There is literally nowhere in the TCPA or elsewhere where it says that consumers are residential phone numbers(as I understand you treat those the same). If you don't want to read TCPA, you can just google and it has direct answer. However, I personally don't rely on those and I just studied TCPA. It's not that big https://www.dnc.com/faq/are-b2b-calls-exempt-tcpa-regulations