JP3412568B2 - Private branch exchange system and line supplement method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private branch exchange system in which a general contract line and a special contract line are in mixed contract, and more particularly, a private branch exchange which performs optimum trunk selection based on frequency information for each trunk. The present invention relates to a system and its line supplement method.

[0002]

2. Description of the Related Art Private branch exchanges are provided with a plurality of outside line (station line) trunks connected to public exchanges. If you dial a special number (usually the number 0) from your local telephone,
It is connected to an outside trunk connected to a public exchange. After that, the connection is made by dialing the telephone number of the other party.

In this case, usually, the line connected to each external line trunk is charged a usage fee (calling fee) according to the call frequency by the public exchange. In Japan, a line charge (or call charge) proportional to the call frequency (frequency x unit charge) is charged (the basic charge is charged separately).
However, recently, it has been proposed to charge by another charge system. In that method, the line charge (call charge) is the same charge up to a certain frequency, and charges higher than that are proportional to the frequency.

In such a tariff system, it is uneconomical to use an outside line (station line) from the private branch exchange as in the conventional case when making a call from the private branch exchange accommodating a large number of contract lines. Effective connection is desired.

An example of a conventional private branch exchange system is shown in FIG.
Shown in.

The private branch exchange 40 of FIG. 4 accommodates a plurality of telephones 41 to 43 and a plurality of external line trunks (TRK) 44 and 45 for connecting to the public exchange 46.
Each of the outside line trunks 44 and 45 is connected to a public exchange 46 via telephone lines 47 and 48. Public exchange 46
Accommodates a plurality of telephones 49, 50.

To connect from the telephone 41 of the private branch exchange 40 to an outside line, a special number (0) is dialed from the telephone 41. As a result, for example, an empty outside trunk 44 or 45 is supplemented. At this time, a dial tone is sent from a call register trunk (not shown) of the public exchange 46.
After that, by dialing the telephone number of the other party, the person is connected to the person in the city or outside the city.

Each telephone line 4 connected to the outside line trunks 44 and 45 accommodated in the private branch exchange 40.
Every time a call is made from the private branch exchange 40 to 7 and 48 (call by call), the frequency corresponding to the call is added for each line. Then, once a month, the user of the private branch exchange 40 is charged a usage fee according to the frequency.

However, recently, as the number of operators of public lines increases, the system of usage charges for telephone lines tends to become complicated. That is, there is a tendency that systems different from the conventional ones or mixed systems with the conventional ones are mixed.

As one system, the frequency is calculated for each call by distance and time, and if the call frequency for a certain period (one month) is less than a certain frequency (basic frequency), the same charge is applied,
For the amount exceeding that, a method of adding a charge proportional to the frequency is considered. This is a kind of basic charge because it costs even if the frequency is less than a certain frequency.

FIG. 5 shows the form of the line usage fee under the general contract and the special contract.

[0012] Generally, the telephone call charge is charged according to the monthly basic charge and the frequency used in the month.
This is general contract A. On the other hand, for a large user, for example, the basic charge is set higher than the basic charge of a normal service, and instead, a charge other than the basic charge is not performed until a predetermined usage frequency. Then, the telephone call for the amount exceeding the predetermined usage frequency is charged according to the usage frequency. This is called special contract B.

That is, in the special contract B, the call frequency is K.
In the following cases, a fixed basic charge is imposed, and a charge proportional to the call frequency is added for the call frequency exceeding K.

Therefore, as can be seen from FIG. 5, rather than using the trunk of the general contract A, when the trunk of the special contract B is used up to a certain frequency that can be used within the range of the basic charge,
This service will be used efficiently. Specifically, if the line is used only up to basic frequency Z,
General contract A is more economical. On the other hand, when a line with a basic frequency of Z or more is used, it is more economical to use the special contract B on the contrary.

According to the conventional private branch exchange system of FIG. 4, the special line dials from the telephones 41 to 43 are checked for open / closed trunks 44, 45 in a fixed order. Then, by first complementing the available outside trunk 44 or 45, the telephone connection to the city or the outside of the city is executed. For example, if the outside line trunks 44 and 45 are supplemented in the order of the outside line younger number (younger number), the usage rate of the outside line trunks 44 and 45 within a certain period becomes higher.

Then, in FIG. 5, the call frequency of the outside line trunks 44 and 45 is the smallest outside line trunks 44 and 4.
5 has reached the basic frequency K, and other trunks 4
A state occurs in which 4,45 does not reach the basic frequency K yet.

In addition, the private branch exchange 40 is used as the outside line trunk 4
Even if the supplements of 4, 45 are changed so as to be randomly selected, some of them similarly reach the basic frequency K and some of them do not reach them.

At this time, if the outside line trunk 44 or 45 having reached the basic frequency K is supplemented, the frequency is newly added, and the charge is added to the basic charge in proportion to the new frequency.

[0019]

As described above, in the above-mentioned conventional private branch exchange 40, when receiving the services of the general contract A and the special contract B, if the outside line trunks 44 and 45 are supplemented in a young or random manner, The cost for each line becomes uneven. In this case, there is a problem in the operation of the private branch exchange system that the usage fee of only some of the outside line trunks 44 or 45 becomes high.

The present invention has been made in view of such a situation, and when receiving a service of a general contract or a special contract, it is possible to reduce a call cost by efficiently selecting a contract line. (EN) Provided is a private branch exchange system and a line supplementing method therefor.

[0021]

A private branch exchange system of the present invention is a private branch exchange system in which a general contract line and a special contract line are mixed and contracted, and a first trunk for general contract and a special contract are used. A second trunk for the first, and a first and
A frequency storage unit for storing the frequency of use of the second trunk;
Line status maintenance that maintains the usage status of the first and second trunks
And a control device having a lifting portion, the control device usage
When an outgoing call to an outside line occurs, based on the number and usage status,
Priority is given to the second trunk that has not reached the basic frequency
However, the usage frequency of the first and second trunks exceeds the basic frequency.
When the power is on, the usage frequency of the first and second trunks
Complement the fewest ones, and make the first incoming call from an outside line
It is characterized in that it is preferentially assigned to the trunk . Starting
The line supplementing method of the private branch exchange system of Ming is the line supplementing method of the private branch exchange system for supplementing the optimum line of the private branch exchange with which the general contract line and the special contract line are mixed together. and performing line connection through the trunk, and performing line connection via the second trunk for special agreement, use of the first and second trunk
When an outgoing call to an outside line occurs, based on the number and usage status,
Priority is given to the second trunk that has not reached the basic frequency
However, the usage frequency of the first and second trunks exceeds the basic frequency.
When the power is on, the usage frequency of the first and second trunks
Complement the fewest ones, and make the first incoming call from an outside line
And a step of preferentially allocating the trunk to the trunk . In the private branch exchange system and the line supplementing method thereof according to the present invention, the incoming call from the outside line preferentially supplements the general contract line, and the outgoing call to the outside line reaches the call frequency that can be covered by the basic charge as the special contract line. The special contract line is preferentially supplemented so that the special contract service can be effectively used.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

FIG. 1 is a block diagram showing an embodiment of a private branch exchange system of the present invention, and FIGS. 2 and 3 are flow charts for explaining the operation of the private branch exchange system of FIG.

The private branch exchange system shown in FIG. 1 comprises a private branch exchange 10, a controller 11, and a public exchange 25. The private branch exchange 10 includes a telephone 21 and an outside line trunk 1.
9 and 20, special contract line trunks 22 and 23, and outgoing register trunk 24 are accommodated.

The external line trunks 19 and 20 and the special contract line trunks 22 and 23 are connected by telephone lines housed in the public exchange 25, respectively. Further, as described with reference to FIG. 5, the usage fee for the line of the special contract B is the same fee up to the basic frequency K. If the frequency exceeds that, a unit price will be added to the exceeded frequency.

The control device 11 controls the operation of the private branch exchange 10, and includes a line state holding unit 12, a connection control unit 13, a minimum frequency trunk detection unit 14, a frequency storage unit 15,
A frequency calculation unit 16, a frequency comparison unit 17, and a trunk blockage control unit 18 are provided.

The line status holding unit 12 holds the usage status of the line. The connection control unit 13 controls the connection of the line according to an incoming call from the outside line or an outgoing call to the outside line.

The minimum frequency trunk detecting section 14 detects the one having the lowest usage frequency of the outside line trunks 19 and 20 and the special contract line trunks 22 and 23. Frequency storage unit 15
Stores the usage frequency of the outside line trunks 19 and 20 and the special contract line trunks 22 and 23.

The frequency calculator 16 determines the outside line trunks 19 and 20 and the special contract line trunks 22 and 2 according to the line usage.
Calculate the usage frequency of 3. The frequency comparing unit 17 compares the frequencies used in the outside line trunks 19 and 20 and the special contract line trunks 22 and 23.

The trunk blockage control unit 18 preferentially supplements the general contract line with an incoming call from an outside line in order to easily supplement the line of the special contract B which does not reach the basic frequency K from the contract type. Control.

When a call is made from the private branch exchange 10 to an outside line, the frequencies and contract types of the outside line trunks 19 and 20 and the special contract line trunks 22 and 23 at that time are checked. At this time, the outside line trunks 19 and 20 and the special contract line trunks 22 and 2 that have not reached the basic frequency K
The lowest frequency of 3 is detected.

Next, the telephone 21 is connected to the outside trunk 1
A call is made by connecting to any of the trunk lines 9 and 20 and the special contract line trunks 22 and 23, and when the call ends, the call frequency is calculated and the content of the frequency storage unit 15 is updated.

Further, in order to easily supplement the line of the special contract B which does not reach the basic frequency K from the contract type, an incoming call from an outside line preferentially supplements the general contract line. Further, when making an outgoing call to an outside line, a line which does not reach the call frequency that can be covered by the basic charge is preferentially selected as a line of the special contract B so that the service of the special contract B can be used.

Next, the operation of the private branch exchange system having such a configuration will be described with reference to FIGS. In the figures described below, the contract A is the general contract A in FIG. 5, and the contract B is the special contract B in FIG.

First, in the trunk blocking control unit 18 of the control device 11 of FIG. 1, the line state holding unit 12 and the frequency storage unit 15 are provided.
And are accessed to execute the frequency search processing shown in FIG. 2 (step 201). This is to make it easier to supplement the special contract line trunks 22 and 23 when an external line is transmitted from the private branch exchange 10.

That is, first, from the frequency storage unit 15, the outside line trunks 19 and 20 and the special contract line trunks 22 and 23.
Is detected, and it is determined whether the usage frequency is less than the basic frequency K (step 202).

When there is a trunk with a usage frequency smaller than the basic frequency K, the line status holding unit 12 searches for an idle status of the line (step 203). If there is an empty trunk, the special contract line trunks 22 and 23 of the special contract B are blocked for an incoming call from the public exchange 25 (steps 204 to 207).

As a result, the outside line trunks 19 and 20 of the line of the general contract A are supplemented to the incoming call from the outside line.

On the other hand, if the number of uses of each trunk is K or more in (step 202), the trunk with the least number of uses is searched (step 20).
8). And the one with the lowest usage frequency is the special contract B
Special trunk line trunks 22, 2
3 is closed (steps 209 and 210). If the trunk with the lowest usage frequency is the general contract A trunk,
The outside trunks 19 and 20 are closed (step 2)
11).

On the other hand, in the connection operation from the private branch exchange 10, the call is connected to the outgoing register trunk 24 of the private branch exchange 10 and the dial information from the telephone 21 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 frequency comparison unit 17 is activated and the frequency comparison processing of FIG. 3 is executed (step 301).

Here, first, the external line trunks 19 and 20 and the special contract line trunks 22 and 23 are stored in the frequency storage unit 15.
Is detected, and it is determined whether the usage frequency is less than the basic frequency K (step 302). If there is no trunk smaller than the basic frequency K, the trunk with the lowest frequency is supplemented (step 303).

If there is a trunk smaller than the basic frequency K, the contract type of the trunk is determined (step 3).
04). If the trunk smaller than the basic frequency K is the special contract B, the trunk of the special contract line trunks 22 and 23 is supplemented (steps 305 and 306).
On the other hand, if the trunk smaller than the basic power K is not the special contract B, the outside trunks 19 and 20 are supplemented (step 307).

Here, when a trunk smaller than the basic frequency K is the special contract B, the frequency and the trunk information are held in the minimum frequency trunk detection unit 14. The frequency comparing unit 17 similarly determines the next trunk. If the trunk is equal to or greater than the basic frequency K in the special contract B, the detection operation for the trunk is not performed and the next trunk is checked.

Further, in the minimum frequency trunk detection unit 14,
When the trunk information having a frequency smaller than the basic frequency K is newly stored, the new frequency is compared with the previously stored frequency, and if the new frequency is smaller, the frequency and the trunk information are stored. Then, the contents held before are cleared.

Further, when the trunk smaller than the basic frequency K is not the special contract B, the minimum frequency trunk is read after reading the information indicating the line vacancy status of the line status holding unit 12 and the usage frequency of the frequency storage unit 15. The detection unit 14 detects the trunk with the lowest frequency.

In this way, the power comparing unit 17 and the minimum power trunk detecting unit 14 allow the outside trunks 19 and 2 to be connected.
0 and the special contract line trunks 22 and 23 are detected. Finally, the lowest frequency trunk detection unit 1
4, the trunk information with the lowest frequency less than or equal to the basic frequency K is preferentially obtained on the line of the special contract B.

Then, the connection control unit 13 controls the connection to the telephone 21 based on the detected information, and forms a connection path between the two on the private branch exchange 10.

When the connection path is formed and the telephone 21 dials (connects to the inside or outside the city), the private branch exchange 10
Also in (1), dial information is detected via the selected trunk, and call start time information and the like are supplied to the frequency calculation unit 16.

When the call end time information is obtained by the end of the call, the call frequency for the trunk is calculated by the frequency calculating unit 16, and the used frequency is added and stored in the frequency storing unit 15.

As described above, in this embodiment, an incoming call from an external line preferentially supplements the external line trunks 19 and 20 of the general contract A, and an outgoing call to the external line is a line of the special contract B at a basic charge. Since the special contract line trunks 22 and 23, which have not reached the available call frequency, are preferentially supplemented to effectively use the service of the special contract B, the call cost can be reduced.

In the present embodiment, the frequency comparing section 17
Thus, a case has been described in which the trunk with the lowest frequency is detected and processed based on the information of the line state holding unit 12 and the information of the frequency storage unit 15. However, the information of the line state holding unit 12 and the frequency storage unit 15 are described. Based on the information, the minimum frequency trunk detection unit 14 may be notified in advance of the empty trunk information with a certain frequency or less. In this case, the frequency comparison unit 17
Since it only needs to detect the lowest frequency trunk among the notified trunks, the processing becomes faster accordingly.

[0052]

As described above, according to the private branch exchange system and its line supplementing method of the present invention, an incoming call from an external line is preferentially supplemented by a general contract line, and an outgoing call to an external line is made as a special contract line. By preferentially supplementing the special contract line that does not reach the call frequency that can be covered by the basic charge, the special contract service is effectively used, so that the call cost can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing a communication network according to an embodiment of a private branch exchange system of the present invention.

FIG. 2 is a flowchart for explaining the operation of the private branch exchange system of FIG.

FIG. 3 is a flowchart for explaining the operation of the private branch exchange system of FIG.

FIG. 4 is a block diagram showing an example of a conventional private branch exchange system.

FIG. 5 is a diagram showing a form of line usage fee.

[Explanation of symbols]

10 private branch exchange 11 Control device 12 Line status holding unit 13 Connection control unit 14 Minimum frequency trunk detector 15 frequency memory 16 frequency calculator 17 frequency comparison section 18 Trunk blockage controller 19,20 Outer trunk 21 telephone 22,23 Special contract line trunk 24 Outgoing register trunk 25 public exchange

Claims (2)

(57) [Claims] 1. A private branch exchange system in which a general contract line and a special contract line are mixedly contracted, wherein a first trunk for a general contract, a second trunk for a special contract, and the first and the second trunks. Frequency that stores the usage frequency of the second trunk
The storage unit and the use states of the first and second trunks are maintained.
And a control device having a line status holding unit for lifting, the control device, based on the use frequency and use,
When a call to an outside line occurs, before the basic frequency is reached
Note that the second trunk is preferentially supplemented, and the first and second trunks are
When the trunk usage frequency exceeds the basic frequency,
The least used number of the first and second trunks
In addition, an incoming call from an outside line is added to the first call.
A private branch exchange system characterized by the priority allocation to 2. A line supplement method of a private branch exchange system for supplementing an optimum line of a private branch exchange with which a general contract line and a special contract line are mixed, wherein the line is provided through a first trunk for general contract. Engineering to make a connection
And the extent, engineering to carry out a line connection via a second trunk for a special contract
And degree, the power and use state using the first and second trunk
Based on this, when an outgoing call to an outside line occurs, the basic frequency is reached
The first trunk that does not
And the usage power of the second trunk exceeds the basic power
When, the usage frequency of the first and second trunks is the highest
In addition to supplementing the few, the call from the outside
The method of supplementing the line of the private branch exchange system, comprising: