lineSecureCall

The lineSecureCall function secures the call from any interruptions or interference that can affect the call's media stream.

LONG WINAPI lineSecureCall(
  HCALL hCall  
);

Parameters

hCall

A handle to the call to be secured. The application must be an owner of the call. The call state of hCall can be any state.

Return Values

Returns a positive request identifier if the function is completed asynchronously, or a negative error number if an error occurs. The dwParam2 parameter of the corresponding LINE_REPLY message is zero if the function succeeds or it is a negative error number if an error occurs. Possible return values are:

LINEERR_INVALCALLHANDLE, LINEERR_OPERATIONUNAVAIL, LINEERR_INVALCALLSTATE, LINEERR_OPERATIONFAILED, LINEERR_NOMEM, LINEERR_RESOURCEUNAVAIL, LINEERR_NOTOWNER, LINEERR_UNINITIALIZED.

Remarks

A call can be secured to avoid interference. For example, in an analog environment, call-waiting tones can destroy a fax or modem session on the original call. The lineSecureCall function allows an existing call to be secured. The lineMakeCall function provides the option to secure the call from the time of call setup. The securing of a call remains in effect for the duration of the call.

Requirements

  Windows NT/2000: Requires Windows NT 4.0 SP3 or later.
  Windows 95/98: Requires Windows 95 or later.
  Version: Requires TAPI 1.3 or later.
  Header: Declared in Tapi.h.
  Library: Use Tapi32.lib.

See Also

Secure a Session Overview, TAPI 2.2 Reference Overview, Supplementary Line Service Functions, LINE_REPLY, lineMakeCall