JPH0669233B2 - Control system for electronic private branch exchange - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a control system for improving the efficiency of a switching processing function of an electronic private branch exchange at the time of originating a local line and economically operating a billing call. .

[Technical background of the invention]

Conventionally, in an electronic private branch exchange (hereinafter, referred to as PBX) that has a specific line or a dedicated line in addition to a general public line, a station line trunk (hereinafter, referred to as a trunk) that controls connection to these lines is simply a signal format of the line. In addition to the difference in the number of calls, it is divided into multiple classes according to the charging system and dial number system, and the connection priority for the call from the originating station in the switching network is set on the trunk of each class, and this connection priority is set. There is one that detects a trunk that can be connected to a line according to the order and connects the line. like this
In the PBX, the connection priorities are set in ascending order of the usage charge, whereby economical operation of billing calls can be achieved.

The Bell telephone switching network in the United States is widely known as such a PBX. This is the establishment of a switched line network of different charge classes called "relay lines" that are rented at different charges. The full business day (FBD) / wide area telephone system (WATS) line network is a single charge. The system is designed for wide-area use, and the frequency (MT) / WATS line network has a different charge system, and the straight-line long distance dial (DDD) line network has a different charge system, depending on the usage mode. This is what was planned. Therefore, it is possible to save the call charge by selecting the trunks connected to such a line network in ascending order of the charge.

Therefore, in this Bell Telephone Switching Network in the United States, if there is a call to a central office line, it is first detected by sequential scanning whether or not there is an empty trunk in the FBD circuit network with the lowest charge,
If there is no empty trunk, the scanning method is used in which the presence or absence of an empty trunk in the MT network is detected next.

Other scanning methods for this empty trunk include (a) no-waiting long-distance restriction, (b) long-distance waiting, and (c) waiting for a certain period of time, all of which have low usage charges. It is common in that empty trunks are sequentially detected in order.

[Problems of background technology]

However, in the above-mentioned empty trunk scanning method, since it is detected whether or not all the trunks for which the priority order has been set are available, until the presence of an empty trunk is detected when the call volume is large. The time of
There is a problem in that the caller is forced to spend an unnecessary waiting time, and moreover, the caller is selectively connected to a trunk with a high usage charge against the will. Further, during this period, the control device which detects such an empty trunk must continue the sequential scanning of each trunk until an empty trunk is detected. Therefore, there is a problem in that the load on the control device increases, which is a factor that further increases the waiting time for the caller, which is not preferable.

[Object of the Invention]

The present invention eliminates the above drawbacks, reduces the burden on the control device,
Another object of the present invention is to provide a control system for an electronic private branch exchange which can reduce wasteful waiting time, save usage charges, improve efficiency of exchange processing functions and promote economical operation of billing calls.

[Outline of Invention]

The present invention achieves the above object by varying the range of trunks selected according to a predetermined priority order according to the combination of the calling terminal and the calling time zone.

Example of Invention

Hereinafter, the present invention will be described based on examples. FIG. 1 is a block diagram showing an embodiment of the present invention, in which n electronic key telephones (hereinafter referred to as EKTs) 1a to 1n are installed in a switching network. These EKT1a to EKT1n are connected to a speech path network (hereinafter referred to as SW) 3 via line circuits (hereinafter referred to as LC) 2a to 2n, respectively.

The SW3 is connected to the m-group aisle line groups La to Lm classified into, for example, the charge systems by way of the m-group trunk circuit groups (hereinafter referred to as TRK) 4a to 4m.
In this case, the call line groups La to Lm of the m group are each y
Consists of ₁ call line l _{1 to} ly from this call line l ₁
trunk circuits 4a~4m corresponds to ly also constituted by y-number of the trunk circuit TRK ₁ ~TRKy respectively.

These SW3 and TRK4a to 4m are connected to a central processing unit (hereinafter referred to as CC) 6 via a control data bus line 5 and a communication line group La to according to control data stored in advance in a memory (hereinafter referred to as MEN) 7. Control is performed so that a speech path between Lm and EXT1a to EKT1n and a speech path between EKT1a to EKT1n are formed.

On the other hand, in addition to the control information for forming a communication path, the MEM7 has a memory block as shown in FIGS. 2 (a) to 2 (e) in order to improve the efficiency of the exchange processing function and economically operate billing communication.
MB1 to MB5 are provided, of which the first memory block MB
1 stores therein trunk circuit group numbers TG _{1 to} TGj (j ≦ m) that can be selected in each of the m types of toll dial numbers. Also, the second memory block
The MB2, data of "when" and "minutes" for the start time of each time zone in the case of dividing 24 hours a day to more than one time zone SCHTM1~SCHTMi [HH _1: MM _1] - [HHi: MMi] Are stored by time zone. Furthermore, E is set in the third memory block MB _3.
Outgoing station selection range data LCx that specifies the range of trunk circuit groups that can be selected by EKT1a to EKT1k corresponding to EKT1a to EKT1k that can make station line transmissions among KT1a to EKT1n
(X = 1 to m) is stored. The fourth memory block MB4 stores selection range data l (≤j) that specifies the range of trunk circuits that can be selected according to the combination of the selection range data LCx for each transmission terminal and the time zones SCHTM1 to SCHTMi. Has been done. Furthermore, the fifth memory block MB5
The present time data HHp: MMp of "hour" and "minute" whose contents are sequentially updated in CC6 are stored in the.

In such a configuration, EKT1a ~ EKT1n is usually provided with a handset 11 and its hook mechanism 12, a dial mechanism 13 and various service keys 14, the local line transmission by this EKT1a ~ EKT1n, the handset 11 After hooking off, the call is made by dialing the call request number of the desired office line and the subsequent area line dial number.

Here, EXT1a is a telephone that can make station-line calls.
The processing when the station line is transmitted from 1a will be described with reference to the flowchart of FIG.

First, when a call operation is performed in EKT 1a, the call information by this call operation is transferred to CC 6 via LC 2a. Then, CC6 sends a dial tone to EKT1a when SW3 is in a state where the line connection can be made to the call information from EKT1a, and confirms that the dial tone operation of the extension or the area code can be performed. Inform. As a result, when only the required number of digits of the extension number or the area code is input from the EKT 1a via the LC 2a, the CC 6 determines whether the extension lines are connected to each other or the station line is connected. As a result, when CC6 finds that the dial information requires a station line connection, CC6 again
A dial tone is sent to the caller to inform that the dial-in operation of the dial number information in the area following the area code is possible. As a result, when EKT1a inputs dial number information within the area via LC2a, CC6 classifies the form of the area dial number as shown in step 21 of FIG. 3, and based on the classification result. Trunk circuit group number TG ₁ that can be selected according to the area number dialing type
Read TGj from memory block MB ₁ . At this time, the area number dialing form is TRKKD1 to TRKKDm
If it is Dh, the trunk circuit group numbers TG _{1 to} TGj that can be selected by the type TRKKDh of the area number dialed form are read from the memory block MB ₁ (step 22). After that, the CC 6 reads the current time HHp: MMp from the memory block MB ₅ , and further determines which one of the predetermined time zones SCHTM1 to SCHTMi the current time zone corresponds to based on the current time HHp. The determination is made based on the stored contents of MB ₂ (step 23).

Subsequently, the CC 6 reads from the memory block MB ₃ the source station selection range data LCx that specifies the range of the trunk circuit group that the EKT 1a can select (step 24). Here, assuming that the current time zone is SCHTMh and the selection range data is LCh, then CC6 stores the selection range data 1 of the trunk circuit group corresponding to the combination of these data SCHTMh and LCh in the memory block. Read from MB ₄ (step 25).

Then, CC6 selects the selection range data 1 of the trunk circuit group for EKT1a thus obtained and the memory block MB _{1 first.}
The transmission trunk circuit group is selected based on the trunk circuit group numbers TG _{1 to} TGj that can be selected by the type TRKKDh of the area number dialed from the station.

The selection of the transmission trunk circuit group is completed by sequentially scanning from the trunk circuit group TG ₁ having the highest priority to the trunk circuit group up to the range indicated by the selection range data 1.

Specifically, the CC 6 sets the count value “1” in the counter for scanning the trunk circuit group (step 26), and first checks whether or not there is an empty trunk in the trunk circuit group TG ₁ having the first priority. Check and if there is a free trunk, the originating station EKT1
The a is connected to this air trunk, the area office dial number corresponding to the trunk circuit group TG ₁ is sent to this air trunk, and the trunk selection and station line transmission processing ends.

However, if there is no vacant trunk in the trunk circuit group TG ₁ , CC6 determines that the selected range data l is a value of "l ≧ 2", and the trunk circuit registered in the second highest priority order. It is checked whether or not there is an empty trunk in the group TG _2, and if there is an empty trunk, the EKT 1a is connected to this empty trunk as in the case described above, and the trunk selection and station line transmission processing is completed.

The CC 6 continues such a trunk selection process up to the trunk circuit group in the range indicated by the selection range data 1.
For example, l = 3, and trunk circuit group numbers that can be selected according to the area number dialing order are assigned in order of priority.
If TG ₁ , TG ₃ , TG ₅ , TG ₆ , TG ₇ is CC ₆ , T is
Three trunk circuit groups TG ₁ , TG ₃ and TG in the order of G ₁ , TG ₃ and TG _5.
Check if there is an empty trunk at ₅ . Also, l = 5
, The five trunk circuit groups TG ₁ and T
Check all of G ₃ , TG ₅ , TG ₆ and TG ₇ for free trunk according to priority.

As a result of checking the presence / absence of an air trunk up to the trunk circuit group in the range indicated by the selected range data l in this way, if any trunk circuit group has an empty trunk, this empty trunk is detected at the time of detection. And the originating station
The connection with EKT1a is established, and the trunk selection and station line transmission processing ends.

However, if there is no empty trunk until reaching the trunk circuit group in the range indicated by the selection range l, the CC 6 sends a busy tone to the EKT 1a and then terminates the trunk selection process.

The processing for detecting the presence / absence of an empty trunk is performed in steps 27 to 30 in FIG. 3, and the processing for originating a local line is performed in step 31. Further, the busy tone transmission processing is performed in step 32.

As described above, in this embodiment, the trunk circuit groups that can be selected according to the type of the area number dialed number are registered in the priority order, and the range of the trunk circuit groups selected in this priority order is called to the calling station. It is configured to be variable according to the combination with the time zone. Therefore, by narrowing the range of the trunk circuit group selected in the priority order during the time when calls are concentrated, the busy tone is not immediately output, and the caller is not forced to useless waiting time. It is possible to avoid the situation where you are connected to a high-priced line against your will. At the same time, the burden on CC6 that performs this station line selection processing is also reduced.

On the other hand, for a specific transmitting station, the range of selectable trunk circuit groups is extremely narrowed or enlarged to make it unusable at all, or ignore the charge and immediately connect to any station line. It becomes possible to operate such as.

As a result, it is possible to improve the efficiency of the exchange processing function and economically operate billing calls.

In the embodiment, the calling station is a key telephone, but any device that uses a telephone line can be applied.
Further, the trunk circuit has a group configuration corresponding to y station lines per group, but it is not necessary to have a group configuration if there is no grouping of station lines.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, the trunk range selected according to the predetermined priority is variably set according to the calling station and the calling time zone. There is an excellent effect that the burden on the control device to be performed can be reduced, the efficiency of the exchange processing function can be improved, and the economical operation of billing call can be promoted.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a memory block provided in the memory in the embodiment of FIG. 1 and its stored contents, and FIG. It is a flowchart of the trunk selection process when there is. 1a to 1n ... electronic key telephone, 2a to 2n ... line circuit, 3 ... communication path network, 4a to 4m ... trunk circuit group, 6 ... central processing unit, 7 ... memory.

Claims (1)

[Claims] 1. A plurality of terminals are accommodated, and a plurality of trunks respectively connected to lines having different charge systems are accommodated, and the plurality of trunks are grouped in accordance with a charge system of lines connected to the trunks. When making a call from the terminal, the trunk group is searched according to a predetermined priority set according to the tariff system, and the line connection is made using the trunk belonging to the searched trunk group. In the control method of the electronic exchange, the memory is provided for storing a range of a group of trunks to be searched according to the terminal and the calling time zone, and the memory of the memory is stored according to the calling terminal and the calling time zone. A control system for an electronic exchange characterized by varying the range of trunk groups to be searched based on stored contents.