Call forwarding service

[Spencer I.]

Is there a call forwarding service similar to google voice, but will allow you to have more than one number forward to the same phone? I am partnering with another wholesaler in my area, and we need a new phone number so we can track where our leads are coming from. I still have mail pieces going out with my initial google voice number. We want to create a new number to put on our marketing and have it forward to my phone as well. All suggestions welcome.