The Perimeta Session Border Controller (SBC) by Alianza is a cloud-native, software-only SBC designed to provide secure, scalable, and flexible solutions for voice and multimedia communications. It supports various deployment scenarios, including VoLTE, VoNR, SIP trunking, and Microsoft Teams direct routing, making it suitable for fixed-line, wireless, and enterprise access and interconnect environments. Perimeta operates on a zero-trust security model, ensuring robust protection for cloud infrastructure. Its unique media and signaling plane separation allows for granular scaling to meet changing demands. The SBC features a secure distribution engine (SDE) for load balancing and distributed admission control (DAM), simplifying massively scalable deployments. It is compatible with public, private, and hybrid cloud environments and can be deployed on platforms such as AWS, Azure, OpenStack, VMware, and ATCA hardware.