The economical Zoom Model 5801 and Model 5802 Voice over IP Telephone Adapters allow standard analog telephones to make and receive calls over a broadband Internet connection. Simply plug a conventional or cordless phone into the adapter and then plug the telephone adapter into a broadband-connected router or Internet gateway. Up to five and often more attached phones can be rung simultaneously using the built-in ring generator.
The Model 5801 and Model 5802 support industry-standard Session Initiation Protocol (SIPv2) and work with a wide range of service providers and SIP-based VoIP equipment.
Both models provide one FXS and one FXO port and allow calls to be bridged between the Public Switched Telephone Network (PSTN) and Voice Over IP.