Depending where you live, you can set up a list of 12–15 numbers you want forwarded. When someone calls from a number on your list, you hear a short ring, and the call is forwarded.
You can't answer incoming calls from forwarded numbers. (They're transferred before you can pick up the phone.) If you decide you no longer want a certain number forwarded, you need to delete the number from your forward list or turn Selective Call Forwarding OFF.
Incoming calls that aren't on your list ring through to your business like normal. You can continue to make outgoing calls as you always do.
The number receiving your forwarded calls rings normally.
If you forward calls to a long distance (or toll) number, you're charged applicable rates.