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The breathe of fresh VoIP are dominating the market. You can still do VoIP and have Analog Backup incase of unforseen outages. I will take 96% uptime of my VoIP with 8 hours of UPS life seeing how it is only applying -48volts to the backplane and you can run them in series to keep the system up long enough to conduct business. Keep in mind any great implementation takes a great backup plan.