Cisco PVDM3-256 Voice and Video High-Density DSP Module

The Cisco PVDM3-256 DSP Module is a high-density voice and video processing card for Cisco Integrated Services Routers (ISR G2) that enables advanced media handling within unified communications systems. It supports up to 256 voice channels for real-time processing, including voice compression, conferencing, transcoding, and media resource services—scaling VoIP capacity and enhancing media performance in enterprise networks. Installed in an internal router module slot on Cisco ISR G2 platforms, it provides codec support for multiple voice codecs (including G.711 and G.729) and other common formats. Part number PVDM3-256, with alternate part number PVDM3256, the module is designed as an internal high-density DSP resource for voice and video processing. It is commonly deployed to replace failed DSP resources or to upgrade Cisco router-based unified communications deployments, such as voice gateways, IP telephony systems, and branch office infrastructures. Common replacements include PVDM3-128, PVDM3-64, and PVDM4-256, reflecting its compatibility with Cisco’s modern DSP lineup. This module is used by network administrators, VoIP engineers, and system integrators to enable scalable VoIP services and reliable real-time media processing in enterprise telephony environments.