Clay, which VoIP softphone do you use? We don't recommend USB redirecting a USB headset (with audio) back to the VM due to technical challenges such as:
* media hairpinning
* high bandwidth
* no QoS support
* not supported by the UC vendor
We have UC / VoIP optimized solutions that integrate with View with Avaya, Cisco, Microsoft and Mitel. These partner based solutions are completely scalable and provide rich VoIP quality by performing all the media processing on the client endpoint.