IMS (IP Multimedia Subsystem) is a brand-new multimedia service form. It can meet the requirements for more novel and diversified multimedia services of terminal users. As a core technology of the next-generation network, IMS is also an important way to integrate mobile networks and fixed networks, and converge voice, data, and video services. ZTE's multi-network integrated IMS solution covers all the NEs defined by 3GPP, TISPAN and 3GPP2. It also provides a full range of equipment from the access layer, bearer layer, service layer and user data layer, including IMS core control equipment, user data management, application server, interconnection equipment, media resource server, policy server and O&M support system. Through an IMS network, it provides unified access control for 2G, 3G, 4G, 5G, and fixed network users, and provides abundant voice, video, and message services, facilitating the smooth evolution from the traditional network to the virtualized network and cloud native network.