Zoom 5821F VoIP Gateway – 2 x FXS , 1 x Network LAN.
The Model 5821F Voice over IP Telephone Adapter allows standard analog telephones to make and receive calls over a broadband Internet connection. The 5821F has two FXS ports to allow two VoIP channels. Simply plug one or two conventional or cordless phones into a Model 5821F and then plug the telephone adapter into a broadbandconnected router or Internet gateway. Up to five and often more attached phones can be rung simultaneously on each FXS port using the built-in ring generator.
The Models 5821F supports industry-standard Sessions Initiation Protocol (SIPv2) and work with a wide range of service providers and SIP-based VoIP equipment.