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To give you one thing, the FBI, CIA and other institutions employ linguistics who are able to tell you the gender, age, race, educational level and almost definite REGION somebody comes from by listening to a message left on an answering machine. So being able to tell differences and spot things that "give the speaker" away is something that quite some people can.
I have to admit I cannot tell too many differences. If you can, kudos to you. People might react offended because they think you are trying to hint at something by telling them you can tell their "race" via the phone, I think I might sense something swinging with those words if I was black and talking to you (white) on the phone.
"Why is this?" "Black" voices, if there even is such a thing - there hardly is, it is more the kind of language spoken in your family, the region you grew up in, the traditions kept in your family, the kind of school you went to, all kinds of factors that influence your range of vocab and the way you express yourself - tend to be "darker" if you compare them to voices by Asian people, for instance, or Caucasian, though that is a BROAD and very, very (unjustified) generalization. It is true, however, that, for instance, Asian speaker tend to have "higher", that is: lighter voices than your average European. It is not racist to state that, it is to do with your vocal cords and nothing else. :)
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- The most educated answer, without thinking I was being racist