I am a voice talent, and the answer is pretty much in your question.
Voice acting requires acting training alongside learning how to use your voice behind a mic.
The market is getting tougher, so if you are thinking of going into this, also start learning audio engineering skills, too.
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A good acting education can give you the skills needed to perform, but if your planning on making a career out of it you need to understand business as well. I would reccomend you go to I Want To Be A Voice Actor.com. This site was made by Dee Bradley Baker, one of the best voice actors out there, to answer questions like this.