Ultra-Flash CSFB to UTRAN This is important to note that in 5G NSA network, when UE physical layer passes by some interruptions due downlink or uplink link quality; in this case MeNB will trigger RLF (radio link failure) i.e. LTE will declare RLF procedures while SgNB will released all SCG bears(cause: SCGFailue). These SCG failures could be with different causes e.g SCG radio link failure(failureType t310-Expiry or randomAccessProblem or rlc-MaxNumRetx), Failure of SCG reconfiguration with sync.(failuretype scg-ChangeFailure), SCG configuration failure for RRC message on SRB3.(failuretype scg-reconfigFailure) , SCG Integrity Failure (failuretype srb3-IntegrityFailure) etc. • Network Functions Virtualization (NFV) and Software Defined Networking (SDN) are Two Pillar stone cloudification technology. Network Functions Virtualization (NFV) cloud is a data center and network built to host, deploy, and service virtual network functions (VNFs) using a cloud network. While Software Defined Networking(SDN) is a solution that provides seamless intra-datacenter connectivity for virtual and physical, workloads in a telecom cloud. It provides network automation services to VNF workloads as part of our NFVI solution. Below summarize advantage these both bring to teleco cloud. In fact these two technologies revolutionize cloudification world.