We just had the oddest thing happen which worries us as new users. We had 3 calls running on asterisk (one from sip to sip and the other to sip to zap). It seemed for no reason, the connections just dropped and the lines went dead. You couldn't call a phone (not even yourself). Once I restarted asterisk (it gracefully shutdown and started back up), then everything worked again. This concerns us because we had hoped to use VoIP in a production environment. I know it didn't overload, because we have about 45 users on it and about 400 calls a day (i've seen upwards of 9 calls at a time). Any thoughts? Rob