DAG3000 is a multi-functional analog VoIP gateway offering seamless connectivity around IP-based telephony networks and legacy telephones (POTS), fax machines, also PBX systems. It adopts a modularized hardware design that enables expanding FXS ports by adding boards according to the user's requirements. Each has 8 FXS ports the gateway supports 112 FXS ports at maximum. DAG3000 is connected with leading IMS/NGN platforms and SIP-based IP Phone systems, and it provides the basic SIP protocol. Small and medium enterprises, call centers, and multi-location environments that require VoIP services may benefit from it.