Models 5820/5821 Voice over IP Telephone Adapters allow standard analog telephones to make and receive calls over a broadband Internet connection. Both models have two FXS ports to allow two VoIP channels. Simply plug one or two conventional or cordless phones into a Model 5820 or 5821 and then plug the telephone adapter into a broadband- connected router or Internet gateway. A minimum of five attached phones can be rung simultaneously on each FXS port using the built-in ring generator.
The Models 5820/5821 support industry-standard Sessions Initiation Protocol (SIPv2) and work with a wide range of service providers and SIP-based VoIP equipment.
Voice over IP Service providers can deliver a rich variety of advanced telephone services through the Models 5820/5821, including CLASS features such as, Call Waiting, Caller Identification, Call Transfer, Call Hold, Call Forwarding, Distinctive Ringing, and Voice Message Waiting Indication.
The VoIP terminal adapter can be configured remotely using a TFTP or HTTP download from the service provider and updates to the firmware can be automatically delivered. Local configuration is done with a browser-based graphical user interface.
The Model 5820 supports G.711, G.729 and iLBC voice codecs. The Model 5821 supports G.711 and iLBC.
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