VoIP Emergency Call Routing via Remote ISP Segmentation
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Solution Overview
Problem
Existing systems for handling VoIP emergency calls struggle to accurately route E 9-1-1 calls from remote users, as they appear to originate from the user's home location instead of their current location, leading to incorrect PSAP routing.
Innovation Solution
A method and system that register Customer Premises Equipment (CPE) with a home Internet Service Provider (ISP) through a remote ISP, determine the remote location, obtain a local IP address for the Public Safety Answering Point (PSAP), and route non-emergency calls to the home ISP while handling emergency calls locally using the obtained local IP address.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If VoIP emergency calls are routed through the home ISP, then call processing consistency is maintained, but location accuracy deteriorates causing calls to reach incorrect PSAPs
Solution Approach 1:
The patent segments the call handling process into two distinct paths: regular calls continue to be processed through the home ISP maintaining consistency, while emergency calls are intercepted and processed locally at the remote ISP. This segmentation allows each path to be optimized for its specific requirements without compromising the other.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of call type identification and local routing logic at the remote ISP. This intermediary detects emergency calls and redirects them to the appropriate local PSAP while allowing regular calls to proceed to the home ISP, thus resolving the contradiction between consistency and location accuracy.
2Measurement precision
If emergency calls are handled locally at the remote ISP, then location accuracy improves, but system complexity increases
Solution Approach 1:
The patent applies local quality by enabling the remote ISP to perform specific emergency call handling functions locally without requiring changes to the entire network architecture. Each remote ISP is equipped with the capability to identify and route emergency calls locally, while maintaining the existing home ISP processing for regular calls.
Solution Approach 2:
The patent implements preliminary action by pre-configuring remote ISPs with the ability to identify emergency calls and determine local PSAP routing before calls are forwarded. This preliminary setup includes establishing local PSAP directory numbers and configuring routing logic in advance, reducing the complexity of real-time decision-making.
3Ease of operation
If remote users maintain home location appearance, then network management simplifies, but emergency response effectiveness deteriorates
Solution Approach 1:
The patent introduces dynamics by making the call routing behavior adaptive based on call type. The system dynamically determines whether to route calls to the home ISP or handle them locally at the remote ISP based on whether the call is identified as an emergency call, thus optimizing both network management and emergency response effectiveness.
Solution Approach 2:
The patent changes the routing parameter based on call characteristics. By identifying emergency calls through specific parameters (such as dialed number patterns or call metadata), the system alters the routing destination from the home ISP to the local PSAP, ensuring effective emergency response while maintaining simplified network management for regular calls.
Data Source
AI summary
A method for routing emergency calls is provided for emergency calls placed over a packet-switched network (310) from a Customer Premises Equipment (CPE) (110) at a remote location (100). The method includes: registering the CPE (110) with a home Internet Service Provider (ISP) (260) through a remote ISP (130) that is providing the CPE (110) access to the packet-switched network (310); determining that the CPE is at a remote location (100); obtaining a local Internet Protocol (IP) address that corresponds to a Public Safety Answering Point (PSAP) (170) serving the remote location (100); routing non-emergency calls to the home ISP (260) for call processing; and, handling emergency calls locally at the remote ISP (130) in accordance with the obtained local IP address.