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Requirements
Direct user interface, without “dialing” number
but do NOT require user to input this identifier directly
i.e., separate user interface from protocol identifier!
Reach emergency help in any country, without knowledge of local numbers
also, universally recognizable by proxies regardless of location of caller
Deployable incrementally
even if not all entities support the mechanism
Testable without impacting PSAP (human) resources
Backwards-compatible with PSTN emergency calling
PPT Version