VoIP 911 Server ERL Correction via LIS Interception
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Solution Overview
Problem
Current VoIP 911 services fail to accurately provide the correct physical location of emergency callers working from home, as the system presumes calls originate from the enterprise's physical address rather than the caller's home address, leading to incorrect dispatchable locations being provided to 911 operators.
Innovation Solution
The method involves intercepting the Kari's Law notification from a multi-line telephone system, using the emergency location identification number to retrieve and correct the physical address from a location information server, and reissuing the notification with the correct address to ensure accurate location information is provided to public safety during VoIP emergency calls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the VoIP system uses the enterprise's physical address for emergency calls, then the system maintains simplicity in location tracking, but the location accuracy deteriorates when employees work from home
Solution Approach 1:
The patent introduces a notification intermediary system that intercepts Kari's Law notifications from the MLTS, retrieves updated location information from the LIS using the extension number, and replaces the enterprise address with the employee's home address before routing the emergency call. This intermediary mechanism resolves the contradiction by maintaining system simplicity while achieving accurate location tracking.
2Measurement precision
If the system retrieves and corrects location information in real-time during emergency calls, then the location accuracy improves, but the response time deteriorates due to additional processing steps
Solution Approach 1:
The patent performs location information retrieval and correction as a preliminary action during the notification phase, before the actual emergency call is routed to PSAP. By intercepting and correcting the Kari's Law notification in advance, the system ensures accurate location data is ready before the emergency call proceeds, minimizing any time loss.
3Measurement precision
If the VoIP system implements notification interception and location correction, then the location accuracy improves, but the system complexity increases
Solution Approach 1:
The patent leverages existing multi-functional components in the VoIP system, particularly the LIS (Location Information Server) that already serves location retrieval functions. By extending the LIS to handle notification interception and address correction, the system achieves enhanced functionality without adding entirely new complex subsystems, thus improving location accuracy while limiting complexity increase.
Data Source
AI summary
Methods for ERL Correction are provided including receiving a VoIP emergency call from an emergency caller. The VoIP emergency call is identified by a unique ELIN. The ERL data associated with the unique ELIN is retrieved from a LIS using the unique ELIN. A notification is intercepted at the LIS. The notification contains both an original extension number or a DID number and the ERL data. The ERL data is matched using the ELIN to the ERL data to locate one of the original extension number and the DID number. A correct physical address is located using the original extension number or the DID number. Address data is corrected in the ERL to include the correct physical address of the emergency caller to provide a corrected ERL. The notification is reissued including the corrected ERL and the VoIP emergency call is routed to a PSAP with the corrected ERL.