I just got a call from a facility where I installed 100 analog phones. It's a hospital. We used 3 of the 30 port modules and a phone 8 plus ATM. They say some of the phones, a few, can make outbound calls but the ringer does not work. They were using a test phone prior to installing the actual phones that will be used so it probably is not a bad ringer in the phone or a volume switch.