Architecture for providing pre-authenticated information from an endpoint for subsequently authenticating a device and/or user associated with the previously-authenticated information. A pre-authentication module of the architecture can be a trust component as part of an application that facilitates the utilization of user information and/or endpoint information in a media session protocol message to replace information that would otherwise be gathered via a dialog. In the context of IP-based voice communications, a call can be made from a client that is pre-authenticable, and no longer requires that an IP-based telephone interact with the phone user to facilitate sign-on.