... -density access devices used in residential, SOHO and mobile office VoIP applications. It provides reliable, low-cost, and flexible means to ... the application software which inherits from the RDT famous MX gateway design, delivering stable performance, high interoperability and compatibility, and rich ... -HX402 20 1 1 IDM-HX422 22 1 1 Support VoIP Gateway with 1 FXS, 1 FXO and 2 Ethernet ports