EMERGENCY CALL BACK FOR SESSION INITIATION PROTOCOL SESSIONS

• US 20170251027A1
• Filed: 02/25/2016
• Published: 08/31/2017
• Est. Priority Date: 02/25/2016
• Status: Active Grant

• Current Assignee: Arlington Technologies, LLC (Dominion Harbor Enterprises, LLC)
• Original Assignee: Avaya Incorporated
• Inventors: Mendiratta, Harsh V., Chatterjee, Manish, Dhal, Purnendu
• Granted Patent: US 9,979,754 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 2101/622 Layer-2 addresses, e.g. medium access control [MAC] addresses
• CPC Class Codes: H04L 61/103 across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP]
• CPC Class Codes: H04L 61/4535 using an address exchange platform which sets up a session between two nodes, e.g. rendezvous servers, session initiation protocols [SIP] registrars or H.323 gatekeepers
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04W 36/0011 for data sessions of end-to-end connection
• CPC Class Codes: H04W 4/90 Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
• CPC Class Codes: H04W 76/18 Management of setup rejection or failure
• CPC Class Codes: H04W 76/50 for emergency connections

Abstract

An Address Resolution Protocol (ARP) process receives a first Internet Protocol (IP) address that is associated with a Media Access Control (MAC) address of a communication endpoint. A first Session Initiation Protocol (SIP) INVITE for an emergency call request is received from the communication endpoint. The ARP process receives a second IP address that is associated with the MAC address of the communication endpoint. A second SIP INVITE is received that is a request for an emergency call back. The second SIP INVITE is routed to the communication endpoint based on the second IP address associated with the MAC address of the communication endpoint to reestablish the emergency call with the communication endpoint.

Claims

1. A system comprising:

a microprocessor; and

a computer readable medium, coupled with the microprocessor and comprising microprocessor readable and executable instructions that cause the microprocessor to execute;

an Address Resolution Protocol (ARP) process that receives a first Internet Protocol (IP) address, the first IP address being associated with a Media Access Control (MAC) address of a communication endpoint, and receives a second IP address, the second IP address being associated with the MAC address of the communication endpoint; and

a Session Initiation Protocol (SIP) process that receives, from the communication endpoint, a first SIP INVITE requesting an emergency call, sends the first SIP INVITE to request the emergency call, receives a second SIP INVITE requesting an emergency call back, wherein the second SIP INVITE comprises the first IP address of the communication endpoint, and routes the second SIP INVITE to the communication endpoint based on the second IP address associated with the MAC address of the communication endpoint.

2. The system of claim 1, wherein the first IP address is from a first network and the second IP address is from a second network and wherein the first IP address is different from the second IP address.

3. The system of claim 1, wherein the SIP process associates the MAC address with the emergency call.

4. The system of claim 1, wherein the emergency call back request results from the communication endpoint moving between a first wireless network and a second wireless network, which causes a communication session for the emergency call to be disconnected prematurely.

5. The system of claim 1, wherein the second SIP INVITE is routed to the communication endpoint based on sending the first SIP INVITE to request the emergency call.

6. The system of claim 5, wherein the first SIP INVITE is sent regardless of whether a user is authenticated or not.

7. The system of claim 1, wherein the SIP process receives a SIP out-of-dialog message addressed to the communication endpoint using the first IP address and routes the SIP out-of-dialog message to the communication endpoint using the second IP address.

8. The system of claim 1, wherein the received first IP address is based on the first SIP INVITE and wherein a first ARP request is automatically sent in response to receiving the first SIP INVITE.

9. The system of claim 8, wherein the first ARP request is automatically sent, regardless of a state of an ARP table for an ARP process.

10. The system of claim 1, wherein the first SIP INVITE comprises the MAC address of the communication endpoint, wherein the second SIP INVITE comprises the MAC address of the communication endpoint, and wherein the SIP process uses the MAC address of the communication endpoint to route the SIP INVITE to the communication endpoint.

11. A method comprising:

receiving, by a processor, from an Address Resolution Protocol (ARP) process, a first Internet Protocol (IP) address that is associated with a Media Access Control (MAC) address of a communication endpoint;

receiving, by the processor, a first Session Initiation Protocol (SIP) INVITE that is an emergency call request from the communication endpoint;

sending, by the processor, the first SIP INVITE to request the emergency call;

receiving, by the processor, from the ARP process, a second IP address that is associated with the MAC address of the communication endpoint;

receiving, by the processor, a second SIP INVITE that is a request for an emergency call back, wherein the second SIP INVITE comprises the first IP address of the communication endpoint; and

routing, by the processor, the second SIP INVITE to the communication endpoint based on the second IP address associated with the MAC address of the communication endpoint.

12. The method of claim 11, wherein the SIP process associates the MAC address with the emergency call.

13. The method of claim 11, wherein the emergency call back request results from the communication endpoint moving between a first wireless network and a second wireless network, which causes a communication session for the emergency call to be disconnected prematurely.

14. The method of claim 11, wherein the second SIP INVITE is routed to the communication endpoint based on sending the first SIP INVITE to request the emergency call.

15. The method of claim 11, wherein the first ARP request is automatically sent, regardless of a state of an ARP table for an ARP process.

16. The method of claim 11, wherein the received second IP address associated with the MAC address is in an IP packet with a SIP BYE message for the emergency call.

17. The method of claim 11, wherein the received first IP address associated with the MAC address is in an IP packet with a SIP message and wherein a first ARP request is sent automatically in response to the IP packet comprising the SIP message.

18. The method of claim 11, wherein the SIP process receives a SIP out-of-dialog message addressed to the communication endpoint using the first IP address and routes the SIP out-of-dialog message to the communication endpoint using the second IP address.

19. The method of claim 11, wherein the first SIP INVITE comprises the MAC address of the communication endpoint, wherein the second SIP INVITE comprises the MAC address of the communication endpoint, and wherein the SIP process uses the MAC address of the communication endpoint to route the SIP INVITE to the communication endpoint.

20. A system comprising:

a microprocessor; and

a computer readable medium, coupled with the microprocessor and comprising microprocessor readable and executable instructions that cause the microprocessor to execute;

an Address Resolution Protocol (ARP) process that receives a first Internet Protocol (IP) address associated with a Media Access Control (MAC) address of a communication endpoint and receives a second IP address associated with the MAC address of the communication endpoint; and

a session manager that receives an emergency call request from the communication endpoint, sends the emergency call request, receives a request for an emergency call back, and routes the request for the emergency call back to the communication endpoint based on the second IP address associated with the MAC address of the communication endpoint.