# US 8,542,611 B1 · Wireless communication system for routing emergency calls from a VoIP network

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- Number: US 8,542,611 B1
- Document ID: US8542611B1
- Status: Granted
- Kind: B1
- Application number: 12/886,180
- Filed: 2010-09-20
- Granted: 2013-09-24
- Earliest claimed: 2010-09-20
- Assignees: Sprint Communications Company L.P.
- Applicants: Eric C. English; Jay Douglas Cole; Philip Martin Kunkel; Talat Jamshidi; Wen Xue
- Inventors: Eric C. English; Jay Douglas Cole; Philip Martin Kunkel; Talat Jamshidi; Wen Xue
- Web page: https://patentgrep.com/patent/US8542611B1

## CPC

- H04W 76/50: for emergency connections
- H04L 65/1069: Session establishment or de-establishment
- H04W 4/029: Location-based management or tracking services
- H04W 4/90: Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
- H04W 4/02: Services making use of location information
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Embodiments disclosed herein provide systems and methods for providing Voice over Internet Protocol (VoIP) emergency calls via a wireless communication network. In a particular embodiment, a method provides receiving an emergency call request from a VoIP communication network initiated by a VoIP communication client operating on the VoIP communication network. The method further provides processing the emergency call request to determine a wireless device associated with the VoIP communication client. The method further provides determining a location of the wireless device and determining a public safety answering point (PSAP) based on the location of the wireless device. The method further provides establishing an emergency call between the VoIP communication client and the PSAP via the wireless communication system and the VoIP communication network based on the location of the wireless device.

## Claims

### Claim 1

A method of operating a wireless communication system comprising:
receiving an emergency call request from a Voice over Internet Protocol (VoIP) communication network initiated by a VoIP communication client operating on the VoIP communication network;
processing the emergency call request to determine a wireless device associated with the VoIP communication client;
transferring a message to the wireless device requesting confirmation that a user associated with a emergency call is in possession of the wireless communication device;
in response to receiving the confirmation that the user is in possession of the wireless device, determining a location of the wireless device and determining a public safety answering point (PSAP) based on the location of the wireless device;
if the confirmation is not received, then determining a probability that the user associated with the emergency call is in possession of the wireless device;
if the probability is above a threshold, then determining the location of the wireless device and determining the PSAP based on the location of the wireless device;
if the probability is below the threshold, then determining the PSAP based on a default location; and
establishing the emergency call between the VoIP communication client and the PSAP via the wireless communication system and the VoIP communication network.

### Claim 2 (depends on 1)

The method of claim 1 further comprising transferring a phone number for the wireless device to the PSAP.

### Claim 3 (depends on 2)

The method of claim 2 wherein the PSAP initiates a call to the phone number if the emergency call connection with the VoIP communication client is interrupted.

### Claim 4 (depends on 1)

The method of claim 1 further comprising re-establishing the emergency call between the PSAP and the wireless device if the emergency call connection with the VoIP communication client is interrupted.

### Claim 5 (depends on 1)

The method of claim 1 wherein the message is a text message.

### Claim 6 (depends on 1)

The method of claim 1 wherein the default location is a default address associated with the VoIP communication client.

### Claim 7 (depends on 1)

The method of claim 1 wherein the default location is determined based on the network address of the VoIP communication client.

### Claim 8 (depends on 1)

The method of claim 1 wherein the emergency call request is a Session Initiation Protocol (SIP) request.

### Claim 9

A communication gateway system in a wireless communication system comprising:
a communication interface configured to receive an emergency call request from a Voice over Internet Protocol (VoIP) communication network initiated by a VoIP communication client operating on the VoIP communication network;
a processing system configured to process the emergency call request to determine a wireless device associated with the VoIP communication client;
the communication interface configured to transfer a message to the associated wireless device requesting confirmation that a user associated with an emergency call is in possession of the wireless device and receive a response from the wireless device confirming that the user is in possession of the wireless communication device;
if the confirmation that the user is in possession of the wireless device is received, then the processing system is configured to determine a location of the wireless device, and determine a public safety answering point (PSAP) based on the location of the wireless device;
if the confirmation is not received, then the processing system is configured to determine a probability that the user associated with the emergency call is in possession of the wireless communication device, and if the probability is below a threshold then, the processing system is configured to determine the PSAP based on a default location; and
the communication interface further configured to establish the emergency call between the VoIP communication client and the PSAP via the wireless communication system and the VoIP communication network.

### Claim 10 (depends on 9)

The system of claim 9 wherein the communication interface is further configured to transfer a phone number for the wireless device to the PSAP.

### Claim 11 (depends on 10)

The system of claim 10 wherein the PSAP initiates a call to the phone number if the emergency call connection with the VoIP communication client is interrupted.

### Claim 12 (depends on 9)

The system of claim 9 wherein the communication interface is further configured to re-establish the emergency call between the PSAP and the wireless device if the emergency call connection with the VoIP communication client is interrupted.

### Claim 13 (depends on 9)

The system of claim 9 wherein the message is a text message.

### Claim 14 (depends on 9)

The system of claim 9 wherein the default location is a default address associated with the VoIP communication client.

### Claim 15 (depends on 9)

The system of claim 9 wherein the default location is determined based on the network address of the VoIP communication client.

### Claim 16 (depends on 9)

The system of claim 9 wherein the emergency call request is a Session Initiation Protocol (SIP) request.