TSPI_lineAccept

  • 项目

This function accepts the specified offered call. It can optionally send the specified user-user information to the calling party.

LONG TSPIAPI TSPI_lineAccept(
  DRV_REQUESTID dwRequestID, 
  HDRVCALL hdCall, 
  LPCSTR lpsUserUserInfo, 
  DWORD dwSize 
);

Parameters

  • dwRequestID
    Identifier of the asynchronous request.
  • hdCall
    Handle to the call to be accepted. The call state of hdCall can be offering.
  • lpsUserUserInfo
    Pointer to a null-terminated Unicode string containing user-user information to be sent to the remote party as part of the call accept. This pointer is NULL if no user-user information is to be sent. User-user information is only sent if supported by the underlying network. See LINEDEVCAPS.
  • dwSize
    Size, in bytes, of the user-user information in lpsUserUserInfo. If lpsUserUserInfo is NULL, dwSize is ignored.

Return Values

Returns dwRequestID if the function is completed asynchronously or an error number if an error occurs. The lResult parameter of the corresponding ASYNC_COMPLETION is zero if the function succeeds or an error number if an error occurs. The following table shows the return values for this function.

Value Description
LINEERR_INVALCALLHANDLE The handle to the call was invalid.
LINEERR_OPERATIONFAILED The operation failed.
LINEERR_INVALCALLSTATE The call state is invalid.
LINEERR_RESOURCEUNAVAIL The resource is unavailable.
LINEERR_USERUSERINFOTOOBIG The user user info is too big.
LINEERR_NOMEM Not enough memory is available.
LINEERR_OPERATIONUNAVAIL The operation is unavailable.

Remarks

The TSPI_lineAccept function is used in telephony environments (such as ISDN) that allow alerting associated with incoming calls to be separate from the initial offering of the call. When a call comes in, the call is first offered. For some small time duration, the client application may have the option to reject the call using the TSPI_lineDrop function, redirect the call to another station using the TSPI_lineRedirect function, answer the call using the TSPI_lineAnswer function, or accept the call using TSPI_lineAccept. After a call has been successfully accepted, alerting at both the called and calling device begins, and typically the call state transitions to the accepted state. The service provider must set the flag LINEADDRCAPFLAGS_ACCEPTTOALERT in the dwAddrCapFlags member of the LINEADDRESSCAPS data structure if the application must call TSPI_lineAccept for alerting to begin.

To TAPI, alerting is reported using the LINE_LINEDEVSTATE message with the ringing indication.

TSPI_lineAccept may also be supported by non-ISDN service providers. The call state transition to the accepted state can be used by other TAPI clients as an indication that some application has claimed responsibility for the call and has presented the call to the user.

The client application has the option to send user-user information at the time of the accept. Even if user-user information can be sent, often no guarantees are made that the network will deliver this information to the calling party. The client application may consult a line's device capabilities to determine whether call accept is available.

Requirements

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

See Also

LINEDEVCAPS | TSPI_lineAnswer | TSPI_lineDrop | TSPI_lineOpen | TSPI_lineRedirect

 Last updated on Saturday, April 10, 2004

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