Yes... if there's no recorded name the extension number of the subscrbier will be played in stead. This will kick in for auto attendant transfers that get to that subscriber's greeting and for subscriber to subscriber message addressing.
However, for outside callers using the alpha directory (i.e. folks spelling names of subscriber to find them in the directory) if the user does not have a recorded voice name then they wont be listed. Doesn't make much sense to spell a name and in the list get a bunch of extension numbers... you'd have no way of knowing which one was the person you wanted.
there's no snappy way to delete voice names for other folks easily in bulk. You can do it individually over the phone, but the fastest way to do it for large numbers of folks would be via DOHPropTest for which you'll need a password to write changes through...
Can I ask why you're wanting to delete voice names?
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