A cloud native virtual network function (VNF) that supports network slicing to enable operators to spin up individual instances of the Mobile TAS and assign each instance to a network slice that is dedicated to serve a particular customer and/or meet specific use case requirements, such as capacity, performance, privacy, multi-tenancy, etc. Cloud-native, feature-rich VoLTE (IR.92) and VoWiFi (IR.51) IMS application server. RESTful APIs enabling quick implementation of future services and capabilities. SR-VCC support for seamless handovers between CS and PS access. IP-SM-GW, IMS-SSF and SCC-AS supporting O-SDS, T-SDS and T-ADS. Built-in, always-on tracing of signaling and call processing.