You can clone with
HTTPS or Subversion.
A set of PHP classes for working with the Tropo WebAPI.
The main Tropo Classes used for building cloud communication apps.
The Result Class, used to inspect results sent back from the Tropo platform when a user enters input.
The Session Class, which provides detailed information about the current user session.
The Tropo Helper Classes, which make life easier for PHP programmers.
A series of articles covering how to use these classes to build multi-modal applications can be viewed here.