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E911 for IP Phones and Systems
Comprehensive E911 protection requires proper configuration of and integration with all call servers, PBXs and gateways on the network.
IP telephony poses some new challenges for location identification. Users can unplug, move their phone, plug in and get dial tone on a IPT network. The key components -- ANI/ELIN and ALI/ERL -- of the E911 system are still required to process the 911 call. However, the question becomes, how can we capture the location of the user in real time as the phone moves?
There are two basic methods to achieve this:
Network Regions/IP Ranges
Layer 2/Port Level Network Discovery
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