The NGX is designed for tapping behind a proprietary TDM PBX. Residing between the PBX and agent phones, the SmartWORKS NGX's high impedance receivers record both sides of a call without interrupting service. The NGX is available in 8,16, and 24 port configurations. The SmartWORKS API supports a total of 512 channels per system. As a result, the SmartWORKS NGX is ideal for low to high-density environments.