接一下分机号209吗？

I'll put you through.

我来帮你连线。

Sorry,the line is busy.

不好意思，现在的电话正在占线，接不通。

The line is busy.

占线

He is out of the office.

他不在办公室。

He is on another call.

他现在正在接别的电话。

Would you leave a meassage?/Can I take a message?

用不用我帮你传个口信呀？

Could you tell him I've called?

能帮忙告诉他我打过电话吗？

Could you tell him to call me back?

能让他给我回个电话吗？