High-Density Packet Voice Digital Signal Processor Module for Cisco Unified Communications Name Platform Support Availability Release PVDM3-16, PVDM3-32, PVDM3-64, PVDM3-128, PVDM3-192, and PVDM3-256 Cisco 2901, 2911, 2921, 2951, 3925, 3945, 3925-E, and 3945-E Integrated Service Routers Unified Communications License on Universal Cisco IOS Software image Cisco IOS Software Release 15.0(1)M