Version 1.2 is compiled with Platform Target set to "Any CPU" and supports native 64-bit mode. On a 64-bit operating system Traysoft.AddTapi.dll assembly is loaded as a 64-bit DLL and it uses 64-bit TAPI. Please note that some telephony hardware does not have 64-bit drivers and will not work on a 64-bit OS. Please confirm with your supplier that the hardware you are planning to use has 64-bit drivers and works on a 64-bit OS.

In addition to TAPI 2.0-2.2, new version of AddTapi.NET supports telephony service providers (TSP) that implement version 1.3 or 1.4 of TAPI interface.

Version 1.2 adds Guid property that applications can use to track calls through all call-related events or to store call information in a database. Tag property can be used to store application-specific information associated with the call or the caller for easy access in call-related events.

Reason, Origin, RedirectionID, RedirectingID, Display properties were added to the TapiCall class to provide additional information about a call.

Version 1.2 adds CallInfo event and TapiCallInfoState enumeration to notify applications when the information about a call changes.

Using CallState event an application can get notifications about all call state changes. Extended TapiCallState enumeration provides more information about call states.

Version 1.2 adds GetCommHandle method that returns a handle of the open communication port. This handle can be used to transfer data between the application and the remote terminal.