Siri lost her voice!
I am having the exact same problem. Siri processes what I am saying and responds only throught the text bubbles. No voice. Also, when I press and hold the home button to activate Siri, there is no beep beep. This has been going on for a day or so. AT&T as well as Apple representatives walked me through my settings and everything was correct. Apple rep said that there are kinks with Siri that they are trying to work out and while doing so, it could interrupt something else. I hope like the other similar situation that this corrects itself soon. The Apple rep seemed to think that it would. We will see! I miss Siri! lol