The New Linksys Phone Adapter, combined with a subscription to a specific VoIP service plan, turns your existing Internet connection into a high-quality phone line for placing and receiving phone calls. The phone adapter comes equipped with two standard phone ports (RJ-11) and one Ethernet port (RJ-45). Users connect their existing cordless or stationary phones or a fax machine to the phone adapter; connect the phone adapter to a router or gateway via the Ethernet port. Each phone jack operates independently, with separate phone service and phone numbers. It's just like having two phone lines.