TSPI_lineSetDefaultMediaDetection

  • Article

This procedure tells the service provider the new set of media types to detect for the indicated line (replacing any previous set). It also sets the initial set of media types that should be monitored for on subsequent calls (inbound or outbound) on this line.

LONG TSPIAPI TSPI_lineSetDefaultMediaDetection(
  HDRVLINE hdLine, 
  DWORD dwMediaModes 
);

Parameters

  • hdLine
    Handle to the line to have media monitoring set.
  • dwMediaModes
    Media types of interest to TAPI. This parameter uses one of the LINEMEDIAMODE constants.

Return Values

Returns zero if the function succeeds, or an error number if an error occurs. The following table shows the return values for this method.

Value Description
LINEERR_INVALLINEHANDLE The handle to the line is invalid.
LINEERR_OPERATIONFAILED The operation failed.
LINEERR_INVALMEDIAMODE The media mode is invalid.
LINEERR_RESOURCEUNAVAIL The resource is unavailable.
LINEERR_NOMEM Not enough memory is available.
LINEERR_NODRIVER The driver cannot be found.
LINEERR_OPERATIONUNAVAIL  

Remarks

TAPI typically calls this function to update the set of detected media types for the line to the union of all modes selected by all outstanding lineOpens whenever a line is Opened or Closed at the TAPI level. A lineOpen function call attempt is rejected if media detection is rejected. A single call to this procedure is typically the result of a lineOpen call that does not specify the device identifier LINEMAPPER. The device identifier LINEMAPPER is never used at the TSPI level.

TAPI must compute the union of media types desired by all clients and pass the result to this function. The service provider uses the set passed to this function by TAPI. TAPI ensures that the dwMediaModes parameter has at least one bit set and that no reserved bits are set. The service provider must perform any further validity checks on the media types, such as checking whether any media types are indeed supported by the service provider. The union of all media types can be the value zero if the applications that have the line open are all either monitors or not interested in handling incoming calls.

There is no directly corresponding function at the TAPI level. This procedure corresponds to the "request media types" implied for the specific line by the lineOpen procedure when it is called with the specific device identifier (other than LINEMAPPER).

Requirements

OS Versions: Windows CE 3.0 and later.
Header: Tapicomn.h.
Link Library: Coredll.lib.

See Also

TSPI_lineClose

 Last updated on Saturday, April 10, 2004

© 1992-2003 Microsoft Corporation. All rights reserved.