A do not disturb system and method in a computer system at which communications such as voice calls and text messages are received. A user or process may set a computer system into a do not disturb mode, in which any communication routed through the machine will be evaluated against a set of rules to determine how that communication is to be handled, based on criteria such as the source of the communication and the type of communication. A notification and outgoing action is selected and performed in accordance with user-configurable settings. The outgoing action may include a return communication to the source of the communication indicating that the do not disturb mode is in effect.