[mdaniel]

All the voice recognition packages I've used have a dedicated "spell this" mode, usually activated by a hot word like "spell" or similar. In the dedicated mode, my recollection is that one can use the phonetic alphabet (alpha, bravo, charlie, etc) in lieu of trying to get it to recognize the names of the letters, which are usually monosyllable and thus harder to pick up.

I haven't tried the system under discussion to know if it has such a mode or not.