You would need to discontinue the voice telephone service associated with that phone number, leaving only DSL service on the wires coming into your house. You'd then use a DSL splitter on EVERY phone jack, including the one on the OBiTALK device, unless the splitting is done for you at the demarc box (the box on the wall where your phone/DSL service enters your premises. Your phone company may or may not offer DSL-only service, also known as "naked DSL". You'll have to ask them.