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VOIP ATA G.711 ILBC G.729 FXS FXO SIP The Model 5801 is a Voice over IP Telephone Adapter, which allows standard analog telephones to make and receive calls over a cable or ADSL Internet connection. A conventional phone 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.