This document specifies a means for transporting authenticated identity info during Session Initiation Protocol signaling without the need for a fully deployed Public Key Infrastructure. The established trust is transfered to the following media session and used to perform secure key agreement between the end-points for encryption of the media session.

This paper was written as a final year project assignment by Jøran Vagnby Lillesand at Department of Telematics at the Norwegian University of Science and Technology.