The simple and short answer is no! While some NBN services are delivered using a copper cable, there is no need to keep an active telephone line to connect to NBN. In the case of FTTN/B (fibre to the node or basement) NBN will use the existing copper cable that runs into your business. If your business has not had a copper telephone line installed in the past, then NBN will connect a new copper cable for you.
If your business is connected to NBN by FTTP, HFC or Fixed Wireless, then no copper cable will be needed to connect your business to NBN.
If you have any more questions about your business requirements, you can reach out to us anytime by using the chatbot attached to this page, by calling us at 1300 193 299 or by contacting us via our contact form here.