LINE_APPNEWCALL - Telephony API Programmer's Reference

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LINE_APPNEWCALL

The LINE_APPNEWCALL message is sent to inform an application when a new call handle has been spontaneously created on its behalf (other than through an API call from the application, in which case the handle would have been returned through a pointer parameter passed into the function).

LINE_APPNEWCALL
dwDevice = (DWORD) hLine;

dwCallbackInstance = (DWORD) dwInstanceData;

dwParam1 = (DWORD) dwAddressID;

dwParam2 = (DWORD) hCall;

dwParam3 = (DWORD) dwPrivilege;

Parameters
dwDevice

The application's handle to the line device on which the call has been created.

dwCallbackInstance

The callback instance supplied when opening the call's line.

dwParam1

Identifier of the address on the line on which the call appears.

dwParam2

The application's handle to the new call.

dwParam3

The applications privilege to the new call (LINECALLPRIVILEGE_OWNER or LINECALLPRIVILEGE_MONITOR).

Return Values
No return value.

Comments and Backward Compatibility
Applications supporting TAPI version 0x00020000 or above are sent a LINE_APPNEWCALL message whenever the application is spontaneously given a handle to a new call. Because the message includes the hLine and dwAddressID on which the call exists, the application can readily create a new call object in the correct context. The LINE_APPNEWCALL message will always be immediately followed by a LINE_CALLSTATE message indicating the initial state of the call.

Older applications (which negotiated an API version prior to 0x00020000) are sent only a LINE_CALLSTATE message, as documented in previous versions of the API. Such applications would create a new call object upon receiving a LINE_CALLSTATE message which has dwParam3 set to a non-zero value and containing a call handle not presently known by the application. The disadvantages are that (a) the application must call lineGetCallInfo to determine the hLine and dwAddressID associated with the call, (b) the application must scan all known call handles to determine that the call is a new call, and (c) it is possible, under certain conditions, for the application to think it is receiving a new call handle when in reality it has just deallocated its handle to the call (for example, the application has just deallocated a call handle, but a LINE_CALLSTATE message giving the application ownership of the call due to a lineHandoff from another application was already in the application's TAPI message queue).

See Also
LINE_CALLSTATE, lineGetCallInfo, lineHandoff

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