HP 0231A64P - MSR50 multi-service module assembly - Has module slots for security and voice service processing - Includes four VPM module slots, one VCPM module slot, and two ECM module slots Retail
HP 0231A85D - MSR50 G2 multi-service module assembly - Has module slots for security and voice service processing - Includes one VCPM module slot, and two ECM module slots Retail