911 and VOIP haven't always worked well together. VOIP is a virtual service, unlike standard phone lines. So the traditional 911 system, which ID's the location from where the emergency call is being dialed, doesn't automatically work with VOIP. That's why the FCC is now requiring VOIP providers to include 911 service with all plans. So when your VOIP provider asks you for the accurate physical address of your connection, make sure to give to them. The provider will use this address for 911 responses.