Virtual private line service

Details Virtual private line service Virtual private line service

1989-10-27

1991-01-01

Dwyer, James L.

Telephonic communications

Special services

Abbreviated dialing or direct call

379219, H04M 342

Patent

active

049824210

ABSTRACT:
This invention relates to a method and apparatus for providing point-to-point line service by providing a switched communication circuit only whenever either terminal of the private line service lifts its receiver. In a departure from the prior art, and in order to ensure that no other stations can get access to the private line terminals, the service is provided by assigning both terminals to a common software defined network, and by routing the call through the software defined network using a non-dialable routing number derived from the identity of a calling station. Whenever either terminal lifts its receiver, a connection is set up within the software defined network; this prevents callers from outside the software defined network from accessing either terminal. Alternatively, an ingress switch of a public switched network can directly provide a non-dialable routing number for routing a call from a station that has gone off-hook to a predetermined destination identified in such a way that it cannot be reached by dialing a call. Advantageously, fully private line service is provided without requiring dedicated facilities.

REFERENCES:
patent: 4119805 (1978-10-01), Pratelli
patent: 4348554 (1982-09-01), Asmuth
patent: 4802199 (1989-01-01), Lange et al.
"Notes On The BOC Intra-Lata Networks-1986", Technical Reference TR-NPL-000275, Issue 1, Apr. 1986, AT&T & Bell Communications Research publication, pp. 3-11.
"Electronic Switching Systems, No. 1, Arranged With 4-Wire Features Switched Hot Lines Program", Program Specification, PD-2A151-01, Mar. 1971, Bell Telephone Laboratories, Incorporated, AT&TCo SPCS, 6 pages.
"Autovon Interface Feature", AT&T Brochure 5DS-190-100, Nov. 1987, Issue 3.00, pp. 11-26.
"Feature Document, Manual Line Service Features 2-Wire No. 1 and No.1A Electronic Switching Systems", AT&T brochure, AT&TCo SPCS, Section 231-090-173, Issue 2, Jun. 1981, pp. 1-24.

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