Do Not Disturb (DND) is a common feature in enterprise telecommunications. When it is enabled, it prevents the telephone from ringing. Basic principle A traditional landline telephone system also known as "plain old telephone service" (POTS, commonly handles both signaling and audio information The implementation of this features is vendor-specific. In some cases, the ringer just does not ring and the called party is thus not alerted. Usually, though, the phone just acts as being busy. Depending on the infrastructure, the caller may end up on the called party's voice mailbox, sometimes after a certain delay. Voicemail (or voice mail voice-mail vmail or VMS, sometimes called messagebank) is a centralized system of managing Telephone messages for a large group
Some special configurations combine DND with other features like call forwarding, where calls to a party with DND on are forwarded to another phone. Call forwarding (or call diverting) in Telephony, is a feature on some telephone networks that allows an incoming call to a Called party, which would be