Telephonic communications – Call or terminal access alarm or control – At switching center
Patent
1990-02-12
1991-12-03
Dwyer, James L.
Telephonic communications
Call or terminal access alarm or control
At switching center
379197, 379133, 379221, 379 92, H04M 1510, H04M 900
Patent
active
050705253
ABSTRACT:
Methods for avoiding a call blocking feature. In a first method a list is kept for the trunks previously used to call a particular telephone number. Each time that particular telephone number is called a different trunk, not on that list, is used to place the call. The list is cleared and restarted whenever all the trunks have been used. In a second method a list is kept for trunks for which a call blocking message has been received when an attempt was made to call that telephone number. Each time that particular telephone number is called a trunk which is not on that list is used to place the call. Only non-blocked trunks are used to call a telephone number.
REFERENCES:
patent: 4797911 (1989-01-01), Szlam et al.
patent: 4894857 (1990-01-01), Szlam et al.
Crooks, Jr. James W.
Szlam Aleksander
Warner, II Charles L.
Dwyer James L.
Inventions Inc.
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