The first thing to know when exploring human voice technology is that although people commonly say "voice recognition," they actually mean "speech recognition." Speech recognition is interpreting a string of sounds into meaningful words and sentences. Voice recognition, or more appropriately, speaker recognition, is what you do when you pick up the phone, hear two words, and realize it's your Mother on the other end.
My impression is speech technology professionals avoid using the term "voice recognition." However, if you're in marketing, this term seems very popular with the general populace, so know your audience!