ASR without underlying grammar?

Hi,

as far as I understood the specification, there is no possibility to have
ASR without specifying an active grammar in VoiceXML. What if the author
cannot provide a grammar, in cases where the input can't be constrained?
(e.g. when giving proper names) Does VoiceXML deal with that problem?
As a solution, the user could spell the name out, using a built-in grammar
for a phonetic alphabet ("Andrew, Benjamin, Charlie" etc., or anything
equivalent for a specific language), and the Voice Browser could
nevertheless treat the result as if it was uttered properly.
Regards
Tobias Goebel,-