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The 3CX SBC (Session Border Controller)
The 3CX Session Border Controller (SBC) is a software service that installs in your local network to allow easy connection of IP Phones to a 3CX instance in the cloud, hosted either in your private cloud or by 3CX. The 3CX SBC combines all SIP (signaling) and RTP (media) VoIP Packets from one location and delivers them to the cloud PBX, thereby overcoming common firewall and networking issues that affect the reliability