Application Dialer Fall-Back to Native Dialer for Emergency Calls
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Solution Overview
Problem
IP telephony technologies face challenges in supporting emergency services and uniquely identifying the physical location of a device, as they rely on IP addresses that may not directly correlate with the device's physical location, unlike traditional PSTN systems.
Innovation Solution
A mobile device with both an application dialer and a native dialer, where the application dialer passes control to the native dialer for predetermined emergency numbers, ensuring compatibility with PSTN features, while using a PPNBE-compatible application to manage calls through a wireless network, utilizing a registered IP address for routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If IP telephony application is used to originate calls, then flexibility and additional telephony features are provided, but ability to support emergency services and accurately identify physical location is lost
Solution Approach 1:
The patent introduces a mediator component that intercepts call requests from the IP telephony application and redirects emergency service calls (identified by specific number patterns like 9-1-1) to the native dialer. This intermediary mechanism allows the system to maintain the flexibility of IP telephony for general use while ensuring reliable emergency service support through the native dialer's direct PSTN connection and location tracking capabilities.
2Adaptability or versatility
If IP address is used to identify device location, then routing flexibility is improved, but direct correlation with physical location and unique device identification is lost
Solution Approach 1:
The patent segments the call handling process into two distinct pathways: one for regular calls using IP address routing through the application dialer, and another for emergency calls that bypass IP routing and use the native dialer's direct connection. This segmentation allows the system to maintain IP-based routing flexibility for general traffic while ensuring precise physical location identification for emergency services through the native dialer's PSTN integration.
Data Source
AI summary
Techniques for passing, releasing, and/or transferring control of a call origination from an application dialer to a native dialer of a mobile communication device include determining whether or not a destination telephone number indicated at a user interface of the device is included in a set of predetermined numbers, which may include a set of service numbers for, e.g., emergency services, directory assistance, community services and information, etc., and/or which may include other predetermined numbers. Call control may be released to the native dialer when the indicated, destination telephone number is included in the set. Otherwise, the call may be processed by the application dialer, and may be routed from the mobile device towards the destination telephone number by using a private packet backbone network exchange. The application dialer may be a default dialer, and a user of the device may be unaware of the native dialer.