Methods and apparatus for transmitting accurate emergency location identification numbers (ELINs) from behind a multi-line telephone system (MLTS) after an emergency caller disconnects

US6724860B2 · kind B2 · utility

Assignee

• Siemens Information and Communication Networks, Inc. · US

Inventors

• Peggy M. Stumer · Boca Raton, US
• Nissim Ozery · Coral Springs, US
• Jorge Waimin Siu · Miami, US
• Heinz Schmitt · Boca Raton, US

Key dates

• Filing date: Mar 23, 2001
• Grant date: Apr 20, 2004
• Expiry date: Aug 30, 2021

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04M2242/22
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

The invention is directed to methods for accurate transmission of ELIN/callback number from an emergency caller calling from behind a PBX/MLTS include assigning a port equipment number to each device/trunk of the PBX/MLTS and associating ports/devices with ELINs and callback numbers. The apparatus of the invention detects an emergency number, assigns the call priority, and uses the port/device number to determine the ELIN/callback number and properly transmit the ELIN/callback number optionally first over a private network and to the public network PSAP.