Controlling the volume of an audible alert associated with an instant messaging communications session includes rendering, on a first instant messaging user system, an instant messaging application user interface for an instant messaging communications session involving at least a first instant messaging user and a second instant messaging user, receiving notification of an event related to the instant messaging communications session, determining a characteristic of the event, accessing an audible alert to be rendered to signal existence of the event, adjusting based upon the determined characteristic of the event a volume of the audible alert corresponding to the event, and rendering the audible alert to signal existence of the event.