Redundant pair of Mediant 2600 Session Border Controller - with 0 SBC sessions (bare bones) and 0 transcoding sessions supporting software upgrade up to 600 redundant SBC sessions and up to 375 transcoding sessions or 600 transcoding session with addition of MPM4B. See release-notes for transcoding capacity per coder. Includes a pair of Mediant 2600 chassis each with dual power supply, AMC module with 1 CPU AMC sub module, 2 networking AMC sub modules with 4 x redundant 1000Base-T GE copper interface and a DSP AMC sub modules with 2xDSPs.