The Cisco SPA112 is compact in design and compatible with international voice and data standards. It can be used with residential, home-office, and small-business-VoIP service offerings, including full-featured hosted or open source IP PBX environments. Now you can use your phone over the Internet, without compromising on voice quality or phone and fax features. The Cisco SPA112 2-Port Adapter offers the benefits of high-quality voice over IP (VoIP) without the need to upgrade your existing analog phones. Easy to install and use, the SPA112 works over an IP network to connect analog phones and fax machines to a VoIP service provider.