Read the forum guidelines
Inbound callers cannot hear us talking after we answer!
While talking to other caller suddenly cannot hear us any longer.
Outbound calls are completed but we cannot be heard.
The problem is intermittent.
I was having the same problem. I called Cox and had them reset the modem from their end. The system seems to be working now. If the problem continues, I will call them back and they will send a technician.