said by dadkins 
:Agreed!
Third party VoIP use the actual HSI connection for the voice service - CDV does not.
Internet can go down, no third party VoIP is going to work - CDV most likely will!
CDV is backed up by battery - my modem is not.
No modem - no HSI - no VoIP/
CDV doesn't need modem or internet.
CDV does work in a power outage.
My choice was for the CDV as opposed to third party VoIP solution.
Yeah, CDV costs more than say AT&T CV or Vonage - it'll work though when *they* will not.
I definitely agree with that. My previous AT&T VOIP service was good, but if the internet or power died, it died with it.
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