The following sections contain an alphabetic list of functions grouped by area. The information for each function includes a list of the valid call states on entry of the function and typical call state transitions when the request is complete.
For TAPI functions categorized by service level and task, see TAPI Quick Function Reference.
Please note that service provider limitations may exist concerning the actual states in which a function can be performed. Applications must check the dwCallFeatures member in the LINECALLSTATUS structure, the dwAddressFeatures member in the LINEADDRESSSTATUS structure, and the dwLineFeatures member in the LINEDEVSTATUS structure to determine whether or not a function is permitted within the current call state.