name: ISIM
full_form: IMS Subscriber Identity Module
context: For the purposes of this document the ISIM is a term that indicates the collection of IMS security data and functions on a UICC. The following implementation options are permitted: - Use of a distinct ISIM application on a UICC which does not share security functions with the USIM; - Use of a distinct ISIM application on a UICC which does share security functions with the USIM; - Use of a USIM application on a UICC. NOTE 1: For later releases other implementations of ISIM are foreseen to be permitted. NOTE 2: The distinction between the terms âISIMâ and âISIM applicationâ is useful for the purpose of describing the IMS security architecture. However, in other 3GPP specifications these terms are used as synonyms, i.e. the term âISIMâ always refers to the ISIM application in the UICC, as defined in [51]. The case of using a USIM application is always handled separately in other specifications. If there is an ISIM application and a USIM application on a UICC, then the ISIM application
description: The IMS Subscriber Identity Module (ISIM) is a component or application within a Universal Integrated Circuit Card (UICC) that stores and manages security data and functions for IMS services. It can be implemented as a distinct application on the UICC, sharing or not sharing security functions with the USIM, or it can utilize the USIM application itself.
explanation: The ISIM is described as a component within a UICC, a type of telecommunications hardware. Its function is to manage security data and functions for IMS services, placing it firmly within the category of a Device.
section_title: 8.0	General
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biotag_Description: O,B-Device,I-Device,I-Device,I-Device,O,O,O,O,O,O,O,O,B-Device,I-Device,I-Device,I-Device,O,O,O,O,O,O,O,O,O,O,B-Network,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Device,O,O