A session border controller (SBC) is a community gadget that sits between an IP PBX and the general public switched phone community (PSTN). It offers numerous capabilities, together with:
- Safety: The SBC acts as a firewall, defending the IP PBX from unauthorized entry.
- NAT traversal: The SBC permits the IP PBX to speak with gadgets on the PSTN, even when the IP PBX is behind a firewall or NAT gadget.
- Name routing: The SBC can route calls between the IP PBX and the PSTN, based mostly on quite a lot of standards, comparable to caller ID, dialed quantity, and time of day.
- Media transcoding: The SBC can convert media streams between completely different codecs, comparable to between G.711 and G.729.
SBCs are an integral part of any IP PBX system. They supply numerous essential capabilities that assist to make sure the safety, reliability, and efficiency of the system.