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The IMSS was founded by Mexican President Manuel Ávila Camacho on January 19, 1943 to satisfy the legal precepts established in the Article 123 of the Mexican Constitution. It is constituted by representations of the workers, employers, and the federal government. It is the largest social welfare institution in all Latin America. [citation needed]
The security in IMS is based on a secret key of long duration shared between the ISIM and the AUC (Authentication Center) of the local network. ISIM: it is an application that runs on a smart card UICC (Universal Integrated Circuit Card) that contains the identification parameters and authentication of the IMS user.
The IP multimedia subsystem (IMS) is a core network subsystem within UMTS. It is based on the use of the Session Initiation Protocol (SIP)26 to initiate, terminate and modify multimedia sessions such as voice calls, video conferences, streaming and chat. SIP is specified by the Internet Engineering Task Force (IETF)27.
3GPP / TISPAN IMS architectural overview 3GPP / TISPAN IMS architectural overview – HSS in IMS layer (as by standard) Each of the functions in the diagram is explained below. The IP multimedia core network subsystem is a collection of different functions, linked by standardized interfaces, which grouped form one IMS administrative network. [ 7 ]