Telephonic communications – Plural exchange network or interconnection – Interexchange signalling
Patent
1991-11-29
1994-04-12
Brown, Thomas W.
Telephonic communications
Plural exchange network or interconnection
Interexchange signalling
379207, 379221, 379246, H04M 710
Patent
active
053032900
ABSTRACT:
This application discloses a system for eliminating a busy line condition and completing a call over a virtual private line when the stations at each of the lines attempt to initiate a call simultaneously. The system is implemented in three phases. In a first phase, the busy line condition is detected by either the communication switching system which sets up the virtual private line or by two signal converters, each connected to a station set at each end of the line. In a second phase, the switching system or the converters send terminating supervisory signals towards each station to terminate the attempted initial calls while the stations are still off-hook. In a third phase, a predetermined signal converter or a selected switch in the communication switching system initiates a new call by emitting an originating supervisory signal while the stations are still off-hook.
REFERENCES:
patent: 3637946 (1972-01-01), Hamrick
patent: 4982421 (1991-01-01), Kirsch et al.
patent: 5046181 (1991-09-01), Higuchi et al.
Engineering and Operations in the Bell System, Second Ed. 1982-1983, Sec. 8.5.5., pp. 292-294.
Redberg David A.
Sprague David L.
AT&T Bell Laboratories
Brown Thomas W.
Freedman Barry H.
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