ZTE's Call Session Control Function product - ZXUN CSCF, based on an architecture where access, control, and service are separated, implements unified control for fixed and mobile users and provides basic communication services and enriched multimedia services for these users. ZXUN CSCF, as the core control node in the IMS network, handles SIP signaling messages and provides user access control, network authentication, session control, service triggering, and QoS control functions. Meanwhile, due to its highly reliable architecture and flexible deployment, ZXUN CSCF is widely used in VoLTE, WoWiFi, RCS, and Fixed-Mobile Convergence (FMC) networks to provide powerful and comprehensive control function. ZXUN CSCF can be deployed either on the standard ATCA hardware or on the general-purpose COTS hardware. It supports rich virtualization functions, including automatic deployment, elasticity, failure self-heal, intelligent O&M, etc.