Of course VOIP brings its own headaches. Yesterday Comcast rerouted our modem because DrFirst secure servers were not coming up. It solved the routing problem, but we lost our external IP address we had for three years. We could not use the VOIP lines because their servers only accepted packets from our old IP address. After we figured it out, took 15 minutes to re-propagate and we were up again. Other services used our DynDNS name and were correctly rerouted.
