METHODS AND APPARATUS FOR TRANSMITTING OVER A PRIVATE NETWORK ACCURATE EMERGENCY LOCATION IDENTIFICATION NUMBERS (ELINS) FROM BEHIND A MULTI-LINE TELEPHONE SYSTEM (MLTS) UTILIZING PORT EQUIPMENT NUMBERS
US6744857B2 · kind B2 · utility
16Cited by
14References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 23, 2001 |
| Grant date | Jun 1, 2004 |
| Priority date | — |
| Expiry date | Jun 13, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M2242/22
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
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 over a private network for far-end hop-off to the public network PSAP.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.