The standard protocol for this sort of thing is to use the NATO phoenetic alphabet for letters.
Sierra Golf one zero zero zero zero zero zero seven one two zero alpha dash november bravo.
Note that British English speakers have a tendency to say 'double ----" or 'triple -----" when there are two or three identical numbers together in a series. For example : 488329777 - four double eight three two nine triple seven,
In my experience, American English speakers find this confusing, so avoid using it unless you are sure your listener is comfortable with this form of expression.