... VB, DELPHI, PB, C++ Builder,. NET, WEB GX16 telephone voice boardFeatures and Benefits:With USB interface, whole based on ... all activeEach module is designed for two-channel level inserting, modules firm plug into backplane so it is not ... one-channel telephone voice board GX02---- two-channel telephone voice board GX04---- four-channel telephone voice board GX08---- eight-channel telephone voice board ...