Optionally available for CompletePBX IP-PBX Series of all-in-one appliances, CompleteSBC™ software provides security via intrusion prevention, acting as firewall for access control and Denial of Service. Program provides NAT traversal, smart routing, and messages repair to solve interoperability problems. As B2BUA server, CompleteSBC allows implementation of additional applications such as SIP UDP/TCP/TLS gateway.