Patent US5325422A successfully refreshed from Google Patents.
US5325422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
PBX telephone call control system
Assignee: Avaya Inc
•
Filing: 1993-11-10
•
Granted: 1994-06-28
•
Expires: 2013-11-10
Abstract
Abstract A PBX telephone call control system is disclosed. The system provides a line interface unit connection between a plurality of subscriber line extensions and a private branch exchange (PBX) switching equipment. The call control system appears to the PBX like any other telephone extension within the office environment and provides the user with more features in conjunction with the pre-existing PBX equipment, providing expanded capabilities at a reasonable expense.
Inventors
- 👤 David J. Ladd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:02
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/38; H04M15/00; H04M15/80; H04M15/8044; H04M3/42; H04M3/42314; H04M3/50; H04M3/527; H04Q; H04Q3/00; H04Q3/58; H04Q3/62; H04Q3/625; H04M2215/00; H04M2215/42; H04M2215/74; H04M2215/745; H04M3/22; H04M3/2218; H04M3/382; H04M3/487; H04M3/493; H04M3/53; H04M3/533; H04M3/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
199 words
A method of completing plural incoming telephone calls concurrently to corresponding plural facilities of a telephone switching system using a corresponding plurality of station lines of the switching system, comprising the steps of: receiving a plurality of requests for service arising respectively from the incoming telephone calls directed toward the telephone switching system; transmitting an instructional message to the sources of the requests for service to transmit communication facilities identifying information; receiving and temporarily storing communication facilities identifying information transmitted from said sources of requests in response to said instructional message; requesting service of said telephone switching system using said station lines; receiving dial tone on the station lines from the telephone switching system and preventing the dial tone from reaching each said source of request for service; transmitting communication facilities identifying information resulting from said stored communication facilities identifying information on the station lines to the telephone switching system so that the telephone switching system can effect plural communication paths between respective communication facilities and the respective sources of the requests for service; and causing the respective sources of requests for service to be connected to respective communication paths to provide for communication to the selected communication facilities.
Claim 2
Independent Claim
199 words
A method of completing plural incoming telephone calls concurrently to corresponding plural facilities of a telephone switching system using a corresponding plurality of station lines of the switching system, comprising the steps of: receiving a plurality of requests for service arising respectively from the incoming telephone calls directed toward the telephone switching system; transmitting an instructional message to the sources of the requests for service to transmit communication facilities identifying information; receiving and temporarily storing communication facilities identifying information transmitted from said sources of requests in response to said instructional message; requesting service of said telephone switching system using said station lines; receiving dial tone on the station lines from the telephone switching system and preventing the dial tone from reaching each said source of request for service; transmitting communication facilities identifying information resulting from said stored communication facilities identifying information on the station lines to the telephone switching system so that the telephone switching system can effect plural communication paths between respective communication facilities and the respective sources of the requests for service; and causing the respective sources of requests for service to be connected to respective communication paths to provide for communication to the selected communication facilities.
References Cited (Backward Citations)
US3111561A
Cited
US3179750A
Cited
US3347988A
Cited
US3510598A
Cited
US3482057A
Cited
US3614328A
Cited
US3793487A
Cited
JPS4992908A
Cited
US3867582A
Cited
US3859473A
Cited
US4200772A
Cited
US3985971A
Cited
US3992587A
Cited
US3963875A
Cited
US3989901A
Cited
US4088838A
Cited
US4191855A
Cited
US4086438A
Cited
US4122308A
Cited
US4139739A
Cited
US4152547A
Cited
US4232199A
Cited
US4255618A
Cited
US4371752A
Cited
US4420656A
Cited
JPS5690663A
Cited
JPS5690664A
Cited
JPS56129469A
Cited
US4327251A
Cited
US4376875A
Cited
JPS5754492A
Cited
US4356351A
Cited
US4446553A
Cited
US4439635A
Cited
JPS58187056A
Cited
US4413158A
Cited
US4488005A
Cited
US4484031A
Cited
US4608640A
Cited
US4577062A
Cited
US4600814A
Cited
US4696028A
Cited
US4975941A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-06-27 | 1997-12-27 | 1998-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-27 | 2001-12-27 | 2002-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-27 | 2005-12-27 | 2006-06-28 | $7700.00 | Window Closed / Lapsed |