I get this behavior a lot, particularly incoming calls to my GV number on Obi202 that originate from a cell phone. Very often noise on the line triggers the GV call intercept to announce that call recording is on, but I don't hear it, I only hear static. My caller can usually still hear me for a bit. What is worst is that callers afraid of being recorded blame me for Google doing this seemingly randomly to us. I assume that when recording turns on that there is a CODEC renegotiation which fails, and thus noise on the line might trigger the recording, which then triggers the codec change and unrecoverable static with one-way audio. However it could be a codec change or static triggers all of that between the obi and GV.