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Over the latest few years, most of the major telephony and services providers have got their attention on the LTE/SAE solution, in the attempt of getting the most bandwidth and features at the least implementation and operating price. One of the major challenges that 3GPP, the creator of LTE/SAE architecture, has faced is the IMS integration with SAE. The latest standard version available at this moment on IMS integration and its security challenges is TS 33.203, which is focused on 3G security aspects. When talking about IMSSIP security, there are several studies that propose end-to-end security for a SIP conversation over EPS infrastructure.
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