Thanks XTJ....based my position in the network engineering while I was working for Q...I had not seen any reference to its utilization as of 2011 in enterprise designs that I was involved in. I am not sure about vonage or skype but based on my experience with their product during that time frame I doubt they did too.
Bingo florida....Again, I am very surprised that companies such as skype or vonage do not have this IP filed long time ago....This is foundational to their business. Other face to face apps that also utilize this are apples/androids face time. Real time video conference also must use this technic consistently to adjust for voice quality along with the video codec.