Method of providing 911 service to a private branch exchange

• US 7,974,389 B2
• Filed: 10/14/2008
• Issued: 07/05/2011
• Est. Priority Date: 08/21/2000
• Status: Expired due to Fees

• Current Assignee: Ameritech Corp. (AT&T, Inc.)
• Original Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Inventors: Savaglio, John Joseph, Fowler, Richard Bruce
• Primary Examiner(s): Woo, Stella L
• Application Number:
  US12/251,238
• Publication Number:
  US 20090034691A1
• Time in Patent Office: 994 Days
• Field of Search: 379/45, 379 37- 40
• US Class Current: 379/45
• CPC Class Codes: H04M 2207/12 intelligent networks
• CPC Class Codes: H04M 2242/04 for emergency applications
• CPC Class Codes: H04M 2242/14 with services dependent on location where the service is an information service H04M2242/15; services independent of location H04M3/42229
• CPC Class Codes: H04M 2242/22 Automatic class or number identification arrangements
• CPC Class Codes: H04M 2242/30 Determination of the location of a subscriber
• CPC Class Codes: H04M 3/42042 Notifying the called party of information on the calling party details within substation equipment H04M1/57, signalling details H04Q3/72
• CPC Class Codes: H04M 3/42059 Making use of the calling party identifier
• CPC Class Codes: H04M 3/42314 in private branch exchanges
• CPC Class Codes: H04M 3/51 Centralised call answering arrangements requiring operator intervention , e.g. call or contact centers for telemarketing
• CPC Class Codes: H04M 3/5116 for emergency applications
• CPC Class Codes: H04M 7/009 in systems involving PBX or KTS networks

Abstract

A method of providing 911 service to a private branch exchange, includes grouping a plurality of private telephone numbers into a set. An outgoing telephone line for a 911 call is assigned to the set. A location information for the outgoing telephone line is input into a location database.

Claims

1. A method of providing emergency service to a private branch exchange, comprising:

determining a first geographic location of a first telephone associated with a first internal telephone line coupled to the private branch exchange;

determining a second geographic location of a second telephone associated with a second internal telephone line coupled to the private branch exchange;

when the first geographic location and the second geographic location are substantially similar, grouping the first and second internal telephone lines to form a set; and

assigning an outgoing telephone line for an emergency call to the set.

2. A method as defined in claim 1, further comprising entering the first and second geographic locations into a location information database.

3. A method as defined in claim 2, further comprising receiving the emergency call at the private branch exchange;

and sending a location query to the location database.

4. A method as defined in claim 1, further comprising placing the emergency call received from the first telephone on the outgoing telephone line to indicate the first geographic location of the first telephone.

5. A method as defined in claim 1, further comprising when the emergency call is triggered on at a service switching point, sending a query to a switching control point.

6. A method as defined in claim 5, further comprising receiving a routing instruction from the switching control point.

7. A method as defined in claim 6, further comprising routing the emergency call to a public safety answering point.

8. A method as defined in claim 1, wherein an identity of the outgoing telephone line is inherently indicative of the first and second locations.

9. A method of providing emergency service to a private branch exchange, comprising:

grouping a plurality of internal telephones coupled to the private branch exchange into a plurality of groups based on a geographic location of the respective internal telephones;

respectively assigning outgoing telephone lines to the groups, the outgoing telephone lines to be used for emergency calls; and

when an emergency call is received from a first one of the internal telephones, inherently determining at the private branch exchange the location of the first one of the internal telephones by looking up the outgoing telephone line associated with the first one of the internal telephones with a logic circuit.

10. A method as defined in claim 9, further comprising routing the emergency call to a public safety answering point.

11. A method as defined in claim 10, the public safety answering point including a location database containing information associated with the location of the respective internal telephones.

12. A method as defined in claim 11, further comprising communicating the location of the first one of the internal telephones from the location database to an operator at a public safety answering point.

13. A method as defined in claim 9, further comprising placing the emergency call over the outgoing telephone assigned to the first one of the internal telephones making the emergency call.

14. A method of providing emergency service to a private branch exchange, comprising:

assigning a first one of a plurality of outgoing telephone lines to a first set of internal telephone lines, the internal telephone lines being grouped based on physical location information associated with the internal telephone lines;

recording the physical location information in a location database;

receiving an emergency call at the private branch exchange coupled to the outgoing telephone lines;

when the emergency call originated at one of the internal telephone lines of the first set, causing an apparatus to place the emergency call over the first one of the plurality of outgoing telephone lines;

receiving the emergency call at a public safety answering point; and

determining a physical location of a telephone placing the emergency call based on an identity of the first one of the plurality of outgoing telephone lines.

15. A method as defined in claim 14, further comprising forwarding the emergency call to an operator.

16. A method as defined in claim 14, further comprising transmitting the physical location to an operator.

17. A method as defined in claim 14, further comprising assigning a second one of a plurality of outgoing telephone lines to a second set of internal telephone lines.

18. A method as defined in claim 17, further comprising placing the emergency call over the second one of the plurality of outgoing telephone lines when the emergency call originated at one of the internal telephone lines of the second set.

19. A tangible machine accessible medium having instructions stored thereon that, when executed, cause a machine to at least:

group a plurality of internal telephones coupled to a private branch exchange into a plurality of groups based on a geographic location of the respective internal telephones;

respectively assign outgoing telephone lines to the groups, the outgoing telephone lines to be used for emergency calls; and

when an emergency call is received from a first one of the internal telephones, inherently determine at the private branch exchange the location of the first one of the internal telephones by looking up the outgoing telephone line associated with the first one of the internal telephones.

20. A tangible machine accessible medium as defined in claim 19 further comprising instructions stored thereon that, when executed, cause the machine to route the emergency call to a public safety answering point including a location database storing information associated with the location of the respective internal telephones.