4. Safety in IMS
Various safety mechanisms are provided in Rel-5/Rel-6 to ensure safety in the IMS:
user authentication and IPSec tunnelling between the terminal and the P-CSCF during IMS registration;
the introduction of security gateways between security domains;
the I-CSCF(THIG) function at the "home" network output (between the caller's S-CSCF and the called party's I-CSCF).
4.1 Authentication
The mechanism used for authentication is IMS-AKA (Authentication and Key Agreement), based on the use of a secret shared between the user (on the ISIM or, failing that, the USIM) and the IMS network (at the HSS level). The HSS, always located in the user's...
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Safety in IMS
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