IP Phone Emergency Location Validation via ALI Database
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Solution Overview
Problem
IP phones, which can be easily moved and registered in different locations, pose challenges for determining their physical location during emergency calls, as they can be assigned numbers unrelated to their actual location, and multiple IP phones can share the same number, making it difficult for emergency services to pinpoint their location.
Innovation Solution
A system that includes an IP device, a personal computer, a local service provider footprint, a service provider domain, and an E911 Service Bureau, which uses a position server, location server, and ALI database to determine the location of IP devices by querying their registered number and updating location information, enabling accurate routing of emergency calls through selective routers and PSAPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If IP phones are allowed to be easily moved and registered in different locations, then the adaptability and versatility of the communication system is improved, but the ability to determine the physical location of the IP phone deteriorates
Solution Approach 1:
The patent introduces an ALI database as an intermediary component that stores the mapping relationship between telephone numbers and physical locations. When an IP phone registers or makes an emergency call, the system queries the ALI database using the telephone number to retrieve the current registered physical location, thus resolving the contradiction between mobility and location determination accuracy.
2Device complexity
If multiple IP phones are registered to the same traditional telephone number, then the device complexity is reduced, but the difficulty of detecting and measuring the location of each IP phone increases
Solution Approach 1:
The ALI database serves as a mediator that handles the many-to-one mapping of multiple IP phones to a single telephone number. By storing the current registered location information in the database, the system can retrieve the location of any IP phone using the shared telephone number, eliminating the need for multiple numbers while maintaining location traceability.
3Adaptability or versatility
If an IP phone is assigned a traditional telephone number unrelated to its actual location, then the adaptability of the numbering system is improved, but the reliability of location-based emergency services deteriorates
Solution Approach 1:
The system performs preliminary registration actions where the IP phone's physical location is recorded in the ALI database before emergency calls are made. This preliminary location registration ensures that when an emergency call is placed using any traditional telephone number, the system can retrieve the correct current location from the database, thereby maintaining emergency service reliability despite numbering flexibility.
Data Source
AI summary
An apparatus for providing emergency service validation may include a processor. The processor may be configured to receiving a message associated with a registration event of a device to a communication session. The message may include a parameter having information indicative of a location of the device at a time of the registration. The processor may also be configured to determine whether the location of the device at the time of the registration corresponds to a location where an emergency service dispatch is supportable.