I was unable to use my asterisk box, even for internal calls, when its DNS servers were down. Why would that be? I can understand why I wouldn’t be able to connect to a VoIP provider. But why would my local extensions/phones have dead air when I picked up the receiver? I was not able to dial out using the PSTN.
I am using Asterisk 1.2 and two analog phones plugged into a Sipura 2000.