Is there a way to know which from the mutliple lines someone is calling on?

[Pinjo1]

I have several different lines (some forwarded from Google Voice, some from Polycom, some from Verizon) and they are a mixture of personal and business. I answer the calls differently based on what the nature of the call is. Problem is, I haven't found a simple reliable way to know before I pick up which line it is actually, any ideas?