Audiocodes Mediant 4000B (ESBC) - Redundant pair with 0 sessions (bare bones) supporting SW upgrade up to 5000 ESBC sessions

Includes a pair of M4KB chassis 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 2 DSP AMC sub modules with 2xDSPs.