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IP Multimedia Services Identity Module

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An IP multimedia Services Identity Module is an application running on a UICC smartcard in a UMTS release 5 enabled 3G telephone. It contains parameters for identifying and authenticating the user to the IMS. The ISIM application can co-exist with SIM and USIM on the same UICC making it possible to use the same smartcard in both GSM networks and earlier releases of UMTS.

The ISIM contains a private user identity (a NAI address, username@operator.com), one or more public user identities (a SIP, sip:user@operator.com, or TEL, tel:+1-212-555-12345, address) and a long-term secret used to authenticate and calculate cipher keys.

See also

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