FusionPBX w/Polycom VVX Reject Call to Voicemail

Has anyone had any luck redirecting a rejected call on a Polycom VVX phone (I'm using VVX 410's) and FusionPBX to voicemail? Currently the calls go straight the busy tone when the user hits the reject button.

If they ignore the call and let it ringer time finish, it routes correctly to voicemail. I'm looking for the same behavior, immediately, if they hit reject. Thanks in advance!