Securisation of SIP Presence notifications thanks to the Belgian electronic identity card

This article is dealing with the use of the Belgian electronic ID card to secure Presence notifications in the session initiation protocol (SIP). More specifically, it addresses the secure authentication to a SIP registrar server thanks to the Belgian electronic ID card. The proposed solution consists in adding an authenticated identity body (AIB) to the REGISTER requests issued by the user's agent, which simultaneously authenticates the user and protects the request header.