Here is a way to use your Google Voice number for business calls.
Let's say I have one phone, and receive personal calls AND business calls on the same phone. But how do I know who is calling my personal line, and how do I know who is calling the business line?
This is where a Google Voice number kicks in:
Set any calls made to your GV number, (which you use as your business line), to ring your personal phone, and then in the GV settings you have all calls made to your GV number show up on your phone
AS your GV number on your phone. You won't see the caller's ID, you'll see
YOUR Google Voice number. Therefore, YOU KNOW that call is a business call! I do this. I don't care to know the caller ID of calls made to my business anyway. So, when a call comes in and I see on the caller ID my GV number, I know to answer it, "This is ________.. How can I help you?"
When someone calls my personal line/number, I see there phone number. I know that is a personal call.. It works great..
Even better still, if you have a "friends and family" number, which are free calls, you can set the GV number as one of these F & F numbers, and all INCOMING business calls are FREE (they do not count against your minutes). Using my business phone for hundreds, and hundreds of minutes, this saves me a little per month.. (i.e. no need to step up to the next level calling plan).
Hope all that makes sense.. Forgive me if this was explained in another post.

If anyone needs any help in setting that up, send a message..
Chief