Dubious at first blush, but...
It's far from clear to me that this is a "just like we've been doing, but with software" patent. Take the phone system. Originally, you DID have to wait for the other party to stop talking. Then, they create the four-wire system, so you got full duplex. In analogue. Those analogue signals got stacked into a T1, and those T1s into a T3. It was a COMPLETELY different network than the Internet, and, "hey, why don't we do here what they do there" was not something that could be whipped up over a weekend. If it could, believe me, it would have been done.
It really depends on what the details of the claim boil down to. If its, "Hey lets put some control software across, not a TCP connection, but a PAIR of UDPs", then yes. This fails "obviousness", and should never have been granted. But there is a reason that the original systems did not support full duplex, and whatever it was, that implies that there was real IP involved in implementing it. It may well be that this one is legit.