[asterisk-biz] Asterisk and Yext.com's (on the fly) call transcription..

Folks,

Does anyone have a clue on how Yext transcribes the calls (almost) on the fly?
I am pretty sure they are using asterisk at the heart and perhaps using some neat APIs for call transcription.
If you are know of any outfit there that provides similar APIs, please ping me...

If anyone is interested in learning more about Yext, here is the video demo of their interesting demo at TC50

http://www.ustream.tv/recorded/2163590

Thanks,
--
Ritesh
PS: I have no relations with Yext, not even as a customer ;-)
Just curious about the technology since it could help many Asterisk based apps including one of mine...