Hybridized i2/i3 Routing for Legacy 911 to NG9-1-1 Migration
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Solution Overview
Problem
The transition from legacy 911 systems to Next Generation 911 (NG9-1-1) systems poses a challenge for Telecommunications Service Providers (TSPs) as they need to manage and route 911 traffic to multiple Emergency Services Intranet (ESINet) solutions and legacy Selective Routers (S/R) and Automatic Location Identification (ALI) databases, requiring efficient location-based routing and pre-routing of 911 calls.
Innovation Solution
The implementation of a hybridized i2/i3 technique that uses Location Information Service (LIS) systems, Emergency Service Landline Key (ESLK) records, and SIP PIDF-Lo objects for routing 911 calls, allowing for the gradual decommissioning of ALI databases by interacting with ESINet and legacy systems through E2 interfaces and proxy redirect servers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If TSPs connect to multiple ESINets and legacy S/R for 911 traffic delivery, then call routing flexibility and system adaptability improve, but device complexity and operational burden increase
Solution Approach 1:
The patent introduces a centralized Automatic Location Identification (ALI) database as an intermediary component that consolidates location information for multiple PSAPs. The TSP queries this single ALI database using the called party number, and the database returns the appropriate PSAP routing information. This intermediary approach allows the system to support multiple ESINets and legacy S/R connections without increasing TSP complexity, as the routing intelligence is centralized in the ALI database rather than distributed across multiple TSP configurations.
2Reliability
If legacy ALI databases are decommissioned during transition to NG9-1-1, then system modernization and long-term maintenance improve, but transition period complexity and potential service disruption increase
Solution Approach 1:
The patent implements preliminary action by maintaining the legacy ALI database operational throughout the transition period while simultaneously deploying the new NG9-1-1 ESINet infrastructure. The system is designed to query either the legacy ALI database or the new ESINet location services depending on which is available and appropriate. This gradual transition approach allows PSAPs to be migrated one at a time to the new system without requiring complete decommissioning of legacy infrastructure, thereby maintaining service continuity while managing transition complexity.
Data Source
AI summary
Disclosed are techniques for enabling an emergency call routing system. The system comprises a Voice-over Internet Protocol (VoIP) position center (VPC) server and a location information server (LIS). The VPC server may be configured to receive a session initiation protocol (SIP) INVITE for an emergency call intended for a destination public safety answering point (PSAP) from a telecommunication service provider (TSP) SIP call server. The VPC may also respond to the source of the SIP INVITE message with a SIP redirect response that includes routing data compatible with and capable of enabling the TSP SIP call server to route the emergency call to the destination PSAP. The LIS server may be configured to receive and store telephone number provisioning information from a TSP, the information including registered address data for the telephone number. The LIS may also receive and store PSAP capability data, the PSAP capability data indicative of the PSAP being i2 capable or i3 capable. For i2 capable PSAPs, the LIS may receive and respond to address requests for the telephone number that initiated the emergency call. For i3 capable PSAPs, the LIS may provide the VPC a PIDF-Lo formatted location object within the SIP redirect response.