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IP Multimedia Services Identity Module

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This is an old revision of this page, as edited by Cydebot (talk | contribs) at 03:20, 23 January 2009 (Robot - Moving category GSM standard to Global System for Mobile communications per CFD at Wikipedia:Categories for discussion/Log/2009 January 17.). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

An IP Multimedia Services Identity Module (ISIM) is an application running on a UICC smart card in a 3G mobile telephone in the IP Multimedia Subsystem (IMS). 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.

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