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PSTN Traditional Emergency Call Local Exchange Office Subscriber Local Exchange Office Police Fire & Ambulance Coast Guard 52 offices Approx. 900 offices 11 offices ISDN ISDN ISDN or Analog leased line *: To acquire the reporter’s address, each office has also lines for data communication with operators. Translating dialed 11x into the telephone number of the correct office that covers the area where the reporter resides Presenting reporter’s address based on caller-ID. Acquiring reporter’s caller-ID and address from the operator if the reporter called by CLIR (*) Getting emergency call to correct office Presenting and acquiring geographical location information The highest priority must be given to emergency calls Taking priority over all other calls Keeping call connection unless the office terminated the call Keeping connection Allowing offices to acquire caller-ID even if the reporter called by CLIR CLIP or acquiring caller-ID |