I use vonage. When the phone goes down, you can have it setup to redirect to a cell phone if you wish. Also, the features are really cool. I have mine setup so both my office phone rings and my cell phone rings at the same time. The call goes to whichever phone I answer. The voicemail emails you telling you who left you the voicemail and you can either listen to it online or on the phone. I am happy that I switched.
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