internal static extern int cstaPickupCall(IntPtr acsHandle, uint invokeID, ref ConnectionID_t deflectCall, ref DeviceID_t calledDevice, IntPtr privateData);
internal static extern int cstaConsultationCall(IntPtr acsHandle, uint invokeID, ref ConnectionID_t activeCall, ref DeviceID_t calledDevice, ref PrivateData_t privateData);
internal static extern int cstaHoldCall(IntPtr acsHandle, uint invokeID, ref ConnectionID_t activeCall, bool reservation, IntPtr privateData);
internal static extern int cstaClearConnection(IntPtr acsHandle, uint invokeID, ref ConnectionID_t call, ref PrivateData_t privateData);
internal static extern int cstaConferenceCall(IntPtr acsHandle, uint invokeID, ref ConnectionID_t heldCall, ref ConnectionID_t activeCall, IntPtr privateData);
internal static extern int cstaAnswerCall(IntPtr acsHandle, uint invokeID, ref ConnectionID_t alertingCall, IntPtr privateData);
internal static extern int cstaCallCompletion(IntPtr acsHandle, uint invokeID, Feature_t feature, ref ConnectionID_t call, ref PrivateData_t privateData);
internal static extern int cstaAlternateCall(IntPtr acsHandle, uint invokeID, ref ConnectionID_t activeCall, ref ConnectionID_t otherCall, IntPtr privateData);
internal static extern int cstaSnapshotCallReq(IntPtr acsHandle, uint invokeID, ref ConnectionID_t snapshotObj, IntPtr privateData);
internal static extern int cstaMonitorCall(IntPtr acsHandle, uint invokeID, ref ConnectionID_t call, ref CSTAMonitorFilter_t monitorFilter, ref PrivateData_t privateData);
internal static extern int cstaTransferCall(IntPtr acsHandle, uint invokeID, ref ConnectionID_t heldCall, ref ConnectionID_t activeCall, ref PrivateData_t privateData);
internal static extern int cstaRetrieveCall(IntPtr acsHandle, uint invokeID, ref ConnectionID_t heldCall, IntPtr privateData);