Ann heard some clipping on her calls yesterday, so I tweaked it a bit today. Opened up port 10000 UDP inbound to the box (might be superfluous, but recommended on some Obihai setup guides). Most important tweak was the QoS settings on the router, reserving highest priority for the Obihai box. Today we were both on calls while I was flooding the pipe with speedtests, and the voice didn't clip once.