US 9137634

Patent Overview: US9137634B1

Title: Method and system for obtaining emergency caller location

Patent number: US9137634B1
Application number: US14/226,832
Filing date: 2014-03-27
Publication/grant date: 2015-09-15
Priority date (as listed; noted as an assumption): 2005-07-14
Anticipated expiration (per source): 2025-07-14
Status (per source): Expired – Fee Related
Inventors: Chi Fai Ho; Shin Cheung Simon Chiu
Original Assignee: TP Lab Inc (source lists further reassignments; not analyzed here)
Source: https://patents.google.com/patent/[US9137634](/patent/US9137634)/en

Purpose: The patent addresses locating a caller during a telephone call, particularly emergency calls. The background explains that traditional residential telephone service maps a subscription's telephone number to a fixed street address in an Automatic Location identity (ALI) database, which a 911 selective router and Public Safety Answering Point (PSAP) use to dispatch services. With VoIP, an IP telephone can be moved—home, a neighbor's gateway, or a hotel network—so the registered subscription address may not reflect the caller's actual location, risking misdirected emergency response.

Plain-language scope: Embodiments described include systems and methods for obtaining a caller's location during a telephone call. A phone system obtains the subscriber access line identity of a subscriber access line and sends it to a subscriber location query system, which returns a subscriber location or subscriber location record. Subscriber phone equipment (or phone) can store a subscriber access line identity, and that stored identity can be used to retrieve the subscriber location record with the corresponding subscriber access line identity.

What the excerpt does not establish: It does not provide the full claims, complete description, or drawings; does not enumerate specific prior-art references; and does not establish the legal status, enforceability, or accuracy of the listed dates, assignees, or expiration. The priority date, legal status, and assignee listings are expressly flagged in the source as assumptions. Litigation, ownership transfers, validity, and prior art are outside this overview.