A cloud SBC is a software-based Session Border Controller solution that runs on cloud infrastructure to secure, manage, and connect voice and video traffic over IP networks. Unlike hardware-based SBCs, a cloud SBC provides the flexibility to scale resources on demand and simplifies deployment in modern environments. It plays a key role in unified communications solutions, ensuring interoperability between platforms, enforcing security policies, and maintaining call quality. Cloud SBCs are also essential for direct routing in collaboration platforms, such as Microsoft Teams, enabling secure connections between service providers, enterprise networks, and cloud communication services.