DAG1000-4O FXO analog gateway is a type of entry gateway offering seamless connectivity between IP-based telephony networks also legacy telephones (POTS) and PBX systems. The analog gateway has 4 FXO ports and is used to connect to analog PBX with the PSTN lines of telecom carriers. Standard SIP protocol, it's compatible with Leading IMS/NGN platforms and SIP-based IP Phone systems. It offers low-cost, simple-to-use VoIP solutions for small businesses, SOHO, remote offices, and multi-branch businesses.