Remote agent dispositions for Answering Machine

I have an autodial campaign setup with a remote agent. It has different messages for answering machine or human. I have everything working accept when I run a VDAD report it shows all calls being dispositioned as 'AL'. I need the Answering Machine calls to be dispositioned as 'AM' so they may be queried to run another campaign. Am I missing a setting somewhere? or would I need to modify a script to make this happen. I am trying to do as few modifications to code as possible.