Answer to question #3: OtxDrvConnectLib() OtxDrvCreateEvent() OtxDrvCreateEventQueue() OtxDrvEnable() OtxDrvOpenPhysicalDevice() OtxDrvEnable() OtxT1SetConfiguration() OtxT1E1SetLiMode() OtxDrvCreateLogicalDevice() OtxDrvCreatePipe() OtxDrvConnectPipe() OtxDrvConnectLogicalDevice() OtxToneDtmfDiallerInit() - (just an example, the appropriate logical device has to be initialized)