I'm a little new at this. I have a business that answers their phone during the day. All of their exts have VM. They want their callers to get a greeting after hours that says they a currently closed but if they have an emergency to call John Smith at XXX-XXXX. They want this message to play M-F 5:00pm to 8:00am(after hrs) and all day on Sat & Sun. They also want a manuel button at their receptionists' ext to turn on night service manually for random days they are closed. Can someone explain to me how to do this. Thanks in advance