Solutions for voice over internet protocol (VoIP) 911 location services

Patent metadata

Field	Value
Publication number	US-9544429-B2
Application number	US-201514842071-A
Country	US
Kind code	B2
Filing date	Sep 1, 2015
Priority date	Dec 19, 2003
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

An E-9-1-1 voice-over-IP (VoIP) solution is provided wherein a 911 call from a mobile VoIP device is routed directly to the correct Public Safety Answer Point (PSAP) via dedicated trunks, together with correct location information and call-back number. VoIP gateways are implemented locally, at least one per LATA, and accept VoIP packetized data inbound, and convert it to standard wireline voice calls. Calls are routed to an IP address at the VoIP gateway, which then egresses the call to a voice port at a selective router. Mid-call updating of location of a moving VoIP terminal is provided to a PSAP. The location of the VoIP is validated using HTTP based protocol by pushing location information to a VoIP location server, and comparing it against a geographic location database to confirm that a contained street address is valid.

First claim

What is claimed is:

1. A method of providing location information for a VoIP emergency communication, comprising:
attempting to obtain a current location of a wireless phone that initiated an established emergency Voice over Internet Protocol (VoIP) communication;
assigning a default Emergency Services Location Key (ESLK) to said established emergency VoIP communication; and
transmitting, from a physical location server, a Session Initiation Protocol (SIP) message including said assigned default Emergency Services Location Key (ESLK), to a VoIP switch.

2. The method of providing location information for a VoIP emergency communication according to claim 1 , wherein:
said default ESLK is based on a pre-registered address of said wireless phone.

3. The method of providing location information for a VoIP emergency communication according to claim 1 , wherein said physical location server comprises:
a physical VoIP location server.

4. The method of providing location information for a VoIP emergency communication according to claim 3 , further comprising:
removing said physical VoIP location server from a call signaling path of said emergency VoIP communication after said emergency VoIP communication has been established and before said emergency VoIP communication is terminated.

5. The method of providing location of a Voice Over Internet Protocol (VoIP) terminal according to claim 3 , wherein:
said current location of said wireless phone that initiated said established emergency VoIP communication is attempted from a public safety answering point (PSAP).

6. The method of providing location information for a VoIP emergency communication according to claim 1 , wherein said SIP message further comprises:
a default callback phone number.

7. The method of providing location information for a VoIP emergency communication according to claim 6 , wherein:
said default callback phone number is an admin number.

8. The method of providing location information for a VoIP emergency communication according to claim 6 , wherein:
said default callback phone number is an admin phone number of a service provider.

9. The method of providing location information for a VoIP emergency communication according to claim 1 , wherein said SIP message further comprises:
a phone number of an initiating VoIP handset.

10. The method of providing location information for a VoIP emergency communication according to claim 1 , wherein:
said emergency VoIP communication is an E911 call.

11. The method of providing location information for a VoIP emergency communication according to claim 1 , further comprising:
receiving a call termination event relating to said emergency VoIP communication within a SIP NOTIFY message initiated by said VoIP switch.

12. Apparatus for providing location information for a VoIP emergency communication, comprising:
means for attempting to obtain a current location of a wireless phone that initiated an established emergency Voice over Internet Protocol (VoIP) communication;
means for assigning a default Emergency Services Location Key (ESLK) to said established emergency VoIP communication; and
means for transmitting, from a physical location server, a Session Initiation Protocol (SIP) message including said assigned default Emergency Services Location Key (ESLK), to a VoIP switch.

13. The apparatus for providing location information for a VoIP emergency communication according to claim 12 , wherein:
said default ESLK is based on a pre-registered address of said wireless phone.

14. The apparatus for providing location information for a VoIP emergency communication according to claim 12 , wherein said physical location server comprises:
a physical VoIP location server.

15. The apparatus for providing location information for a VoIP emergency communication according to claim 14 , further comprising:
means for removing said physical VoIP location server from a call signaling path of said emergency VoIP communication after said emergency VoIP communication has been established and before said emergency VoIP communication is terminated.

16. The apparatus for providing location information for a VoIP emergency communication according to claim 12 , wherein said SIP message further comprises:
a default callback phone number.

17. The apparatus for providing location information for a VoIP emergency communication according to claim 12 , wherein said SIP message further comprises:
a phone number of an initiating VoIP handset.

18. The apparatus for providing location information for a VoIP emergency communication according to claim 12 , wherein:
said emergency VoIP communication is an E911 call.

19. The apparatus for providing location information for a VoIP emergency communication according to claim 12 , further comprising:
means for receiving a call termination event relating to said emergency VoIP communication within a SIP NOTIFY message initiated by said VoIP switch.

Assignees

• Telecomm Systems Inc

Inventors

• Zhu Yinjun
• Dickinson Richard
• Marshall Roger
• Helme Steven P

Classifications

• H04L61/106

  across networks, e.g. mapping telephone numbers to data network addresses · CPC title

• H04M7/0075

  Details of addressing, directories or routing tables · CPC title

• H04W4/029

  Location-based management or tracking services · CPC title

• H04W40/02

  Communication route or path selection, e.g. power-based or shortest path routing · CPC title

• H04W80/04

  Network layer protocols, e.g. mobile IP [Internet Protocol] · CPC title