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Call Identification requirements A1: Universal system-visible identifier may not be directly typed/dialed by caller A2: Recognize local emergency identifiers where possible on call path A3: All entities along call path must be able to determine emergency call nature may need to delegate call to entity that has location information end system ? outbound proxy ? provider home Allow multiple intermediate translations “sos” ? sip:fire@county ? sip:agent17@town.county |