Internet protocol (IP) emergency connections (ITEC) telephony

US6678357B2 · kind B2 · utility

Assignee

• Siemens Information and Communication Networks, Inc. · US

Inventors

• Peggy M. Stumer · Boca Raton, US
• Robert Stampfl · Hohenkammer, DE
• Alfons Fartmann · Unterschleißheim, DE
• Walter Hipfinger · Wien, AT

Key dates

• Filing date: Sep 26, 2001
• Grant date: Jan 13, 2004
• Expiry date: Apr 28, 2022

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04M2242/04
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

An IP Telephony Emergency Connections (ITEC) system and method that determines the precise origin of an emergency call and routes the call to the proper Public Service Answering Point (PSAP). A source-based routing mechanism is provided in an IP telephony type network, such as a VoIP or IP over LAN/ATM. Emergency calls are routed to the correct PSAP jurisdiction. Each server/switch may include the mechanism such that the IP Telephony network can identify an E911 connection and egress to a public network at a point closest to the emergency call point of origin. Whenever an emergency number call is made, the call's origin is determined during call setup establishment. Every port or end user jack in the network is assigned a Source Group Index (SGI), which is a number or index representing each PSAP jurisdiction in the network. All ports/jacks within the same PSAP jurisdiction are assigned the same SGI. Users may be in different areas of multiple PSAP jurisdictions.