The Linksys PAP2-NA Phone Adapter enables high-quality feature-rich telephone service through your cable or DSL Internet connection. Just plug it into your home Router or Gateway and use the two standard telephone jacks to connect your existing phones or fax machines. Each phone jack operates independently, with separate phone service and phone numbers — like having two phone lines. With an appropriate Internet telephone service provider, you'll get clear telephone reception and reliable fax connections, even while using the Internet at the same time for normal data operations.