The DAG1000-4S4O Hybrid Analog Gateway offers seamless connectivity between IP-based telephony networks and legacy telephones (POTS), fax machines, and PBX systems. The analog gateway is the 4 FXS and 4 FXO ports which integrate each FXS and FXO feature. Besides, the gateway with power failover and IP/SIP fail-over features. With the standard SIP protocol, it's compatible with Leading IMS/NGN platforms and also SIP-based IP Phone systems. Small and medium businesses, call centers, SOHO, remote offices, and corporations with several branches can all benefit from its low-cost and simple-to-use VoIP solutions.