US3576400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Call transfer circuit for phone exchange systems
Assignee: International Standard Electric Corp
•
Filing: 1968-02-09
•
Granted: 1971-04-27
•
Expires: 1988-02-09
Abstract
Abstract An arrangement is provided making it possible to transfer or forward calls received by one subscriber for reception by another subscriber. Means are provided by which the first subscriber is able to arrange to transfer or forward subsequent calls by dialing an appropriate code and also for assuring that only authorized call transfers are made. Call forwarding is achieved by changing the relationship between the directory number and equipment number in a translator by use of a control circuit.
Inventors
- 👤 Heinz Schluter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:15
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/54
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
186 words
An arrangement for providing a call forwarding circuit in telecommunication and particularly telephone exchange systems comprising a centrally controlled switching network which connects a calling subscriber to called subscriber equipment via means including a connectable data-wire, said means including connection points through which the position number, the call number and the class-of-service of the respective subscriber circuit can be derived from a central control unit by means of identification pulses and translation means, said connection points being individually associated to the subscribers and connected to the central control unit via a common information channel, means for connecting the connection points via a call transfer control unit to individual subscribers authorized for call transfers, said call transfer control unit including storage means for information dialed by the calling authorized subscriber for marking the subscriber to which incoming calls are to be transferred, whereupon in the call transfer control unit in the association between call number and position number the position number of the said authorized subscriber is changed to the position number of the subscriber to which incoming calls for the authorized subscriber are to be transferred.
Claim 2
Dependent Claim
186 words
An arrangement for providing a call forwarding circuit in telecommunication and particularly telephone exchange systems comprising a centrally controlled switching network which connects a calling subscriber to called subscriber equipment via means including a connectable data-wire, said means including connection points through which the position number, the call number and the class-of-service of the respective subscriber circuit can be derived from a central control unit by means of identification pulses and translation means, said connection points being individually associated to the subscribers and connected to the central control unit via a common information channel, means for connecting the connection points via a call transfer control unit to individual subscribers authorized for call transfers, said call transfer control unit including storage means for information dialed by the calling authorized subscriber for marking the subscriber to which incoming calls are to be transferred, whereupon in the call transfer control unit in the association between call number and position number the position number of the said authorized subscriber is changed to the position number of the subscriber to which incoming calls for the authorized subscriber are to be transferred.
Claim 3
Dependent Claim
23 words
An arrangement according to claim 1, in which seizure of the call transfer circuit control unit depends on dialing a defined code number.
Claim 4
Dependent Claim
42 words
An arrangement according to claim 1, in which in the call transfer circuit control unit the data-wire is disconnectable from a position-number translator on one hand and a call-number and class-of-service translator on the other hand, if a call transfer order exists.
Claim 5
Dependent Claim
42 words
An arrangement according to claim 3, in which the disconnection is made via a resistance, the value of which depends on the sense of current to let the identifying pulses pass from the position-number translator to the call-number translator and class-of-service translator.
Claim 6
Dependent Claim
52 words
An arrangement according to claim 4, in which if a call transfer order exists, the subscriber-individual connection point in the call-number and class-of-service translator is connectable to the common information channel via storage means in the call transfer control unit for determining the position-number and call-number of the subscriber to be called.
Claim 7
Dependent Claim
37 words
An arrangement according to claim 5, in which in systems with a plurality of control groups, control is secured via a control circuit, and only one control unit is connected to the call transfer circuit control unit.
Claim 8
Dependent Claim
64 words
An arrangement according to claim 6, in which a storage unit in the call transfer control unit is associated with each subscriber authorized to use the call transfer and that seizure of such a storage unit in the call transfer circuit control unit is in response to a pulse via the associated subscriber-individual connection point and of an identifying pulse from the central control.
Claim 9
Dependent Claim
28 words
An arrangement according to claim 7, in which, a call transfer order into the call transfer control unit is stored in the class-of-service translator for the respective subscriber.
Claim 10
Dependent Claim
39 words
An arrangement according to claim 8, in which when a connection is established by a subscriber after dialing the defined code number, the call transfer control unit is again actuated and the contents of the associated marker-store are cancelled.
Claim 11
Dependent Claim
69 words
An arrangement according to claim 9, in which initiation of a call transfer order is made at an existing connection by the defined code number, whereby the data-wire leading to the subscriber selected for the call transfer and the call transfer control unit receives an identification pulse on the central control and the position number of said subscriber is stored in storage means in the call transfer control unit.
Claim 12
Dependent Claim
26 words
An arrangement according to claim 10, in which the subscriber-individual connection points are connectable with storage means via a connector during such a call transfer order.
Claim 13
Dependent Claim
20 words
An arrangement according to claim 11, in which identification for said subscriber is applied in the call transfer control unit.
Claim 14
Dependent Claim
61 words
An arrangement according to claim 1, in which the call transfer control unit is connected to the called connection points of the subscribers, the position-number of a subscriber to be called is stored in the call transfer control unit and is forwarded to a separate multiple of the information channel, and the central control selects the identification of the calling subscriber.
Claim 15
Dependent Claim
32 words
An arrangement according to claim 13, in which in case of subscriber-individual storage means, the position-number of the subscriber (T11) is stored in the call transfer control unit in the nonoperative condition.
References Cited (Backward Citations)
US1760823A
Cited
US2274760A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |