Automatic calling line identification arrangement

• US 3,922,498 A
• Filed: 05/01/1974
• Issued: 11/25/1975
• Est. Priority Date: 05/01/1974
• Status: Expired due to Term

• Current Assignee: AT&T, Inc.
• Original Assignee: Guy Darrell Aul, James Russell Ballard, Roger Alan Fraser
• Inventors: Aul, Guy Darrell, Ballard, James Russell, Fraser, Roger Alan
• Primary Examiner(s): Claffy, Kathleen H.
• Assistant Examiner(s): Bartz, C. T.
• Application Number:
  US05/465,770
• Time in Patent Office: 573 Days
• Field of Search: 179/17A,18FH,27DB,8.5,27DA,27E,18D
• US Class Current: 379/115.01
• CPC Class Codes: H04Q 3/00 Selecting arrangements H04Q5/00 - H04Q11/00 take precedence

Abstract

An arrangement for identifying a calling party is disclosed. A service request from a calling line causes identification circuitry to be arranged to identify the directory number of the subscriber on an individual party line or to initially identify the directory number of the ring party on any two-party line. An identifying signal applied to the calling line'"'"''"'"'s sleeve lead results in the directory number identification and the class of service of the calling line being stored in an outpulser circuit. The outpulser then conducts a two-party test on the calling line to determine whether the tip or the ring party initiated the call if the class of service indicates that the calling line is a twoparty line. A ring party determination results in the stored identification being used; a tip party determination results in the stored identification being erased and a tip party identification being conducted.

Claims

1. In a telephone system having an AMA office and a local office, said local office comprising:

a plurality of two-party lines, means operative upon a service request from either party on a two-party line for identifying the directory number of a first party on said two-party line, an outpulser, means in said outpulser responsive to said first party directory number identification for determining whether said first party or the second party on said two-party line is requesting service, means in said outpulser operative upon said determination by said determining means for outpulsing said first party directory number to said AMA office when said first party is requesting service, means operative upon said determination by said determining means for identifying the directory number of said second party when said second party is requesting service, and means in said outpulser responsive to said second party directory number identification for outpulsing said second party directory number to said AMA office.

2. The system of claim 1 wherein said outpulser further comprises:

storage means operative upon said first party directory number identification for storing the directory number of said first party and means operative upon said second party directory number identification for erasing said stored first party dIrectory number and for entering the directory number of said second party in said storage means.

3. The system of claim 1 wherein said two-party line comprises means for applying a first predetermined electrical signal to said line when said first party is requesting service and means for applying a second predetermined electrical signal to said line when said second party is requesting service;

and said determining means comprises transistor circuitry interconnected with said two-party line, said transistor circuitry being responsive to said second predetermined electrical signal on said line for activating said second party directory number identifying means.

4. In a telephone system central office, a plurality of lines including two-party lines, outpulser circuits, trunk circuits, means for connecting a calling one of said lines to a trunk circuit, means interconnected with said lines for identifying the directory number and class of service of a party on said calling line, said number being the directory number of a first party when said calling line is a two-party line, means in said connected trunk circuit for signaling said identifying means to identify the directory number and class of service of said party on said calling line, and means for connecting an outpulser circuit to said connected trunk circuit, said outpulser circuit comprising:

means responsive to said directory number identification for storing said directory number of said party on said calling line, testing means operative upon said class of service indication that said calling line is a two-party line for determining whether said first party or the second party is the calling party on said line, means operative upon the determination by said testing means that said second party is said calling party for erasing said directory number in said storage means, said signaling means being responsive to said erasure for applying a second signal to said identifying means, said identifying means being responsive to said second signal application for identifying the directory number of said second party, and means operative upon said second party directory number identification for storing said second party directory number in said storage means.

5. The system of claim 4 further comprising means for applying a first electrical signal to said line when said first party is requesting service and means for applying a second electrical signal to said line when said second party is requesting service;

and said testing means comprises transistor circuitry responsive to said second electrical signal application for activating said signaling means to apply said second signal to said identifying means.

6. In a telephone office having a calling line identification arrangement for identifying the directory number of the calling party on a two-party line:

means for identifying the directory number of either party on said two-party line, means responsive to a service request by said calling party for energizing said identifying means to identify the directory number of a first party on said line, an outpulser, means in said outpulser responsive to said first party directory number identification for storing said first party directory number, testing means in said outpulser responsive to said first party directory number identification for determining whether said first party or the second party is said calling party, means operative upon a determination by said testing means that said second party is said calling party for erasing said first party directory number in said storage means and for energizing said identifying means to identify the directory number of said second party, and means responsive to said first party directory number erasure for storing said second party directory number in said storage means.

7. In a telephone switching system having an AMA office, a local office and a trunk iNterconnecting said local office with said AMA office, said local office having two-party identification facilities comprising:

means responsive to a call originating on a two-party line in said local office for generating the directory number of a first party on said two-party line, an outpulser circuit, storage means in said outpulser circuit, means responsive to said first party directory number generation for storing said first party directory number in said storage means, means in said outpulser responsive to said storing means for determining whether said first party or the second party is the calling party on said two-party line, means responsive to said determination by said determining means for extending said first party directory number from said storage means over said trunk to said AMA office when said first party is said calling party, means responsive to said determination by said determining means for generating the directory number of said second party when said second party is said calling party, means responsive to said second party directory number generation for erasing said first party directory number in said storage means, means operative upon said first party directory number erasure for storing said second party directory number in said storage means, and means responsive to said second party directory number storage for extending said second party directory number from said storage means over said trunk to said AMA office.

8. The system of claim 7 wherein said determining means comprises:

means responsive to said first party being said calling party for applying a first unique signal to said line, means responsive to said second party being said calling party for applying a second unique signal to said line, a testing circuit, means operative upon said first unique signal application for extending said first unique signal to said testing circuit, means operative upon said second unique signal application for extending said second unique signal to said testing circuit, and said testing circuit being responsive to said extended second unique signal for activating said means for generating the directory number of said second party.

9. The method of identifying the calling party on a two-party line in a telephone system having an AMA office, a local office, and a trunk interconnecting said local office with said AMA office, said method comprising the steps of:

generating the directory number of a first party for a call originating on a two-party line in said local office, storing said first party number in a storage means of an outpulser circuit, determining whether said first party or the second party on said two-party line is the calling party, extending said first party number from said storage means over said trunk to said AMA office when the calling party is determined to be said first party, generating the directory number of said second party when the calling party is determined to be said second party, erasing the first party number from said storage means in response to said second party number generation, storing said second party number in said storage means in response to said erasure, and extending said second party number from said storage means over said trunk to said AMA office in response to said second party number storage.

10. The method of identifying the calling party on a two-party line in a telephony system having an AMA office, a local office, and a trunk interconnecting said local office with said AMA office, said method comprising the steps of:

applying a first unique signal to a two-party line when a first party on said line requests service, applying a second unique signal to said line when the second party on said line requests service, identifying the directory number of the first party when either the first or second party requests service, storing the direcTory number of the first party in storage means of an outpulser in response to the first party number identification, extending said first party directory number from said storage means over said trunk to said AMA office in response to said first unique signal application on said line, generating the directory number of said second party in response to said second unique signal application on said line, erasing the first party number in said storage means in response to the generation of the second party directory number, storing the second party directory number in said storage means in response to the said erasure, and extending the second party directory number from said storage means over said trunk to said AMA office in response to said second party directory number storage.