The TSPI_lineSendUserUserInfo function sends user-user information to the remote party on the specified call.

LONG TSPIAPI TSPI_lineSendUserUserInfo(
HDRVCALL hdCall,            
LPCSTR lpsUserUserInfo,     
DWORD dwSize );



The identifier of the asynchronous request.


The handle to the call on which to send user-user information. The call state of hdCall can be connected, offering, accepted, or ringback.


A pointer to a null-terminated Unicode string containing user-user information to be sent to the remote party. User-user information is only sent if supported by the underlying network (see LINEDEVCAPS).


The size, in bytes, of the user-user information in lpsUserUserInfo.

Return Values

Returns dwRequestID, or an error number if an error occurs. The lResult actual parameter of the corresponding ASYNC_COMPLETION is zero if the function succeeds, or an error number if an error occurs. Possible return values are as follows:



This function can be used to send user-user information at any time during a connected call. If the size of the specified information to be sent is larger than what can fit into a single network message (as in ISDN), the service provider is responsible for breaking the information up into a sequence of chained network messages (using "more data").

User-user information can also be sent as part of call accept, call reject, call redirect, and when making calls. User-user information can also be received. The received information is reported in the call's LINECALLINFO structure. Whenever user-user information arrives after call offering or prior to call disconnect, a LINE_CALLINFO message with a UserUserInfo parameter notifies TAPI that user-user information in the call-information record has changed. If multiple network messages are chained, the information is assembled by the service provider and a single message is sent to TAPI.


Runs On Versions Defined in Include Link to
Windows CE OS 3.0 and later Tapicomn.h   Coredll.lib

Note   This API is part of the complete Windows CE OS package as provided by Microsoft. The functionality of a particular platform is determined by the original equipment manufacturer (OEM) and some devices may not support this API.

See Also

TSPI_lineAccept, TSPI_lineDrop, TSPI_lineGetCallInfo, TSPI_lineMakeCall, TSPI_lineRedirect

 Last updated on Tuesday, July 13, 2004

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