Due to the strengthening of network standardization and the trend towards more open networks at the core layer, it is not possible for networks which integrate switching, control and services to adapt to the development of future services. Thus, it is the industry's consensus that IMS will become the future core network. However, from the current deployment perspective, IMS is fit for multi-media services which can help it to distinguish itself from other services. But IMS still faces a number of inherent problems such as handling voice, QoS, IP security, terminal match, as well as cost. Meanwhile softswitch has established its role as a bridge for IMS, especially in the mobile field, due to its proven ability in solving voice. Thus, softswitch and IMS will likely co-exist in harmony for a long time. Huawei's softswitch has been deployed on a large scale, and the company has accumulated rich experience in areas such as IP QoS, IP security and IP maintenance. Huawei intends to utilize this experience and expertise in the development of our IMS. Because softswitch is future-oriented and takes into account long-term results, it can easily migrate to the IMS network through software upgrades that protect carriers' investment and guarantee service continuity. In addition, unified user data management is an important characteristic of the future core network and also serves as an important foundation for providing a unified service experience (one customer account, one bill, one service password, etc.). Huawei's integrated HLR is a user management solution for the future converged network. Thus, IMS is not only an important way to realize FMC and ALL IP, but is also the key to the creation of a unified control layer.