Telephony has traditionally required complicated hardware and software or specialized programming languages. Companies for years have been providing customer self-service apps as Interactive Voice Response (IVR) systems as a way of boosting customer satisfaction while cutting service costs. “Have you ever wanted your Google Talk number to be answered by your code? Tropo cloud communications platform is a mashup created for the San Francisco Bay Area Rapid Transit (BART) schedules so you can see when the next train is due to arrive at the station of your choice. Call or SMS (407) 374-9954 or send an IM to firstname.lastname@example.org with Google Talk to try it. You can even talk to @tropobart on Twitter. Tropo treats Twitter as an IM network, sending all @mentions to your app just like an instant message would be. Tropo works by converting phone calls, IMs, and text messages to API calls that your code works with. An incoming call or message is delivered to your code and your code tells Tropo what to say back,” explains Google.
"The code behind this can sit in our cloud or on web server of your choice, including Google App Engine. Other sample apps are available covering everything from simple games to directory assistance, to checking into Foursquare," writes Google.