Unauthenticated Packet Switched (PS) emergency calls
The present document gives an overview of the problems related to Unauthenticated PS based Emergency Calls (UAPSEC) and provides information on this topic in comparison to the existing unauthenticated CS based emergency call.
Major areas of work the document takes into account are security aspects, architectural aspects and signalling aspects. It also considers the case where the subscriber has got a PS subscription but no subscription to IMS services.
The document explains on the differences between the scenarios that allowed unauthenticated CS emergency calls without encountering too big problems and the scenarios that make Unauthenticated PS based Emergency Calls different in this respect.
It elaborates on these new scenarios, for example on the Distributed Denial of Service Attacks (DDOS) scenario.