OpenVox PRI T1/E1/J1 digital cards are most advanced, high-performance, cost effective, digital telephony interfaces. With the combination of OpenVox hardware and open source software, numerous telephony configurations are possible. From the traditional PBX to VoIP Gateways, OpenVox solutions are leading the way for unified communications. All OpenVox E1/T1/J1 interface cards can be connected directly to the E1/T1/J1 physical interface and enable our customers to build the leading PBX, IVR and call center applications worldwide.