US 4,907,256 A · Exchange system having originating call restriction function

Abstract

Disclosed is an exchange system having an originating call restriction function comprising a unit for counting originating calls, a unit for counting incoming calls, a storage unit for storing a number (N.sub.o) or originating calls that can be accepted from accommodated subscribers (111) within a predetermined period, storage unit for storing a number (N.sub.i) of incoming calls that can be accepted within a predetermined period, and a unit for correcting the number of calls that can be accepted. The correction of the number of calls that can be accepted is effected by comparing the number (N.sub.i) of incoming calls that can be accepted and a number (N.sub.ai) of accepted incoming calls. When the difference between the number (N.sub.i) of incoming calls that can be accepted and the number (N.sub.ai) of accepted incoming calls is decreased below a predetermined value, the number (N.sub.o) of originating calls that can be accepted is decreased by a predetermined correcting value (.alpha.), and the number (N.sub.i) of incoming calls that can be accepted is increased by the correcting value (.alpha.), Whereby, when there is processing congestion, the incoming call restriction level is relaxed and the originating call restriction level is increased. 7

Claims23

Dependent claims

An exchange system having an originating call restriction function for restricting originating calls when the number of originating calls exceeds a predetermined process restricting value within a predetermined period, comprising:

means for counting originating calls;
means for counting incoming calls;
storing means for storing a number (N.sub.o) of originating calls that can be accepted from accommodated subscribers (111) within a predetermined period;
storing means for storing a number (N.sub.i) of incoming calls that can be accepted within a predetermined period;
and
means for correcting the number of calls that can be accepted, by comparing said number (N.sub.i) of incoming calls that can be accepted with a number (N.sub.ai) of accepted incoming calls, and when the difference between said number (N.sub.i) of incoming calls that can be accepted and said number (N.sub.ai) of accepted incoming calls is decreased below a predetermined value, by decreasing said number (N.sub.o) of originating calls that can be accepted by a predetermined correcting value (.alpha.), and by increasing said number (N.sub.i) of incoming calls that can be accepted by said correcting value (.alpha.);
whereby, when there is processing congestion, the incoming call restriction level is relaxed and the originating call restriction level is increased.

4 more elements

An exchange system having an originating call restriction function in an exchange (1) for determining a number (N.sub.o) of accepted originating calls that can be originated from accommodated subscribers (111) within a predetermined period, and a number (N.sub.i) of accepted incoming calls that can be incoming within a predetermined period from another exchange (211) connected through a transmission line (211), and when a number (N.sub.ao) of originating calls called and accepted within a predetermined period from said subscribers (111) increases to more than said number (N.sub.o) of accepted originating calls that can be originated, the calls from said subscribers (111) are restricted, and when a number (N.sub.ai) of accepted incoming calls incommed within a predetermined period from said another exchange (211) increases more than said number (N.sub.i) of incoming calls that can be accepted, the calls received from said another exchange (211) are restricted;

characterized in that a call number correcting means (55) is provided whereby said number (N.sub.i) of accepted calls that can be incoming is compared with said number (N.sub.ai) of accepted incoming calls, and when the difference between said number (N.sub.i) of accepted calls that can be incoming and said number (N.sub.ai) of incoming calls is decreased below a predetermined value, said number (N.sub.o) of accepted calls allowable to be accepted is decreased by a predetermined correction call number (.alpha.), and said number (N.sub.i) of receiving calls allowable to be accepted is increased by said correction call number (.alpha.).

Dependencies are inferred from the claim text.

Exchange system having originating call restriction function

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Exchange system having originating call restriction function

Life of this patent

Abstract

Claims23