US4685127A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for converting a No. 5 crossbar telephone switching central office to a conforming equal access central office
Assignee: Southwestern Bell Telephone Co
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Filing: 1985-10-01
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Granted: 1987-08-04
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Expires: 2005-10-01
Abstract
Abstract A method of providing equal access to a number of long distance carriers in local telephone company office containing No. 5 crossbar switching machines. Calls are intercepted between the line link frame and the originating registers. If the call is a long distance call, a serial number which resembles a conventional phone call is inserted in the calls place. The called number is stored and the appropriate carrier is determined by locating the calling party's pre-selected carrier choice in telephone company records. When the call identified by the serial number exits the switch it is automatically routed to the correct long distance carrier.
Inventors
- 👤 Arthur O. Miller
- 👤 Hollis Coleman
- 👤 Roger Atkinson
- 👤 Boyd Dorsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:44
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0004
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
115 words
A method for providing equal access to long distance telephone carriers to local telephone company customers who are served by central offices having No. 5 crossbar switching machines without affecting the functioning of said No. 5 crossbar switching machine comprising: a. intercepting the call while it is within the switching machine and determining the calling number and the called number; b. transmitting said data to a device for determining the selected long distance carrier; c. transmitting the identity of the selected long distance carrier to the switch; d. routing said call to a converter which provides the long distance carrier with call identifying information; and e. routing said call to the selected long distance carrier.
Claim 2
Independent Claim
115 words
A method for providing equal access to long distance telephone carriers to local telephone company customers who are served by central offices having No. 5 crossbar switching machines without affecting the functioning of said No. 5 crossbar switching machine comprising: a. intercepting the call while it is within the switching machine and determining the calling number and the called number; b. transmitting said data to a device for determining the selected long distance carrier; c. transmitting the identity of the selected long distance carrier to the switch; d. routing said call to a converter which provides the long distance carrier with call identifying information; and e. routing said call to the selected long distance carrier.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein said call is intercepted between the line link frame and the originating register.
Claim 4
Dependent Claim
15 words
The method of claim 2 wherein said call is intercepted by an originating register translator.
Claim 5
Dependent Claim
18 words
The method of claim 1 wherein said long distance carrier is determined through the use of a computer.
Claim 6
Dependent Claim
25 words
The method of claim 3 wherein said call is passed through said switch as a code and the called number is stored outside the switch.
Claim 7
Dependent Claim
27 words
The method of claim 1 which further comprises determining the time at which the long distance carrier line is seized and released with respect to the call.
Claim 8
Dependent Claim
25 words
The method of claim 1 wherein all of the requirements for feature D equal access are met by a No. 5 crossbar switch central office.
References Cited (Backward Citations)
US4594477A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |