I've had a pdoc explain that if you consider the voice to be something different than yourself, then it is worth bringing up. I have actual "external" auditory hallucinations, not of voices, but of ringing phones and footsteps (someone walking up behind me.) I can't tell the difference between real and not real when they happen.

I also talk to myself and there is a "voice" that talks back, but it isn't a person or thing, it's like another bit of me and I have long discussions with it and running dialog.