[Freeswitch-users] Voicemail - see if user left a message?

Can the xml_cdrs tell me if the user actually left a voicemail, rather than merely that VM picked up? I don't see where. I know it's on ESL, and it hits the voicemail email code.. what's the easiest way to integrate it with the CDRs? preferably with the xml_cdrs? Maybe a patch to the xml_cdr mod? Or the easiest is to have mod_voicemail set a channel variable once a voicemail gets marked as saved or the like? Is there currently a solution for this that I missed? Thanks, -Avi