What Are Some disadvantages of VoIP?

What Are Some disadvantages of VoIP? If you're considering replacing your traditional telephone service with VoIP, there are some possible differences:
Some VoIP services don't work during power outages and the service provider may not offer backup power.
Not all VoIP services connect directly to emergency services through 9-1-1. For additional information, see http://www.voip911.gov/.
VoIP providers may or may not offer directory assistance/white page listings.

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