Related issue just started for me about 24 hours ago using OBi100 w/ Google Voice via the Simonics GVGW portal: I can hear dial tone, I can hear keytones as calls are placed, all OBi test calls are normal, and callers can hear me -- but I cannot hear anything once a call connects: not a live person, not an outgoing answering system, not a commercial service (eg, Time). Verified it's not my hardware, poked around the Forums and have seen recurrent but intermittent reports of this issue, no solution. Very frustrating!