Our client is a major insurance company that uses an Interactive Voice Response system to provide information to their users based on requests. We performed a detailed end-to-end testing of the system for all of the IVR call flows. A properly functioning IVR that is easy to iterate increases client satisfaction and reduces operating costs. In order to effectively test the system, we used twilio and vxml. We also performed regression tests to ensure that no interferences with other software occured after changes were made.