Method and system for indirectly establishing a call

• US 7,174,149 B2
• Filed: 07/14/2003
• Issued: 02/06/2007
• Est. Priority Date: 07/14/2003
• Status: Active Grant

• Current Assignee: Alcatel-Lucent USA, Inc. (Nokia Corporation)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Rollender, Douglas Harold, Chin, Mary Wonmon
• Primary Examiner(s): Cumming; William D.
• Application Number:
  US10/617,697
• Publication Number:
  US 20050014481A1
• Time in Patent Office: 1,303 Days
• Field of Search: 455/403, 455/453.1, 455/445
• US Class Current: 455/403
• 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 76/50 for emergency connections

Abstract

A call is indirectly established by triggering a call register to request a mobile switching center, associated with a mobile station, to establish a call between the mobile station and a second party.

Claims

1. A method of performing an emergency call back with a mobile station, comprising:

sending a call back request from a call register associated with a public service answering point (PSAP) switch to another call register, the call back request requesting that a mobile switching center, serving the mobile station, establish a call between the mobile station and a public service answering point (PSAP).

2. The method of claim 1, wherein the sending step sends a mobile station identifier and a routing number of the PSAP switch, associated with the PSAP, with the request.

3. The method of claim 2, prior to the sending step, further comprising:

receiving the routing number for the mobile switching center and the identifier of the mobile station with an emergency call from the mobile station.

4. The method of claim 3, further comprising:

creating a record in the call register associated with the PSAP switch if the emergency call is received.

5. The method of claim 1, wherein the sending step performed by the call register associated with the PSAP switch, which is associated with the PSAP,is in response to a signal from the PSAP switch.

6. The method of claim 5, further comprising:

accessing a routing number for a call register associated with the mobile switching center using a routing number for the mobile switching center received with the signal from the PSAP switch; and

wherein

the sending step sends the request to the call register associated with the mobile switching center using the accessed routing number.

7. The method of claim 1, wherein the call register associated with the PSAP switch, which is associated with the PSAP, sends the request to a call register associated with the mobile switching center.

8. A method of performing an emergency call back with a mobile station, comprising:

receiving, at a call register associated with a mobile switching center, a call back request from a call register associated with the PSAP switch; and

sending, in response to the call back request, a request to the mobile switching center that the mobile switching center establish a call between the mobile station and a Public Service Answering Point (PSAP).

9. The method of claim 8, further comprising:

accessing a paging identifier for the mobile station based on a mobile station identifier received with the call back request; and

wherein

the sending step send the paging identifier along with the request to the mobile switching center.

10. A public service answering point (PSAP) system, comprising:

a PSAP switch for handling emergency calls; and

a PSAP call register for routing a call back request from the PSAP switch to a mobile switching center which served an emergency call from a mobile station identified in the call back request.