The present invention uses a list management server for specifying conference participants in an IMS environment. More specifically, a conference list can be established for a standard list management server. The conference list can be a group list that is identified with a unique public URI. The group list can include multiple members, where each member can be identified by a member URI. Members can be specific participants associated with a user specific URI and/or can be a group of participants. When the conference is initiated, a new communication session can be instantiated and a conferencing application execute. After session instantiation, participants included in the conference list can join the session.