JPH0286256U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the connection between the subscriber line and the central office line of an exchange according to an embodiment of this invention, and Fig. 2 is a block diagram showing the connection between the central office line and the central office line, which is an embodiment of this invention, from the central office line to the accommodating terminal. Figure 3 is a flowchart when setting the time limit and the upper limit on the number of shared trunk trunks used in this invention.
FIG. 4 is a diagram showing an example of time limit setting for each subscriber group according to this invention, and FIG. 5 is a block diagram showing the connection between subscriber lines and central office lines in a conventional exchange. In the figure, 1a and 1b are terminals of subscriber groups A and B, respectively, 1c is another terminal, and 2
a and 2b are subscriber circuits for subscriber groups A and B, respectively, 2c are other subscriber circuits, 3 is a switch network, 4a and 4b are dedicated central office line trunks for subscriber groups A and B, respectively, and 4c
are other central office line trunks; 4d is a central office line trunk shared by all subscribers; 5a to 5d are central office lines corresponding to the respective central office trunks; 6 is a call control processor;
Reference numeral 7 indicates a central office switchboard, and 8 indicates a measuring device for measuring call number distribution and call volume. In addition, in the figure, the same reference numerals are the same,
or a significant portion.

Claims (1)

[Scope of utility model registration request] In exchanges that accommodate multiple subscriber groups and share a common central office line,
A central office line incoming call restriction system characterized by restricting the central office line used by each subscriber group at a predetermined time.