| Platform SDK: TAPI | 
The LINEREQUESTMODE_ bit-flag constants describe different types of telephony requests that can be made from one application to another.
No extensibility. All 32 bits are reserved.
  Windows NT/2000: Requires Windows NT 4.0 SP3 or later.
  Windows 95/98: Requires Windows 95 or later.
  Version: Requires TAPI 2.0 or later.
  Header: Declared in Tapi.h.