Cisco Fourth-Generation 64-Channel High-Density Packet Voice Digital Signal Processor Module (Factory Upgrade from 32-Channel) - DSP-moduuli äänelle malleihin P/N: C1-CISCO4331/K9, ISR4331-AXV/K9, ISR4331-V/K9, ISR4331-V/K9-RF, ISR4331-VSEC/K9