Busy: being used 正被占用的;占线的
The line is busy─I'll try again later. 占线 我过会儿再打。
the busy signal 忙音

"make it"这一常见表达有很多意思,现列明如下:
1.to be successful in your career 获得成功
He never really made it as an actor. 他从来就不是一个成功的演员。

2.to succeed in reaching a place in time, especially when this is difficult （尤指在困难情况下）准时到达
The flight leaves in twenty minutes─we'll never make it. 再过二十分钟飞机就起飞了，咱们无论如何也赶不上了。

3.to be able to be present at a place 能够出席（或到场）
I'm sorry I won't be able to make it(for example, to a party)on Saturday. 很抱歉，星期六我不能出席。

4.to survive after a serious illness or accident; to deal successfully with a difficult experience 幸免于难；渡过难关
The doctors think he's going to make it. 医生们认为他能挺过去。
I don't know how I made it through the week. 我不知道自己是怎么熬过那个星期的。

要表达与某人取得联系(尤指通过电话),最简单的表达法就是reach sb.
Do you know where I can reach him? 你知道我在哪儿能跟他联系上吗?