Voicemail is a computer based system that allows users and subscribers to exchange personal voice messages to select and deliver voice information; and to process transactions relating to individuals, organizations, products and services, using an ordinary telephone.
Voice-mail systems are designed to convey a caller's recorded audio message to a recipient. To do so they contain a user interface to select, play, and manage messages a delivery method to either play or otherwise deliver the message and a notification ability to inform the user of a waiting message. Most systems use phone-networks, either cellular or land-line based, as the conduit for all of these functions. Some systems may use multiple telecommunications methods, permitting recipients and callers to retrieve or leave messages through multiple devices.