GTNG2000-24S DAG2000-24S FXS analog gateway are versatile IP-based voice and fax gateway. For small to medium business, the family office, remote office and branch business provide a low cost, simple operation VoIP solutions. The users easy to connected their analog phone, fax, PBX with standard voice interface and provide high quality voice service. FXS VoIP access gateway use standard SIP protocol and compatible with Leading IMS/NGN platform, IPPBX and SIP servers.