What species of equipment could I use to know what company a entity trying to give the name? read details plz! ?

ok, I have a client that I take effort of his calls. They call his bureau the call gets forwarded to me... everything be fine until I was requested to take call from a second client the thing is.... now I don't know for what company they're calling! Is within anything (like a software) that could tell me what company the person is trying to make?
Answers:
You could ask?
Or have separate phone lines for each of the company's.
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