The Session Initiation Protocol (SIP) trunking providers, users in remote branch offices, home workers/remote workers, and unified communications as a service (UCaaS) providers all have secure voice and video connectivity provided by Enterprise Session Border Controller (E-SBCs), which are located at the edge of the enterprise network. Session border controller is a combination of the following terms: A real-time communication connection between endpoints or users is referred to as a session, which comes from the Session Initiation Protocol. Usually, a voice or video call is included here. The term "border" describes the boundary between networks that do not fully trust one another. The term "controller" describes the E-capacity Session Border Controller to manage (permit, refuse, transform, and terminate) each session that crosses the border.
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