The DPH-140S Business IP Phone is compatible with most VoIP service providers. It operates like a regular telephone, but is especially made for use with a VoIP phone service. With a VoIPphone service and this IP phone, avoid expensive long-distance and international phone toll charges. The DPH-140S has a built-in Ethernet interface to simply connect to a DSL modem, cable modem, or to your broadband router. Once connected and logged on to the Internet, you are ready to make and receive calls.