Method of and system for limiting access to a group of telephone

Details Method of and system for limiting access to a group of telephone Method of and system for limiting access to a group of telephone

1982-06-29

1984-12-04

Brown, Thomas W.

179 18B, 179 18EA, H04M 338, H04M 342

Patent

active

044866267

ABSTRACT:
After a telephone switching system user has dialed sufficient digits to identify a call as extending beyond the system, the system attempts to route the call over trunks which will result in the least expense to the user. If all of these trunks are busy, the system then searches to find an idle trunk in identified groups of trunks. If an idle identified trunk is found, a warning tone is returned to the user and before the system will seize the identified trunk and complete the call, the user must signal with a predetermined code within a certain time period. In a nonpredetermined code is signaled, the call is terminated by the system.

REFERENCES:
patent: 3934095 (1975-01-01), Matthews et al.
patent: 4122308 (1978-10-01), Weinberger et al.
patent: 4139739 (1979-02-01), von Meister et al.
patent: 4163124 (1979-07-01), Jolissaint
patent: 4348554 (1982-09-01), Asmuth
patent: 4410765 (1983-10-01), Hestad et al.
"Expanding the Role of Private Switching Systems", S. E. Bush et al., Bell Laboratories Record, Oct. 1979, pp. 243-248.

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