requirements_and_architecture_for_emergency_calling----Page:3
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Traditional Emergency Calling Basic 911: just route to local PSAP based on local switch no location delivery Enhanced 911: route + location delivery (90%+?) multiple PSAPs per PSTN switch multiple switches per PSAP location delivered out-of-band via caller number Phase I wireless (70%) call delivery based on cell tower and face no location delivery Phase II wireless (30%) call delivery based on geo address geo location delivery to PSAP |