dub: Seems similar to 'automatic handwriting'. (It can be learned). In your case it's voices.
You might check out the 'mechanism' of automatic handwriting and see if it helps you understand.
Have you asked the voice who it is? What does it want ? Ask it what will it say next? Does it want to help you? etc.
Ask it something you don't know, and see if it has access to info that you don't. (I'd like to hear the answer to that question).