A Session Border Controller (SBC) is a device or software that initiates, conducts, and terminates VoIP phone calls.
SBCs can provide routing, security, interoperability, and more.
However, Sessions Border Controllers are not the only option and we find that most of our partners actually need a SIP Proxy. Read more about the difference between an SBC and a SIP Proxy here.
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What is a SIP Proxy?
3CX Session Border Controller