Wishlist Quick view CISCO Cisco PVDM4-256 Fourth-Generation 256-Channel High-Density DSP Module $4,672.97 $3,178.89 CISCO PVDM4-256 FOURTH-GENERATION 256-CHANNEL HIGH-DENSITY PACKET VOICE DIGITAL SIGNAL PROCESSOR MODULE VOICE DSP MODULE. REFURBISHED. IN STOCK. Compare Add to Cart Add to Wishlist