Hello guys. I'm new to IP PBX. Someone recommended Elastix. I want to know if IP phones with DND (do not disturb), Voice Mailbox buttons actually work as is? At a press of a button, it works? If IP phones missing the buttons that I need (such as record on demand button), are they programmable so that unused buttons can be assigned as record button? I'm thinking Atcom AT-620 IP Phone (http://www.atcom.cn/high%20resolution/AT620-1.jpg). Does the buttons under the LCD act as soft button on a cellphone, menu dependent? I don't want to have to memorize a long sequence of presses to activate "forward, conference, auto-answer, etc..."