Can anyone with a technical aptitude render an educated opinion on the quality/reliability of the Comcast Digital Voice service as compared to available alternatives? While I have a limited ability to understand communications technology, the Comcast tech who installed this Internet-based service indicated that by it's nature it will be temperamental and unreliable, much more so than their discontinued cable line service. My understanding is that Verizon is moving towards the same internet-based product and therefore isn't much different. Since copper lines are regarded as the most reliable in the event of cable and/or cell tower service disruptions, suggestions on the best way to get reliable land-line phone service are welcome. Many Thanks, Barb Dickson