A method and system for providing anonymous sidebars between participants in a existing conference session such as a push-to-talk session for instance. Each applicable participant in the session has a private handle that represents the participant but that does not reveal the true identity of the participant. Further, the conference server hosting the session maintains or has access to mapping data that correlates each participant's private handle with a participant identifier that is sufficient to allow the conference server to engage in network communication with the participant. The server provides each participant with a list of other participant's private handles, and a given participant can then initiate a sidebar by sending a sidebar-initiation request designating one or more private handles selected from the list. Using its mapping data, the server then identifies the corresponding participants and sets up the anonymous sidebar.