Clear-Com LQ-4W2 4-Wire Partyline Over IP ModuleThe LQ 4W2 is a compact box that enable connection of 4 wire audio devices over LAN, WAN or Internet IP infrastructures. The LQ 4W2 can interconnect with devices, such as analog ports of any matrix intercom systems, analog telephone circuits, two way radio gateways and audio consoles. Features: Connectivity Transport audio and call signaling over LAN, WAN and Internet networks Wide range of bitrate settings Linking Up to 6 units can link together