A large part of the issue is that if you are dealing with phone meetings, audio is severely compressed, and not very similar to the training data that Watson ha

A large part of the issue is that if you are dealing with phone meetings, audio is severely compressed, and not very similar to the training data that Watson has been taught with. Google Voice might be able to do a better transcription, because they have much more data from phone messages to work with, but eventually it comes down to the fact that voices over a phone line are a lot harder to understand without context processing than voices recorded with a decent microphone.