Inspired by this post over at the 3G4G wireless blog on VoLGA and VoLTE architecture differences, I reflected a bit on why it has become a bit silent around LTE voice recently. From a VoLGA point of view, maybe it is because there is little more it can prove until the time real LTE mobile devices (not USB sticks) come to the market.
Back in February 2010, VoLGA was demonstrated at the Mobile World Congress in Barcelona as fully functional, using live network equipment. It's here and it's working but until real devices become available, there is nothing more to be shown that could go beyond it. And with closely related UMA (Unlicensed Mobile Access) stacks used in practice today on Nokia, RIM and Samsung devices for Voice over Wi-Fi, I have little doubt that this final piece can be implemented very quickly. Same thing for VoLTE and CS Fallback, they are there on paper and are waiting for devices they can be implemented on.
But once the solutions can be demonstrated in practice, I expect that the competition between them will accelerate again. It's going to be interesting to see if the simplicity, full functionality from day one, fast call setup times and a relatively simple but hyper-important in-call handover from LTE to GSM / UMTS of VoLGA will trump over other solutions.