JP2539881B2 - Trunk catching system in private branch exchange - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A private branch exchange capable of charging call-by-call for making a call to an external line trunk, and is basically based on a charge for a subscriber telephone line of a public telephone exchange connected to an external line trunk of the private branch exchange. Concerning the trunk capture method of the private branch exchange in the case of the same frequency, the trunk of the private branch exchange that selects and connects the optimum external trunk based on the frequency information of each external trunk every time there is a call to the external trunk In a private branch exchange equipped with a plurality of external trunks, each of which is connected to the subscriber telephone line of a system in which the usage fee of the subscriber telephone line of the public telephone exchange is fixed up to the basic divisor for the purpose of providing a capture system. In the trunk capture method, the frequency information up to that point is accumulated for each trunk to be billed in the control device of the exchange. Equipped with a frequency storage unit,
The minimum frequency trunk detection unit checks the above-mentioned frequency storage unit from the unused external line trunks, detects the external line trunk whose usage frequency is less than the basic frequency and has the lowest frequency, and detects the detected external line trunk and calling telephone. Is connected under the control of the connection control unit, and after the call is completed, the frequency calculation unit calculates the frequency for the call and updates the contents of the frequency storage unit.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a private branch exchange capable of charging call-by-call for making a call to an external line trunk, and a usage fee for a subscriber telephone line of a public telephone exchange connected to an external line trunk of the private branch exchange is reduced. The present invention relates to a trunk capturing method of a private branch exchange when they are the same within a basic frequency.

The private branch exchange is provided with a trunk connected to an external line (station line) connected to a public telephone exchange, and is connected to the trunk by dialing a special number (usually the number 0) from the local telephone, and then the other party's telephone. The connection is made by dialing the number. In that case, the line connected to each trunk is charged a usage fee (call fee) by the public telephone exchange according to the call frequency. As the line usage charge (or call charge), in Japan, a charge (frequency x unit charge) proportional to the call frequency is conventionally charged (the basic charge is charged separately). However, recently, it has been proposed to charge by another charge system, and in that method, the line charge (call charge) is the same charge up to a certain frequency, and the higher charge is proportional to the frequency. It is a method of imposing a fee.

In such a tariff system, it is uneconomical to use an outside line (station line) as in the case of making a call from a private branch exchange that accommodates a large number of public telephone lines, and it is possible to make an effective connection. Is desired.

[Prior Art] A conventional configuration diagram is shown in FIG.

The private branch exchange 40 shown in FIG. 4 accommodates a plurality of extension telephones 41 to 43 and further connects to a public exchange 46 as an external trunk.
44, 45 ...
To connect to the outside line from 41, use the special number (0) from the telephone 41
Dial. As a result, for example, a vacant outside line trunk 44 is captured, and a dial tone is sent from the dial register trunk of the public exchange 46. After this, dial the other party's telephone number to connect to the other party in the city or outside the city.
Conventionally, a trunk 4 housed in such a private branch exchange 40
Each telephone line 47, 48 connected to 4, 45 is added with the number of calls depending on the line each time a call is made from the private branch exchange (call-by-call), and a monthly fee is charged according to the number of calls. The user of the private branch exchange 40 has been billed.

However, recently, the number of operators of public lines is increasing, and it is considered that the system of the usage fee of the subscriber telephone lines accommodated in the public exchange is different from the conventional system. inside that,
The frequency is calculated for each call based on distance and time, and if the call frequency for a certain period (one month) is less than a certain frequency (called basic frequency), the same charge will be applied, and for the amount exceeding that, a charge proportional to the call will be applied. A method of adding is considered. This is a kind of basic charge because it costs even if the frequency is less than a certain frequency. A diagram for explaining the new line usage fee is shown in FIG.

As shown in FIG. 5, when the call frequency is K or less, a fixed basic charge is imposed, and when the call frequency exceeds K, a charge proportional to the frequency is added.

[Problems to be Solved by the Invention] According to the conventional configuration shown in FIG. 4, each of the outside lines 44, 45, ...
Checking for vacancy, the first available outside line is captured and the telephone connection to the city or the outside of the city is executed, so if you capture the trunk in a younger order (younger number) of the outside line, The younger the trunk usage rate within a certain period of time, the higher. Then, as shown in FIG. 5, as for the call frequency of the outside line trunk (subscription line of the public line), the younger trunk reaches the basic frequency K, and the other trunks are not yet in the basic frequency K. Occurs. Even if the private branch exchange changes to randomly pick up the trunk of the outside line, some of them will reach the basic power and some will not.

In that case, if you capture a trunk that has reached the basic frequency,
The frequency is newly added and the charge is added to the basic charge in proportion to the new frequency. However, in the case of other external trunks, it is clear that it is more economical to connect to the public exchange through the trunk because the basic power has not been reached yet. In this way, if the outside trunk is captured in the private branch exchange by the conventional method, the cost for each line becomes uneven, and the usage fee of a part of the outside trunk is increased, which causes a problem in the operation of the private branch exchange. The present invention
An object of the present invention is to provide a trunk capturing method in a private branch exchange in which an optimum external line trunk is selected and connected based on frequency information of each external line trunk every time there is a call to the external line trunk.

[Means for Solving the Problems] FIG. 1 is a block diagram showing the principle of the present invention.

10 is a network of exchanges, 11 is a control device of exchanges,
12 is a line state holding unit, 13 is a connection control unit, 14 is a minimum frequency trunk detection unit, 15 is a frequency storage unit, 16 is a frequency calculation unit, 17,
Reference numeral 18 represents an outside line trunk, and 19 represents an outgoing register trunk.

Each of the outside line trunks 17 and 18 is connected by a telephone line housed in a public exchange (not shown), and if the usage charge of each line is less than or equal to the basic frequency (K), the same charge is applied.
If the frequency exceeds it, the unit price will be added to the exceeded frequency.

The frequency memory 15 stores the current frequency of each outside trunk (cleared at regular intervals), and the frequency for each call is added each time.

According to the present invention, the control device is provided with a frequency storage unit in which the frequencies of the respective outside line trunks are individually stored. The trunk with the lowest frequency is detected, the calling telephone is connected to the trunk to make a call, the call frequency is calculated at the end of the call, and the content of the frequency storage unit is updated.

[Operation] When a call is made from the telephone A of the exchange, the call is connected to the call register trunk 19 and the dial information from the call originating telephone A is received. When the connection control unit 13 of the control device 11 identifies that the received dial is a special number (0 dial), the minimum frequency trunk detection unit 14 is activated and the detection operation is started.

The minimum frequency trunk is detected by checking the information indicating the line vacancy status of the line status holding unit 12 for the first (youngest) trunk of the outside line trunk, and if it is vacant, the frequency stored in the frequency storage unit 15 is checked. The frequency (or call charge) of the trunk is read to determine whether it is less than the basic frequency K.

If it is smaller than K, the numerical value and the trunk information are held and the next trunk is similarly judged. If it is equal to or larger than K, the detection operation for the trunk is not performed and the next trunk is examined. When a frequency lower than K is detected and held in the lowest frequency trunk detection unit 14, when it is determined that the power of the trunk thereafter is lower than K, the new frequency and the frequency previously held are determined. If the new frequency is smaller by comparison, the frequency and trunk information are retained and the previously retained content is cleared.

When the detection operation is performed for all the outside line trunks in this manner, the lowest frequency trunk detection unit 14 finally obtains the lowest frequency trunk information, and this detection information is sent to the connection control unit 13
, The connection control unit 13 performs connection control based on the trunk information detected as the calling telephone A and forms a connection path between the two on the network 10.

When the connection path is formed and the telephone A dials (connects to the city or the outside of the city), the dial information is also detected in the exchange through the trunk and supplied to the frequency calculator 16 together with the call start time information. When the call end time information is obtained by the end of the call, the frequency calculation unit 16 calculates the call frequency for the trunk, and the obtained frequency (the call frequency at that time) is added to the content of the frequency storage unit 15 and again. Remembered.

[Embodiment] FIG. 2 shows a block diagram of an embodiment of the present invention.

20-1 to 20-p in FIG. 2 are extension telephones of a private branch exchange,
21 is a network of exchanges, 22 is an information receiving / distributing device (SR
D is shown), 23 is a control unit (including memory), 24 to 26 are external trunks (shown as TRK1 to TRKm), and 27 is an outgoing register trunk (shown as ORT).

Each of the external trunks 24 to 26 in FIG. 2 is connected to a line accommodated in a public exchange, and the usage fee system is the same as in the case of the basic frequency or less as in the case of FIG.

The control device 23 includes a memory 231 for storing the empty / closed states of other trunks and telephones of the device that performs control processing, and an integrated value of the call frequency of each outside line trunk (initialized at a predetermined time).
A memory 232 for storing is provided. The trunks 24 to 27 of the exchange, the network 21, and the control device 23 are connected via an information receiving / distributing device 22 (hereinafter referred to as SRD), and various kinds of information are exchanged through the information receiving / distributing device 22. It

The operation of FIG. 2 will be described with reference to the control flow chart of the control device shown in FIG. 3A and the connection trunk determination flow chart of FIG. 3B.

When a call is made from the telephone set 20-1, it is detected by a line circuit in the network, is notified to the control device 23, and instructs the network 21 to connect to a call register trunk (hereinafter referred to as ORT) 27. After this, when the first dial is received from the originating telephone set 20-1, it is given from the ORT 27 through the SRD 22 to the control device 23. The control device 23 determines whether or not this content is a special number dial (normal number 0) (Fig. 3 (a)).
320), and if so, the connection trunk is determined based on the frequency information (at 340), and if not, connection to the other party according to the subsequent dial is performed (at 330).

The determination flow of this connection trunk will be described with reference to FIG. 3B. First, 1 is set in the variable register n (see
341 in Fig. (B)), the trunk of that number (hereinafter, TRK)
The number of TRKn, in this case TRK1 state 23
Look up number 1 in 1. That is, it is determined whether the first status information in the memory 231 is empty (“1”). If the status information is "0" and the status is closed (busy), the variable register n is incremented by +1 to determine the next trunk number 2. In the empty state (“1”), the count information Cn for that TRKn
(C1 in this case) is read from the memory 232, and it is determined whether it is smaller than the basic frequency K (step 343). If it is smaller than K, it is discriminated whether it is smaller than the value of the lowest value register Mi (K is set as the initial value) (the same).
344), since it is smaller than the value of K at first, the frequency of C1 is written in the numerical part of the register Mi (K is erased).
At this time, 1 which is the trunk number is written in the lowest trunk number section register Ti (step 345).

Next, the content of register n is incremented by 1 (at 346),
It is determined whether the number exceeds the total number N of external trunks (same 347), and if not, the next trunk number 2 (TRK
The same process is performed for 2), the frequency is sequentially checked for the vacant outside trunks, and when the discrimination of all the outside trunks is completed, the contents of the lowest trunk number register Ti are output (348).

Here, moving to FIG. 3A, the control device 23 uses the discriminative trunk information to instruct the network 21 via the SRD 22 a control signal for forming a connection path with the calling terminal (telephone). As a result, the originating telephone set 20-1 is connected to the public exchange through the lowest-frequency trunk and listens to the dial tone from the exchange to dial.
At this time, the dial signal is detected through the outside line trunk (Fig. 3 (a) 360), and the band (local or long-distance number) of the other party is identified and recorded (used for later frequency calculation). ).

Next, when the other party responds, it is detected by reversing the polarity of the line, and it is given to the control device 23 from the trunk of the outside line through the SRD 22 and records the time information, and when the call ends, the control device 23 outputs the same time information. Then, the call frequency is calculated and recorded (step 390). The call frequency is calculated according to a conventionally used method by obtaining the time per frequency from the bandwidth information and calculating the frequency from the call time (end time-start time).

Next, the frequency up to the previous time of the external line trunk stored in the memory 232 is taken out, added to the frequency calculated this time, and the result is stored in the original position of the memory 232 to update the frequency. (The same 400).

[Effects of the Invention] According to the present invention, when the basic charge is the same for each line up to a certain frequency, the outside line trunk can be automatically selected so that the line use charge becomes the lowest, and the telephone line is used. Reduce call costs.

[Brief description of drawings]

1 is a block diagram showing the principle of the present invention, FIG. 2 is a block diagram showing an embodiment of the present invention, FIG. 3 (a) is a control flow chart of a control device, and FIG. 3 (b) is a connection trunk discrimination flow chart. , FIG. 4 is a conventional configuration diagram, and FIG. 5 is a diagram explaining a new line usage fee. In FIG. 1, 10: network 11: control device 12: line state holding unit 13: connection control unit 14: minimum frequency trunk detection unit 15: frequency storage unit 16: frequency calculation unit 17, 18: outside trunk 19: transmission register trunk

Claims (1)

(57) [Claims] 1. A private branch exchange equipped with a plurality of external line trunks (17, 18) each connected to a subscriber telephone line of a system in which the subscriber telephone line of the public telephone exchange has a fixed fee up to a basic frequency In the trunk capture method, the control device (11) of the exchange is equipped with a frequency storage unit (15) that stores the frequency information up to that point for each trunk to be charged, and the minimum frequency trunk detection unit when making a call to an external line trunk. By checking the above-mentioned frequency storage section (15) from the unused external line trunks by (14), the external line trunk whose usage frequency is less than the basic frequency and having the smallest frequency is detected, and the detected external line trunk and calling telephone are detected. Connect to and control unit (1
Connected under the control of 3), and the frequency calculation unit after the call ends (16)
A trunk capturing method in a private branch exchange, characterized in that the frequency of the call is calculated by the method to update the contents of the frequency storage section (15).