Automatic call forwarding

• US 6,130,938 A
• Filed: 06/30/1997
• Issued: 10/10/2000
• Est. Priority Date: 07/08/1996
• Status: Expired due to Term

• Current Assignee: Mitel Networks Corporation
• Original Assignee: Zarlink Semiconductor Inc. (Microchip Technology Incorporated)
• Inventors: Erb, Paul
• Primary Examiner(s): Zele, Krista
• Assistant Examiner(s): TIEU, BENNY QUOC
• Application Number:
  US08/886,059
• Time in Patent Office: 1,198 Days
• Field of Search: 379/210, 379/211, 379/212, 379/201, 379/207, 379/219, 379/220, 379/221, 379/142
• US Class Current: 379/211.02
• CPC Class Codes: H04M 2203/2072 Schedules, e.g. personal calendars
• CPC Class Codes: H04M 3/36 Statistical metering, e.g. recording occasions when traffic exceeds capacity of trunks
• CPC Class Codes: H04M 3/436 Arrangements for screening incoming calls , i.e. evaluating the characteristics of a call before deciding whether to answer it based on the calling party profile H04M3/42059; based on location H04M3/42348; based on presence H04M3/42365; diversion H04M3/54
• CPC Class Codes: H04M 3/46 Arrangements for calling a number of substations in a predetermined sequence until an answer is obtained
• CPC Class Codes: H04M 3/54 Arrangements for diverting calls for one subscriber to another predetermined subscriber based on the calling party profile H04M3/42059; based on location H04M3/42348; based on presence H04M3/42365; to voice mail H04M3/53308
• CPC Class Codes: H04Q 2213/13054 Expert system
• CPC Class Codes: H04Q 2213/1309 Apparatus individually associated with a subscriber line, line circuits
• CPC Class Codes: H04Q 2213/13093 Personal computer, PC
• CPC Class Codes: H04Q 2213/13098 Mobile subscriber
• CPC Class Codes: H04Q 2213/13103 Memory
• CPC Class Codes: H04Q 2213/13106 Microprocessor, CPU
• CPC Class Codes: H04Q 2213/13141 Hunting for free outlet, circuit or channel
• CPC Class Codes: H04Q 2213/1316 Service observation, testing
• CPC Class Codes: H04Q 2213/13164 Traffic (registration, measurement,...)
• CPC Class Codes: H04Q 2213/13256 Call screening
• CPC Class Codes: H04Q 2213/13282 Call forward, follow-me, call diversion
• CPC Class Codes: H04Q 2213/13299 Bus
• CPC Class Codes: H04Q 2213/13335 Simulation, emulation
• CPC Class Codes: H04Q 2213/13343 Neural networks
• CPC Class Codes: H04Q 2213/13352 Self-routing networks, real-time routing
• CPC Class Codes: H04Q 2213/13374 : Paging
• CPC Class Codes: H04Q 2213/13377 : Recorded announcement
• CPC Class Codes: H04Q 2213/13405 : Dual frequency signaling, DTMF
• CPC Class Codes: H04Q 3/625 : Arrangements in the private branch exchange

Abstract

A method of forwarding calls, comprises storing a list of possible forwarding destinations for each subscriber, maintaining a behavior database for each subscriber indicating the probable location of the subscriber at any particular time, and forwarding incoming calls to the probable location determined from the behavior database. The behavior data base is dynamically updated according to the success rate of the forwarded calls.

Claims

1. A method of forwarding telephone calls, comprising storing a linked list of possible forwarding destinations for each subscriber, maintaining a behaviour database for each subscriber based on a success rate at reaching the subscriber at each destination, determining from said behaviour database for a called subscriber a target destination where the called subscriber is probably located, forwarding incoming calls for the called subscriber to said target destination, and dynamically updating said behaviour database according to the success rate of the forwarded calls.

2. A method as claimed in claim 1, wherein said behaviour database maintains a list of hits and misses for each destination at particular times and days of the week, and an incoming call is forwarded to the target destination for the called subscriber determined by analyzing said hits and misses to create a behaviour model for the called subscriber.

3. A method as claimed in claim 1, wherein a subscriber initially enters a destination list in said database, and said destination list is dynamically updated according to the success rate of the forwarded calls.

4. A method as claimed in claim 1, wherein each time a subscriber enters a call forwarding instruction, a destination number is added to a destination database, which is then dynamically updated on an on-going basis.

5. A method as claimed in claim 1, wherein said success rate is monitored in response to a subscriber-entered a code confirming an incoming call has actually been received by the called subscriber.

6. A method as claimed in claim 1, wherein the called subscriber'"'"'s identity is extracted from a database and sent with the forwarded call for display on the at the forwarding destination.

7. A system for forwarding telephone calls, comprising a memory for storing destination information for calls to be forwarded, said destination information including a destination number and success rate data therefor;

and a central processing unit for routing calls to a probable location of a called subscriber determined from said destination information, said central processing unit monitoring a success rate for forwarded calls and dynamically updating said success rate data.

8. A system as claimed in claim 7, wherein said memory also stores time data associated with said success rate data.

9. A system as claimed in claim 7, further comprising an input device for permitting subscriber entry of call destinations in said memory.

10. A system as claimed in claim 8, wherein said probable location is determined by analyzing said success rate data for the time of a call.

11. A system as claimed in claim 8, wherein said database stores the number of hits and misses for each destination in predetermined time periods, and said central processing unit calculates the best guess for a probable location of the called subscriber therefrom using a behaviour model.

12. A system as claimed in claim 7, wherein said central processing unit predicts the probable location from observed patterns in behaviour based on previous observations under similar conditions.

13. A system as claimed in claim 7, wherein said central processing unit uses sample data to develop a model of the expected behaviour and iteratively refines the model based on further observations.

14. A system as claimed in claim 7, wherein said central processing unit is responsive to an entered digit to determine whether a forwarded call has reached the called subscriber.

15. A system as claimed in claim 7, wherein said time data includes the time of day and day of the week.

16. A system as claimed in claim 7, wherein said central processor extracts the user'"'"'s name from said database and forwards it for display at the forwarding destination.

17. A system as claimed in claim 7, which is implemented in associated with a PABX.