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TSPI_lineSetCallQualityOfService function (tspi.h)

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The TSPI_lineSetCallQualityOfService function service provider attempts to renegotiate the QOS on the call with the switch If the desired QOS is not available, then the function fails, but the call continues with the previous QOS. If the function succeeds, the new QOS information is stored in LINECALLINFO; a LINECALLINFOSTATE_QOS message is sent by the service provider to indicate the updated values.

Syntax

LONG TSPIAPI TSPI_lineSetCallQualityOfService(
  DRV_REQUESTID dwRequestID,
  HDRVCALL      hdCall,
  LPVOID        lpSendingFlowspec,
  DWORD         dwSendingFlowspecSize,
  LPVOID        lpReceivingFlowspec,
  DWORD         dwReceivingFlowspecSize
);

Parameters

dwRequestID

Identifier for reporting asynchronous function results.

hdCall

The service provider's handle to the call.

lpSendingFlowspec

Pointer to memory containing a WinSock2 FLOWSPEC structure followed by provider-specific data. The provider-specific portion following the FLOWSPEC structure must not contain pointers to other blocks of memory in the application process, because TAPI does not know how to marshal the data pointed to by the private pointer(s) and convey it through interprocess communication to the service provider.

dwSendingFlowspecSize

The total size in bytes of the FLOWSPEC and accompanying provider-specific data, equivalent to what would have been stored in SendingFlowspec.len in a WinSock2 QOS structure.

lpReceivingFlowspec

Pointer to memory containing a WinSock2 FLOWSPEC structure followed by provider-specific data. The provider-specific portion following the FLOWSPEC structure must not contain pointers to other blocks of memory in the application process, because TAPI does not know how to marshal the data pointed to by the private pointer(s) and convey it through interprocess communication to the service provider.

dwReceivingFlowspecSize

The total size in bytes of the FLOWSPEC and accompanying provider-specific data, equivalent to what would have been stored in ReceivingFlowspec.len in a WinSock2 QOS structure.

Return value

Returns dwRequestID if the asynchronous operation starts; otherwise, the function returns one of these negative error values:

LINEERR_INVALCALLSTATE, LINEERR_INVALRATE, LINEERR_NOMEM, LINEERR_OPERATIONFAILED, LINEERR_RATEUNAVAIL, LINEERR_RESOURCEUNAVAIL.

Requirements

Requirement Value
Target Platform Windows
Header tspi.h

See also

LINECALLINFO