On hold IVR menu allowing callers to press a button to be transferred to Voicemail

Current IVR menus allow 0-9 button to be programmed to send to Voicemail of specified extension. It would be nice for the caller to have the ability to hit the programmed number and transferred to voicemail as an alternative option to waiting. This would allow us to lengthen maximum call time in the group for those who prefer to wait for someone.