Cisco ISR G2 voice and voice+security bundles enable unified communications through a rich signaling and media- processing infrastructure, including a variety of protocols, media interworking, signal and media security, transcoding, conferencing, and quality of service (QoS).All the unified communications bundles on Cisco 3900 series routers include the PVDM3, which has been optimized for concurrent voice and video support. The PVDM3 modules support all voice-gateway functions of earlier generations of PVDMs, and add higher density and more processing power to support emerging rich-media applications.