The IP Office CTI Link is available in Lite and Pro versions, which provide run-time interfaces for applications to use. The Software Development Kit (SDK) provides documentation on both Lite and Pro interfaces for software developers.

Both the Lite and Pro offerings are the same program. The additional functionality provided by IP Office CTI Link Pro is enabled when the CTI Link Pro licence key is installed. It is recommended that the reader of this document has access to the Microsoft Developer Network (MSDN) Library, which provides a complete TAPI reference.

The TAPI driver for IP Office supports all TAPI versions from 2.0 to 3.0.