Here are some common EPC call flows:

Evolved Packet Core (EPC) is the framework for providing converged voice and data on a 4G LTE network. It is an all-IP architecture that separates the control and data planes to reduce latency and improve scalability. Core Network Elements

The "brain" of the control plane. it handles signaling related to mobility and security for E-UTRAN access. It is responsible for tracking and paging UEs (User Equipment) in idle mode.

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