/mcplpdwNumDevs A pointer to a DWORD-sized location. Upon successful completion of this request, this location gets filled with the number of line devices that are available to the application. lpdwAPIVersion A pointer to a DWORD-sized location. The application must initialize this DWORD, before calling this function, to the highest API version that it is designed to support (for example, the same value that it would pass into dwAPIHighVersion parameter of lineNegotiateAPIVersion). Make sure that artificially high values are not used; ensure that the value is set to 0x00020000. TAPI translates any newer messages or structures into values or formats that the application supports. Upon successful completion of this request, this location is filled with the highest API version that TAPI supports, which allows the application to adapt to being installed on a system with an older TAPI version. lpLineInitializeExParams A pointer to a structure of type LINEINITIALIZEEXPARAMS that contains additional parameters that are used to establish the association between the application and TAPI (specifically, the selected event notification mechanism of the application and associated parameters). lineMakeCall The lineMakeCall function places a call on the specified line to the specified destination address. Optionally, you can specify call parameters if anything but default call setup parameters are requested. Function Details LONG lineMakeCall(HLINE hLine, LPHCALL lphCall, LPCSTR lpszDestAddress, DWORD dwCountryCode, LPLINECALLPARAMS const lpCallParams ); typedef struct LineParams { DWORD FeaturePriority; Parameters hLine A handle to the open line device on which a call is to be originated. lphCall A pointer to an HCALL handle. The handle is only valid after the application receives LINE_REPLY message that indicates that the lineMakeCall function successfully completed. Use this handle to identify the call when you invoke other telephony operations on the call. The application initially acts as the sole owner of this call. This handle registers as void if the reply message returns an error (synchronously or asynchronously). lpszDestAddress A pointer to the destination address. This parameter follows the standard dialable number format. This pointer can be NULL for non-dialed addresses or when all dialing is performed by using lineDial. In the latter case, lineMakeCall allocates an available call appearance that would typically remain in the dial tone state until dialing begins. Cisco Unified TAPI Developers Guide for Cisco Unified Communications Manager, Release 15 and SUs 177 Basic TAPI Implementation lineMakeCall