What's the difference between a SSiQ, an INVR and a DVR?

In CSGs world we utilize SSiQ. What differentiates a SSiQ (Server Switch iQ) from a traditional server, INVR (Internal Network Video Recorder) or DVR (Digital Video Recorder) is a SSiQ has a built-in switch. The SSiQ partner we use has many additional hardening features built-in for extra security.