So my take from what I've read here and the glance I've taken at the patent, my thinking is that 822' was designed to be very broad, cover all contingencies, future infringements, creative work arounds, etc. I've heard it on here described as the 'bells and whistles' of the other two so I went in thinking that, but from my layperson's reading that's what it looked like.
I see this situation as our basic patents are clearly being infringed so the others cover it, but 822 is the icing on the cake and removes any creative outs the Cisco et al lawyers might try to concoct to weasel their way out of it.
Just my take.