Since you are talking voice and CVP you could write a non-audio CVP Studio app that you insert right at the start (just after the send to VRU) that does "something".
The "something" depends on your programming skills. It could be an INSERT into a Database you are polling, or a Web Service call, but I also reckon it could be some sort of event on a MQ Series message bus or even some totally custom Java solution. The possibilities are endless - Audium was designed that way.
Regards,
Geoff