Symantec Private Branch Exchange (PBX) is a common Symantec component that uses socket passing to reduce the number of ports required to be open across a firewall. PBX uses a paradigm similar to that of a telephone switchboard, in which calls placed to a switchboard are redirected to a known extension. In the PBX exchange, client connections that are sent to the exchange’s port are redirected to an extension associated with the Management Server. This process multiplexer runs on the Management Server and every managed host.
PBX relies on the Symantec Infrastructure Core Services Common (VRTSicsco), a package that contains runtime libraries.