VoIP with t-home internet

I had the same problem, which started the moment I switched to the TM 5G service. This happened with BOTH of the MJ devices I had in service. By chance, I found that this MJ issue was solved when I connected an old wired router--with port speed limit of 10Mbps. I have a newer wired router now, which lets me "downspeed" by port. I have them set for 10Mbps, full-duplex. I don't know why the MJs fail with ports  running faster. Or maybe it's something peculiar with TMs 5G, which is worked around by down-speeding.

I'm having a new problem now with the 2 MJs; frequeent distorted voice and little echo bits and such. This happens even if the network is stripped down, with nothing else running (e.g. no PCs, TVs, anything). I even bought an Ooma VoIP device and have similar problems with that. From what I can see, you can't do qos configurations on the 5G router. But Ooma allows for "pass through" configuration, meaning you can put it between the ISP router and the rest of your network. Ooma says that will result in the best voice quality (which makes sense), but it's still not very good. Still working on this issue...