ISIM : IP Multimedia Services Identity Module

ISIM has following six modules stored.


Security keys :
Security keys consist of integrity keys, ciphering keys and key set identifiers. Integrity keys are used to prove integrity protection of SIP signalling. Ciphering keys are used to provide confidential protection of SIP signalling.

Private User Identity :
The private user identity simply contains the private user identity of the user. It is used in a registration request to identify the user’s subscription.

Public User Identity :
The public user identity contains one or more public user identities of the user. It is used in a registration request to identify an identity to be registered and is used to request communication with other users.

Home NW Domain Name :
The home network domain name consists of the name of the entry point of the home network name (address of the Interrogating-CSCF, or I-CSCF).

Administrative data:
Administrative data include various data, which could be used, say, by IMS subscribers for IMS operations or by manufacturers to execute proprietary auto-tests.

Access Rule Reference:
Access rule reference is used to store information about which personal identification number needs to be verified in order to get access to the application.