What is SBP?

SBP most likely refers to Session Border Proxy. A Session Border Proxy (SBP) is a network element that sits on the border between VoIP networks, exerting control over the signaling and media streams involved in setting up, conducting, and tearing down calls. It provides security, interoperability, and control features for VoIP networks, including NAT traversal, protocol translation, and call admission control. They are commonly used by service providers to manage and secure their VoIP infrastructure, and by enterprises to connect their internal VoIP networks to the public switched telephone network (PSTN) or other VoIP networks.