I have a CD140 and CD145 that up until today were working fine. This afternoon I dial out and all I can hear is static, I don't even hear it ring. Same thing happens when I have incoming calls, I pick up and there is just no one there. The callers say they can hear me but I can't hear them. I've checked my internet set up, all the cables but everything seems normal. I've thoroughly studied the manual but I can find no explanation for what is happening. Can anyone help?