Zoom Model 5801 Voice over IP Telephone Adapter

Zoom Model 5801 Voice over IP Telephone Adapter ... or cordless phone is plugged into the adapter and then the adapter is plugged into a broadband connected router or Internet gateway. A minimum of five attached phones can be rung simultaneously using the built-in ring generator. The model supports industry-standard Session Initiation Protocol (SIPv2) and works with a wide range of service providers and SIP-based VoIP equipment. The Model 5801 also supports G.711 and iLBC Codecs.