Analog VoIP gateways are small stand-alone appliances which allow you to convert voice media between FXO and FXS connections and VoIP connections. They are the most cost-effective solution for businesses with a legacy phone system infrastructure which want to connect to a VoIP network, such as a SIP trunk. They are also great for businesses which have an IP-based phone system and need to connect legacy equipment to their IP network, such as analog phones, traditional fax machines and the PSTN for emergency fallback.
All you need to do is place the VoIP gateway at the edge of your network, plug in your existing internet connection to the gateway for VoIP connectivity and the analog cables from your phone system or legacy equipment and the gateway will automatically handle everything to allow voice media to simply work, including fax.