My setup is Modem-Router-Ooma. Some of my calls are fine, and some are garbled or choppy. So far I have: configured QoS on my router (Netgear Nighthawk) to give Ooma highest priority; assigned Ooma a static IP; set up forwarding for the recommended ports on my router; and relocated my modem, router, and Telo.
I'm using DECT 6.0 phones. Any other thoughts on things I can do? This is awful.