An IP Multimedia Services Identity Module (ISIM) is an application residing on the
UICC, an
IC card specified in TS 31.101. This module could be on a
UMTS
The Universal Mobile Telecommunications System (UMTS) is a third generation mobile cellular system for networks based on the GSM standard. Developed and maintained by the 3GPP (3rd Generation Partnership Project), UMTS is a component of the In ...
3G or
IMS Ims is a Norwegian surname. Notable people with the surname include:
* Gry Tofte Ims (born 1986), Norwegian footballer
* Rolf Anker Ims (born 1958), Norwegian ecologist
See also
* IMS (disambiguation) Ims is a Norwegian surname. Notable people wit ...
VoLTE
Voice over LTE (VoLTE) is an LTE high-speed wireless communication standard for mobile phones and data terminals, including Internet of things (IoT) devices and wearables. VoLTE has up to three times more voice and data capacity than older 3G ...
network. 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
The Global System for Mobile Communications (GSM) is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation ( 2G) digital cellular networks used by mobile devices such as ...
networks and earlier releases of
UMTS
The Universal Mobile Telecommunications System (UMTS) is a third generation mobile cellular system for networks based on the GSM standard. Developed and maintained by the 3GPP (3rd Generation Partnership Project), UMTS is a component of the In ...
.
Among the data present on ISIM are an
IP Multimedia Private Identity (IMPI), the home operator
domain name
A domain name is a string that identifies a realm of administrative autonomy, authority or control within the Internet. Domain names are often used to identify services provided through the Internet, such as websites, email services and more. ...
, one or more
IP Multimedia Public Identity (IMPU) and a long-term secret used to authenticate and calculate cipher keys. The first IMPU stored in the ISIM is used in emergency registration requests.
External links
3GPP TS 31.101 UICC-terminal interface; Physical and logical characteristics3GPP TS 31.103 Characteristics of the IP Multimedia Services Identity Module (ISIM) application- ISIM standard
3GPP TS 24.229 IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3
Mobile telecommunications standards
3GPP standards
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