[Freeswitch-users] How to prevent group_confirm_file from looping?

Hello! I'm trying to use the "group_confirm_file" functionality to prevent voicemail systems from answering my outbound calls to users. The problem I'm having is that there does not seem to be a way to prevent the "group_confirm_file" from looping/repeating. I only want the file to play ONE time then hang up if they do not press the "group_confirm_key". Currently, if someone ignores one of the calls (on their cell phone for example) and their voicemail system picks up, they will get a voicemail with the "group_confirm_file" audio. This is extremely annoying! How can I change this? Is it possible for me to write a module to change/correct this behavior? Thanks! Lyle