JPH01246948A - Private branch telephone system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to improvements in private telephone systems.

(Prior Art) As is well known, a private branch exchange (PBX) is a device that performs switching operations such as connecting multiple telephone extensions under its control, connecting an extension to an outside line, and connecting an outside line to an extension telephone. In recent years, with computerization using microprocessors, in addition to these basic functions, various service functions such as message registration, speed dial registration, etc. have been provided, and the devices have become multifunctional.

By the way, as is well known, private branch exchanges have pooled central lines.
Some devices have a line (pooled line) function. In this central office line pooled line system, a collection of multiple central office lines (hereinafter referred to as a trunk group) is associated with one key of a multi-function telephone (hereinafter, this key is referred to as a pooled line key). K
It has a function that allows you to respond to incoming calls from the central office line and to make calls by operating the key.

Usually, multiple multi-function telephones are equipped with a pooled line key (hereinafter referred to as PLK) for the same trunk group, and in this function, a call from a certain central office line is routed to the trunk to which this central office line belongs. P assigned to group
Calls arrive at all multifunction telephones that have a LK, but if there is no free space on any of the multifunction telephones to which these PLXs are assigned, the incoming call from the central office line is routed to the trunk group to which this central office line belongs. Camp On (call waiting) is performed on all telephones that have PLK, that is, they are registered as waiting for an incoming call, and among these telephones, a camp-on call (a call that is registered as waiting for incoming) is made to a vacant telephone.
Control is performed so that these camp-on calls are sequentially read out and received until they are exhausted.

As mentioned above, PLKs corresponding to the same trunk group are usually provided on multiple multifunction telephones, so below, a collection of PLKs corresponding to the same trunk group will be referred to as PLK.
Let's call it the K group.

Hereinafter, a conventional system of PLK allocation in a private branch exchange using the central line pooled line system will be explained with reference to FIGS. 4 to 7 regarding the reception of a camp-on call to a telephone set.

First, FIG. 6 shows the processing of a private branch exchange (PBX) when an incoming call from a central office line occurs. As shown in the figure, when an incoming call from the central office line occurs (521), the central processing unit in the PBX sends a telephone with an empty PLK (
More precisely, it is checked whether there is an open extension among the connected telephones with the PLK. As shown in FIG. 5, the number of free telephones with PLK is maintained for each PLK group, and is stored in a table that is updated in accordance with the situation, so it can be checked by referring to this table. The number of idle telephones having PLKs (hereinafter referred to as idle PLKs) is counted by the central processing unit when the system is powered on, and is stored in memory. When there is a free PLK, calls will be received on all the free PLK phones, so
In step S23, the "number of free PLKs" is set to "0", and in step 825, the central processing unit
Sends a ring tone to the telephone with K. Although not shown in the figure, if any of the telephones responds, the number of other free PLK telephones is calculated and the "Free PLK"
This value will be entered in "Number of LK". Further, in step 322, if there is no free PLK, the process proceeds to step S24, where the camp-on information is stored.

FIG. 4 shows an example of a storage table for camp-on information.

The circuit numbers of the trunks waiting for incoming calls are sequentially stored in the table corresponding to the PLK groups. Then, based on the information in this table, each telephone is registered for camp-on, and when an empty PLK telephone becomes available, that telephone is controlled to receive a camp-on call. The camp-on registration of the telephone for PLK is canceled, and the PLK telephone that becomes vacant after that is used to deal with incoming calls from the central office line.

FIG. 7 shows the processing flow when a camped-on call is sent to PLK.

First, in step S7L, when the telephone that was in use ends the call (takes the handset off-hook), the central processing unit of the PBX uses the vacant PLK of the telephone to call the area corresponding to the PLK group in FIG. and check whether there is a call camped on (
872). As a result, if there is a call that is camped on, in step S74, the camp is turned on first.
Deletes the camp-on information of the turned-on station line and aligns the remaining camp-on information to the left. In step 875, a ringing tone is sent to the terminated telephone in response to an incoming call from the central office line whose information has been deleted. From then on, the normal incoming call sequence will be executed.

In addition, if in step 372 there is no camped-on central office line, in step S73 when an empty PLK telephone occurs, the number of empty PLKs in the area corresponding to the PLK group in FIG. 5 is set to "1". "increase. Thereafter, a normal end-of-talk sequence will be executed.

By the way, according to the above-mentioned conventional exchange, when there are multiple PLKs in a PLK group and these PLKs are placed on multiple multifunction telephones, the method for receiving a camp Φ on call is Camp-on to the PLK was registered in response to each call, and when a call was received to an empty PLK, the camp-on to other unoccupied PLKs was controlled to be canceled for that incoming call. . Therefore, all remaining camp-on calls were subsequently received only to the first PIJ telephone that became available, and only this telephone received calls. Therefore, even if another PLK phone in the PLK group becomes free, calls will not be received on that phone.
There are fewer chances to get a response.

(Problem to be Solved by the Invention) In a private branch exchange using a pooled line system, multiple central lines are associated with one key on a multi-function telephone, and incoming calls from the central line can be answered by operating the key. The system is designed so that the key function can be assigned to each of the multiple multifunction telephones under the control, and incoming calls are made to the telephones that are free among them. be.

However, according to the above-mentioned conventional switching equipment, camping
The on-call reception method is based on multiple PLKs within the PIJ group.
If you have a phone and these PLKs are placed on multiple multi-function phones, you can register camp-on to the PLK for each phone, and register the camp-on to the PLK when it becomes available. When an incoming call is received, the camp-on to other unoccupied PLK telephones is canceled for that incoming call. Therefore, all camp-on calls will be made on the first available PL.
The call was received only to K's telephone, and the call was only received to this telephone. Therefore, when a call comes in to this phone and there is a ringing camp-on call, the same P
Even if other PLK telephones in the LK group become free, calls will not be received on that telephone, reducing the chance that camp-on calls will be answered.

Therefore, an object of the present invention is to respond to a camp-on call by allowing a call to be received on another PLK telephone in the same PLK group when it becomes free when there is a camp-on call that is ringing. To provide a local telephone system capable of increasing the number of incoming telephones.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention is configured as follows. That is, a plurality of central office lines are associated with one key on a multifunction telephone, and an incoming call from the central office line can be answered by operating the key, and the key function can be applied to each of the plurality of multifunctional telephones. In a telephone system using a private branch exchange using a central line pooled line system, the private branch exchange is configured such that incoming calls are made to idle telephones among these telephones. A registration means for registering a newly generated incoming call in a waiting state in a table when all of the functional telephones are in use; and a registration means for registering a newly generated incoming call in a waiting state in a table when each of the multifunctional telephones becomes vacant; The apparatus further comprises a control means for controlling all available multifunction telephones to receive the incoming call until the incoming call is read and answered.

(Function) In such a configuration, when there is an incoming call from the central office line, the pooled line function allows you to answer the incoming call from the central office line by key operation. Receive a call on a multi-function phone and make the ringtone sound. Then, by operating the pooled line key of the multifunction telephone that received the call, the user can answer the call from the central office line. Further, when a new incoming call occurs when all of the multifunctional telephones having the relevant key functions are in use, the registration means registers this incoming call in the table as a waiting state. When the multifunction telephone becomes vacant, the control means reads out the incoming call in the waiting state registered in the table, and sends the incoming call to all the vacant multifunction telephones until the incoming call is answered. control to receive calls. Therefore, when all of the multifunction telephones having the relevant key functions are in use, a new incoming call will not be accepted until the multifunction telephone becomes available and the incoming call is answered. The incoming call will be received on all telephones, so
It becomes possible to provide a local telephone system that allows for an increase in the number of incoming telephones for camp-on calls.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of this device. 1 in the diagram
is a central office pooled line type private branch exchange (hereinafter referred to as PB).
2 is a central processing unit (hereinafter referred to as CPU).
), 3 is a memory, 4-1 to 4-n are line circuits, 5 is a communication path circuit, 6 is a data highway, and 8-1 to 8
-n is a trunk circuit, 7-1 to 7-n are multifunction telephones (
This is an electronic key telephone (EKT). The call path circuit 5 performs exchange connections between the multifunction telephones 7-1 to 7-n, which are extension telephones, or from an extension to an outside line, and from an outside line to an extension. It is in charge of various controls of the entire system, including the control of exchange connection operations. The memory 3 is the CP
It stores data such as various control programs of U2, various tables, and set function contents. The line circuits 4-1 to 4-n are connection interfaces provided for each extension, and serve as connection interfaces between the communication path circuit 5 and the multifunction telephones 7-1 to 7-n, which are each extension telephone. Become. In addition, trunk circuits 8-1 to 8-n are circuits that interface with the communication line circuit 5 and the corresponding office lines 11 to 1n, and also perform incoming call detection, DC loop closure for circuit capture, etc. be.

Further, the CPU 2 includes a plurality of trunk circuits 8-1 to 8-1.
Each of 8-n is associated with a key on the multi-function telephone, and the pooled line key function (pooled line key function) allows you to answer an incoming call from the central office line by operating that key.
PLK function), and the PLK function is assigned to each or several of the plurality of multifunction telephones 7-1 to 7-n. Incoming calls from the central office line are made to unoccupied telephones among these multifunctional telephones with PLK function, and all multifunctional telephones with PLK function are in use. When a newly generated incoming call is registered in the table as a waiting state, that is, camped on, and when a multifunction telephone with a PLK function becomes available, an incoming call registered in the waiting state in the table, i.e. Read Camp On, receive the camp on call, sound the ringtone, and call the camp on.
Until the on-call is answered, the PLK that becomes vacant after that
It is equipped with a control function that controls all multi-function telephones that have this function to receive the camp-on call and to sound the ring tone. This function is realized by causing the CPtJ 2 to execute a program stored in the memory 3. Further, tables necessary for this control, including the tables shown in FIGS. 4 and 5, are stored in the memory 3. The tables shown in FIGS. 4 and 5 are used to store circuit numbers of camped-on trunks and the number of free PLKs in a PLK group in correspondence with PLK groups. Further, the telephones 7-1 to 7-n are connected to the data highway 6 via line circuits 4-1 to 4-n, respectively.

Next, the operation of this device having the above configuration will be explained. The processing when a call is received from the trunk is the same as the conventional one explained in Fig. 6, and when a call is received from the trunk, P
CPU 2 in BX l is the fifth CPU stored in memory 3.
It is checked whether there is a free PLK in the PLK group corresponding to the l-rank group that received the call in the figure, and if there is a free PLK, it is stored in the memory 3 in order to receive the call at the telephone opportunity of that free PLK. Set the number of free PLKs in the PLK group corresponding to the incoming trunk group in Figure 5 to "0",
The CPU 2 sends a ring tone to the telephone set having an empty PLK. From then on, follow the normal incoming call sequence.

When the above call arrives, if there is no free PLK, memory 3
For the table shown in FIG. 4 which is stored in the table shown in FIG. to control.

From then on, follow the normal camp-on sequence.

Next, the flow when a camped-on call arrives at PLK will be explained using FIG. 2. First, when a telephone with a PLK function (hereinafter referred to as a PLK telephone) ends a call (puts the handset on hook), the C in PBX 1
The PU 2 detects via the line circuits (4-1 to 4-n) and the data highway 6 that the telephone is free (831). Thereby, the CPU 2 checks whether there is a camp-on call corresponding to the PLK group in the camp-on information in the table of FIG. 4 stored in the memory 3. As a result, if there is a camp-on call, the CPU 2, in step 834, sends the trunk circuit (8-1 to 8-8-
Controls the communication path circuit 5 so as to receive a call from (n).

That is, a ringing tone is sent to the telephone that has terminated the call. Thereafter, control is performed according to the normal incoming call sequence. In addition, if another free PLK phone occurs while a ring tone is being sent to the phone that terminated the call, the same camp-on call as the PIJ m jammer that has already received a call will be sent to this empty PLK phone. CPU2 to receive the call
control. Therefore, until the camp-on call is answered, the same camp-on call as the already incoming PLK telephone will be received by all vacant PLK telephones, including the vacant PLK telephones that will occur thereafter.

At 833, in the table of the number of free PLKs shown in FIG. 5 stored in the memory 3, the number of free PLKs in the PLK group corresponding to the PLK that becomes free is increased by "1". Thereafter, control is performed according to the normal call end sequence.

Finally, PLK for incoming calls from camp-on calls.
The flow when responding by pressing will be explained with reference to FIG. 3. In this case, first, the trunk circuit (8-1 to 8-n
When PLK is pressed on a PLK telephone that is sending out a ring tone due to an incoming call from
), the CPU 2 detects this through the line circuit and enters step 842, where the CPU 2 moves to the area corresponding to the PLK group to which the pressed PLK belongs based on the camp-on information shown in FIG. 4 stored in the memory 3. , it is checked whether the number of the trunk circuit receiving the call is stored in the PLK telephone set that was pressed. As a result, when the trunk circuit number is stored, the process proceeds to step S43, where the responded trunk circuit number is deleted from the camp-on information of FIG. 4 stored in the memory 3, and the remaining camp-on information is deleted.・Align the on information to the left.

Therefore, when any PLK telephone in a PLK group becomes free, a camp-on call on another trunk circuit will arrive at that PLK telephone. In step S42, if the trunk circuit number is not stored, the process proceeds to step S43, where the PL to which the pressed PLK belongs regarding the number of free PLKs shown in FIG. 5 stored in the memory 3.
Decrease the contents of the K group corresponding area by "1". Thereafter, the same processing as before is followed.

As a result of the above control, in this embodiment, until the camp-on call is answered, all vacant PLK telephones, including the vacant PLK telephones that will occur thereafter, are
The same camp-on call as the LK telephone will be received.

In this way, in this device, multiple central office lines are associated with one key on a multi-function telephone, and by operating that key, an incoming call from the central office line can be answered. In a telephone system using a private branch exchange (PBX) of a pooled line system, in which each multi-function telephone can be equipped with one, and incoming calls are made to idle telephones among them, The PBX includes a registration means for registering a newly generated incoming call in a table as a waiting state when each of the plurality of multifunction telephones is in use, and a registration means for registering a newly generated incoming call in the table as a waiting state when each of the plurality of multifunction telephones becomes available; The apparatus further comprises a control means for reading out an incoming call in a waiting state and controlling all available multifunction telephones to receive the incoming call until the incoming call is answered. Then, when there is an incoming call from the central office line, the call is received by an empty multi-function telephone equipped with a pooled line key function, which is a function that allows you to answer the incoming call from the central office line by key operation. make a sound. Then, by operating the pooled line key of the multifunction telephone that received the call, the user can answer the call from the central office line. Further, when a new incoming call occurs while all of the multifunction telephones having the relevant key functions are in use, the registration means registers this incoming call in the table as a waiting state, and the multifunction telephone becomes vacant. At this time, the control means reads out the incoming calls registered in the table and controls the incoming calls to be received by all available multifunction telephones until the incoming calls are answered. . Therefore, when all of the multifunction telephones having the relevant key functions are in use, a new incoming call will not be accepted until the multifunction telephone becomes available and the incoming call is answered. Since the incoming call is received by all the telephones, it becomes possible to increase the number of incoming telephones for the camp-on call.

〔Effect of the invention〕

As described in detail above, according to the present invention, in a system using the pooled line method, when there is a camp-on call in progress, other PLKs in the same PLK group
When an LK telephone becomes free, it becomes possible to receive calls to that telephone, and therefore, the number of incoming telephones for camp-on calls is increased, and the number of telephones capable of responding to camp-on calls is increased, thereby increasing the chance of answering the incoming call. We can provide a private telephone system that allows you to

[Brief explanation of the drawing]

Fig. 1 is a process diagram showing the configuration of the device of the present invention, Figs. 2 and 3 are flowcharts for explaining the operation of the device, and Figs. 4 and 5 are used to control camp-on. A diagram showing an example of a table, FIG. 6 is a flowchart showing a control procedure at the time of incoming call, and FIG. 7 is a flowchart showing a conventional camp-on control procedure. 1...Private branch exchange (PBX), 2...Central processing unit (CPU), 3...Memory, 4-1 to 4-n
. . . line circuit, 5 . . . communication path circuit, 6 .
7-1 to 7-n...Multi-function telephones (electronic key telephones, EKT). Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A plurality of office lines are associated with one key of a multifunction telephone, and an incoming call from the office line can be answered by operating the key, and each of the plurality of multifunction telephones is provided with the key function. In a telephone system using a private branch exchange using a central line pooled line system, the incoming call is made to an idle telephone among these telephones, and the private branch exchange has the plurality of multi-function telephones. Registration means for registering a newly generated incoming call in a waiting state in a table when all telephones are in use, and reading out an incoming call registered in the table in a waiting state when the multifunction telephone becomes free. and control means for controlling all available multifunction telephones to receive the incoming call until the incoming call is answered.