@dennisvdvliet At the moment, the IBM Watson APIs for Speech to Text are in "beta" and don't support personalisation training. I was impressed that it works well without any training. When they launch training, you should be able to get very accurate results.
@tommoor Speech translation lag is the main issue at the moment with Phonebot. It's a neat demo but would need a better real-time translation engine to be usable in the real world. It would also be better if Twilio exposed the real-time audio stream through their API.
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