Enhances security for IMS client

Migration to next generation networks (NGN) is becoming a necessity for Telco companies to follow the telecommunications industry evolution. However, NGN as proposed by the 3GPP implies significant challenges for the deployment. Indeed IMS architecture, which is considered as one of NGN network, includes significant security weaknesses for users and service providers. In order to increase the degree of confidence to the use of this network it is necessary to enhance the security of its different communication interfaces. To achieve this aim, we propose in this work a highlighting of the vulnerability in IMS access layer, focusing in possible attacks. We also propose a comparative study of existing security solutions in this field. This work will provide a significant improvement of existing solutions to enhance security for IMS user's access.