/mcpFunction Details LONG WINAPI phoneInitializeEx( LPHPHONEAPP lphPhoneApp, HINSTANCE hInstance, PHONECALLBACK lpfnCallback, LPCSTR lpszFriendlyAppName, LPDWORD lpdwNumDevs, LPDWORD lpdwAPIVersion, LPPHONEINITIALIZEEXPARAMS lpPhoneInitializeExParams ); Parameters lphPhoneApp A pointer to a location that is filled with the application usage handle for TAPI. hInstance The instance handle of the client application or DLL. The application or DLL can pass NULL for this parameter, in which case TAPI uses the module handle of the root executable of the process. lpfnCallback The address of a callback function that is invoked to determine status and events on the line device, addresses, or calls, when the application is using the "hidden window" method of event notification (for more information, see phoneCallbackFunc). When the application chooses to use the event handle or completion port event notification mechanisms, this parameter gets ignored and should be set to NULL. lpszFriendlyAppName A pointer to a null-terminated string that contains only displayable characters. If this parameter is not NULL, it contains an application-supplied name for the application. This name, which is provided in the PHONESTATUS structure, indicates, in a user-friendly way, which application has ownership of the phone device. If lpszFriendlyAppName is NULL, the application module filename gets used instead (as returned by the Windows function GetModuleFileName). lpdwNumDevs A pointer to a DWORD. Upon successful completion of this request, the number of phone devices that are available to the application fills this location. lpdwAPIVersion A pointer to a DWORD. 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 phoneNegotiateAPIVersion). Do no use artificially high values; ensure the values are accurately set. TAPI translates any newer messages or structures into values or formats that the application version supports. Upon successful completion of this request, the highest API version that TAPI supports fills this location, which allows the application to detect and adapt to being installed on a system with an older version of TAPI. lpPhoneInitializeExParams A pointer to a structure of type PHONEINITIALIZEEXPARAMS that contains additional parameters that are used to establish the association between the application and TAPI (specifically, the application-selected event notification mechanism and associated parameters). Cisco Unified TAPI Developers Guide for Cisco Unified Communications Manager, Release 15 and SUs 284 Basic TAPI Implementation phoneInitializeEx