... ++, VB, DELPHI, PB, C++ Builder,. NET, WEB GXUSB-8-line telephone voice boxFeatures and Benefits: With USB interface, easy to ... detects pickup and hangup of agent phoneExternal-line modules: Detects ringing signal of external line and control pickup and hangup of external ... GX08U-4U4T 8-channel agent box(4- internal line and 4-external line)Development Environment: Provides drivers in WIN2000/XP and ...