Apparatus for constructing a digital telephone message including a message defining unit, configured for allowing a sender to define a message for sending to a recipient, and a response defining unit, configured for allowing the sender to predefine a recipient response, and to include the predefined recipient response in the message for activation at the recipient. Apparatus for receiving a digital telephone message, the message including an activatable sender-defined response, the apparatus including a receiving unit for receiving the message, a notification unit for notifying a recipient of the arrival of the message, and a response activation unit for displaying the sender-defined response, and associating the sender-defined response with a user action for providing user input to send the response. Related apparatus and methods are also described.