name: IMS
full_form: IP Multimedia Subsystem
context: The present annex defines test cases dedicated to IMS for Converged IP Communications, i.e., the provision of multi-media telephony, exercising scenarios described in GSMA PRD NG.102 [144]. Within this Annex, the UE is assumed to attach via an E-UTRAN or EPC-integrated WLAN access network. As described in section 1.1 of GSMA PRD NG.102 [144], the following network deployments are supported: - a converged IMS core network (i.e. supporting all Converged IP Communications Services), or - two separate IMS core networks (i.e. one IMS core network supporting Multimedia Telephony and SMSoIP and another IMS core network supporting all other advanced messaging services excluding both Multimedia Telephony and SMSoIP). The network deployments described above require that the UE supports: - a single IMS registration to a single IMS core network; and - two separate IMS registrations, either to a single IMS core network or to two separate IMS core networks.
description: The IP Multimedia Subsystem (IMS) is a network architecture for delivering multimedia services over IP networks. It enables the provision of multi-media telephony and other advanced messaging services, supporting converged IP communications.
explanation: IMS is classified as a Network because it provides the infrastructure and functionality for delivering multimedia services over IP networks. It manages registrations, call routing, and session control, essential functions of a telecommunications network.
section_title: I.1Scope
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