Question: How do I convert text message to high quality voice and deliver it to cell phones? Can you provide me an API for such task. These text messages would be different for different customers.

Install the "Shout Out" app from the app Bazaar. In the text box, put in a URL that can return back text. This URL will receive the same parameters as the Passthru appletPassthru applet. As phone number is one of the parameters, your URL can return back different text for different callers & the content will be read out using our Text to Speech engine. 

Read more about greeting callers using dynamic text or audio.