JPH04227363A - telephone switching system - Google Patents

Abstract

PURPOSE:To realize the telephone exchange system able to accommodate lots of speech lines (trunks) and improve the reliability and the capability of the call connection processing. CONSTITUTION:Exchanges A(EX-A) and B(EX-B) implementing exchange independently are provided to the system and each of the exchanges A(EX-A) and B(EX-B) accommodates one terminal equipment 8. On the other hand, the terminal equipment 8 is provided with a channel switch to connect a speech circuit including a handset to either the exchange A(EX-A) or B(EX-B). When the processing to connect a call takes place, the terminal equipment 8 selects any of the exchanges and controls the channel switch to connect the selected exchange and the call.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone switching system configured to accommodate a large number of central office line trunks and private line trunks relative to the number of terminal equipment accommodated.

0002

2. Description of the Related Art A conventional telephone exchange system has a configuration shown in FIG.

[0003] In FIG. 61, the telephone exchange system includes a communication path switch (SW) 611. The call path switch 611 accommodates a telephone terminal 612 such as a telephone,
An extension circuit (L) for connecting and controlling the telephone terminal 612
IN) 613 is connected, and a trunk (TRK) 614 for accommodating office lines or private lines and controlling connection of these office lines or private lines is connected.

A central control unit (CC) 615 controls the entire telephone exchange system and performs call control between the telephone terminals 612 and between the telephone terminals 612 and a central office line or dedicated line. The storage device (MM) 616 is connected to the central control device 61
5 stores programs, station data, and various tables for controlling the telephone exchange system, and is connected to the central control unit 615 by a control system bus 617. Note that the control system bus 617 includes a communication path switch 6.
11 is connected, and furthermore, although not shown,
Central control unit 615, extension circuit 613 and trunk 61
4 is logically connected. As a result, the communication path switch 611, the extension circuit 613, and the trunk 61
4 is operating under the control of a central controller 615.

[0005] In such a configuration, in the case of a normal telephone switching system, one of the purposes is to implement the number of trunks commensurate with the call volume. Number of lines accommodated (trunk 614
(accommodated number) m is generally n>m.

[0006]

[Problem to be solved by the invention] However, banks,
A telephone exchange system (also referred to as a dealing call system) that facilitates communication between dealers and customers at financial institutions such as brokers for buying and selling foreign exchange, bonds, etc. (hereinafter referred to as dealing).
In this case, for example, when a foreign exchange price movement occurs, a single dealer needs to instantly select a specific customer from among a large number of customers and communicate with them, regardless of call volume. Accommodates the number of trunks.

Therefore, in the case of a telephone exchange system used for dealing, in FIG. 61, the relationship between the number n of telephone terminals 612 accommodated and the number m of trunks 614 accommodated is n<m.

[0008] In order to accommodate such a large number of trunks, a large-scale telephone exchange system (private telephone exchange) may be used, but in this case, all communications may be cut off due to a failure of the telephone exchange system. The problem arises that there is a great possibility. Furthermore, in the case of a large-scale telephone exchange system, the load on the central control unit increases, resulting in the problem that the time required for call connection increases. These are the biggest challenges for dealing operations, which require time-sensitive and accurate communication between dealers and customers.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a telephone switching system that can accommodate a large number of trunks and improve reliability and call connection processing capabilities.

0010

[Means for Solving the Problems] The present invention provides a telephone switching system in which one terminal device is connected to a plurality of switching devices, in which the terminal device recognizes that a call connection process has occurred. In this case, one switching device is selected from a plurality of switching devices to perform call connection processing.

[0011]

[Operation] Connects one terminal device to multiple exchange devices. Each of the plurality of switching devices operates independently and performs processes such as calling and receiving calls to terminal devices. On the other hand, the terminal device
When it is recognized that a process for connecting a call has occurred, it selects one switching apparatus from a plurality of switching apparatuses, and performs processing for connecting a call with the selected switching apparatus.

[0012] This makes it possible to provide a telephone switching system that can accommodate a large number of trunks and improve reliability and call connection processing capabilities.

[0013]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

§1. System configuration overview

FIG. 1 is a diagram showing an example of the configuration of a telephone switching system according to the present invention.

In FIG. 1, the telephone exchange system includes two sets of exchange equipment (EX-A and EX-B): exchange equipment A (EX-A) and exchange equipment B (EX-B). And those exchange devices (EX-A and EX-B)
are each equipped with a communication path switch (SW) 1A, 1B, and each communication path switch 1A, 1B accommodates a central office line or a private line, and is equipped with a switch for connecting and controlling the central office line or private line. Trunks (TRK) 4A and 4B are connected.

[0017] The terminal device 8 is a terminal device mainly used as a talking table for dealing calls, and has a function of instantly selecting a specific customer from among a large number of customers. . This terminal device 8 has a dedicated extension circuit (DLIN) connected to the communication path switches 1A and 1B.
) 9A and the dedicated line extension circuit 9B. The dedicated extension circuits 9A and 9B are for transmitting and receiving call control messages to and from the terminal device 8, which will be described later.

[0018] Each of the central control units (CC) 5A and 5B has an exchange device A (EX-A) and an exchange device B (EX-A).
B), between the terminal devices 8 and between the terminal devices 8
It performs call control between the network and central office lines or dedicated lines. The storage devices (MM) 6A, 6B are the central control devices 5A, 5B.
stores programs, station data, and various tables for controlling the exchange equipment (EX-A and EX-B), and is connected to the central control units 5A and 5B by respective control system buses 7A and 7B. ing. Note that communication path switches 1A and 1B are connected to the control system buses 7A and 7B, respectively, and furthermore, although not shown, central control units 1A and 1B, dedicated extension circuits 9A and 9B, and a trunk 4A are connected to the control system buses 7A and 7B, respectively. , 4B are logically connected. As a result, the communication path switches 1A, 1B, dedicated extension circuits 9A, 9
B, and the trunks 4A and 4B are each connected to the central control device 5.
It operates under the control of A and 5B.

Furthermore, the central control device 5A and the central control device 5B operate completely independently, that is, the exchange device A (EX-A) and the exchange device B (EX-B) each operate independently. It is a system that works.

As a result, in the telephone switching system having the configuration shown in FIG. 1, a plurality of terminal devices 8 are connected to two sets of switching devices (EX-A and EX-B) via dedicated extension circuits 9A and 9B. each terminal device 8.
is the total of the number of office lines and dedicated lines (m1) accommodated by exchange equipment A (EX-A) and the number (m2) of office lines and dedicated lines accommodated by exchange equipment B (EX-B), i.e. , m1 and m2, it is possible to access the total number of office lines and dedicated lines.

FIG. 2 shows ordinary telephone terminals 2A, 2 conventionally used in the telephone exchange system having the configuration shown in FIG.
B is a diagram illustrating a configuration example where telephone terminals 2A, 2B and a dealing call terminal device 8 coexist. In addition to the terminal device 8 handled by the dealer, the dealing telephone system can accommodate conventional telephone terminals 2A and 2B used by staff backing up dealing operations, making it possible to communicate with each other. There is. Note that the telephone terminals 2A and 2B are connected to the communication path switch 1A,
Connection is controlled by extension circuits (LIN) 3A and 3B connected to 1B, but since this is the same as conventional control, detailed explanation will be omitted.

FIG. 3 shows a configuration example of a telephone switching system configured with three sets of switching equipment: switching equipment A (EX-A), switching equipment B (EX-B), and switching equipment C (EX-C). FIG. This shows that it is possible to configure a large-capacity system by adding switching equipment according to the required number of central office lines and dedicated lines.

An example of the configuration of the telephone exchange system according to the present invention has been shown with reference to FIGS. 1 to 3. An important point in this configuration is that, from the purpose of the system, Users must not consciously operate the switching equipment that accommodates lines and conventional telephone terminals. That is, from the perspective of each terminal device, the plurality of switching devices must function as if they were one set of switching devices. This problem arises because each switching device operates independently in order to maintain the throughput of the switching device.

In the present invention, the terminal device, which can be called a control contact point for each exchange device, is provided with means for selecting the exchange device,
Furthermore, by providing some of the call control functions that should normally be handled by switching equipment, a plurality of switching equipment can be made to appear as if they were a single set of switching equipment.

The description of the embodiments shown in Section 2 and subsequent sections is based on the assumption that the telephone exchange system has the configuration shown in FIG.

§2. Hardware configuration

2.1 Configuration of exchange device

The switching device has the same configuration as described above, but information (call control message) for controlling calls with terminal devices is
The dedicated extension circuit (DLIN) (FIGS. 2, 9A, 9B) that is equipped to perform transmission and reception will now be described in more detail.

[0029] The dedicated extension circuit (DLIN), as an embodiment of increasing the effectiveness of the present invention, is a hardware for connecting a terminal device and a switching device with a digital interface (ISDN basic interface having 2B+D channels). It is clothing.

A detailed explanation will be given below with reference to FIG.

In FIG. 6, the dedicated extension circuit (DLIN)
is a processing processor (
MPU) 9-1, central control unit 5A of the exchange device
, 5B, and also transmits and receives call control messages to and from the terminal device 8. The control procedure or processing method carried out by the processing processor 9-1 is programmed in advance in a fixed storage device (ROM) 9-2, and data such as intermediate progress information is stored in a temporary storage device (RAM) 9-3. At the same time, the process is executed according to the program. It also includes a call control message transmitting/receiving buffer 9-5 for transmitting and receiving call control messages to and from the terminal device 8, and this call control message transmitting/receiving buffer 9-5 includes a transmitting circuit 9-6 and a receiving circuit. 9-7 is connected. The transmitting circuit 9-6 is an ISD which is an interface for connecting with the terminal device 8.
N basic interface signal channel (D channel)
The receiving circuit 9-7 is a circuit that transmits a call control message to the terminal device 8 through the D channel 9-8. Furthermore, the central control unit 1 of the exchange device
An information transmitting/receiving buffer 9-10 for transmitting and receiving control information with A and 1B is provided, and this information transmitting and receiving buffer 9-10 is connected to control system buses 7A and 7B of the switching device. Furthermore, a processing processor 9-1, a fixed storage device 9-2, a temporary storage device 9-3, a call control message transmission/reception buffer 9-5, and an information transmission/reception buffer 9
-10 are connected to a control bus 9-4.

With this configuration, the processing processor 9-1
Control information is transmitted and received between the controller and the central controllers 1A and 1B via the control bus 9-4 and the information transmitting and receiving buffer 9-10, and between the processing processor 9-1 and the terminal device 8.
Transmission and reception of call control messages to and from the terminal is performed via a control bus 9-4 and a call control message transmission/reception buffer 9-5.

Note that the two communication channels, B1 channel 9-9-1 and B2 channel 9-9-2, are connected to the communication path switches 1A and 1 of the switching device without any logical modification.
Connected to B. The B1 channel 9-9-1, the B2 channel 9-9-2, and the D channel 9-8 are actually digitally communicated by time division multiplexing, but for convenience, they are explained here as space division type. There is. Therefore, Figure 6
Then, B1 channel 9-9-1, B2 channel 9-9-
A circuit for time-division multiplexing 2 and D channels 9-8, and a circuit for separating time-division multiplexing are omitted.

2.2 Terminal device configuration

Next, a description will be given of the hardware configuration of the terminal device 8, which is mainly used as a talking stand for dealing calls.

FIG. 4 is a diagram showing the board of the terminal device 8. As shown in FIG. In this embodiment, two telephone handsets 8-
A case in which 1-1 and 8-1-2 are provided will be explained as an example.

In FIG. 4, the left and right handsets 8-1
In addition to -1 and 8-1-2, buttons 'Extension 1' and 8-2-1 correspond to virtual extension circuits (extension memory) and are used to make calls with other terminal devices and conventional telephone terminals. and 'extension 2' 8-2-2 and their buttons 'extension 1' 8-2
-1 and 'Extension 2' Lamp 8-3 corresponding to 8-2-2
-1 and 8-3-2, the buttons 'Trunk 1' 8-4-1 to 'Trunk P' 8-4-p, and the buttons 'Trunk 1' and 8-4-p for making and answering calls to the central office line or private line; Lamps 8-5-1 to 8-5-P corresponding to 1'8-4-1 to 'trunk p'8-4-p, and button 'auto dial 1'8 for automatically calling the other party. -6-
1 to 'auto dial q' 8-6-q and the lamps 8-7-1 to 8 corresponding to those buttons 'auto dial 1' 8-6-1 to 'auto dial q' 8-6-q.
-7-q and dial key group 8 for dialing
-10, a numeric display 8-9 that displays numbers, etc., a button 'left disconnect' 8-8-1 for disconnecting the call on the left handset 8-1-1, and a right handset 8-1-2. button 'Right disconnect' 8-8-2 to disconnect the call and whether to use the left and right handsets, i.e. use one handset (single hand) or use two handsets. (double hand)
'Double Hand' button 8-
11, a lamp 8-12 corresponding to this 'double hand' button 8-11, and an incoming call ringer 8-13 for audibly displaying an incoming call.

FIG. 5 is a block diagram showing the hardware configuration of the terminal device 8 having the board configuration shown in FIG. 4. As shown in FIG.

In FIG. 5, the terminal device 8 includes a call control processor (MPU) 8-14 that controls the entire terminal device, and is connected to a control bus 8-17. The call control processor 8-14 performs control according to a program stored in a fixed memory device (ROM) 8-15 connected to the control bus 8-17. Temporary storage (RAM)
8-16 is connected to the control bus 8-17, and stores various variable data, such as different tables for each delivery station, or temporary data generated while the call control processor 8-14 performs control. information is stored. In this manner, the call control processor 8-14, like other processor systems, is connected to the fixed storage device 8-14 via the control bus 8-17.
15 and temporary storage device 8-16 to perform control.

The control bus 8-17 also includes a call control message transmission/reception buffer 8-18, a numeric display controller 8-25, a lamp driver 8-26, a button scan buffer 8-27, a ringer driver 8-28, and a numeric display controller 8-25. A communication path switch (T-SW) 8-30 is connected. and a call control message transmission/reception buffer 8-18, a numeric display controller 8-25, and a lamp driver 8-26.
, button scan buffer 8-27, ringer driver 8
-28, and the communication path switch (T-SW) 8-30,
All operate under the control of call control processors 8-14.

Call control message transmission/reception buffer 8-18
The exchange device A (EX-A and EX-B) sends and receives call control messages to and from the exchange devices (EX-A and EX-B).
A receiving circuit 8-19 that receives a call control message from EX-A) via the D channel 8-23 of the ISDN basic interface, and a receiving circuit 8-19 that receives a call control message from the switching device A (EX-A) via the D channel 8-23 of the ISDN basic interface. A transmitting circuit 8-20 that transmits a message, a receiving circuit 8-21 that receives a call control message from exchange B (EX-B) via D channel 8-24, and exchange B (EX-B). A transmitting circuit 8-22 for transmitting a call control message via a D channel 8-24 is connected to the transmitting circuit 8-22.

The numeric display controller 8-25 is connected to the numeric display 8-9, and the call control processor 8-25 is connected to the numeric display controller 8-25.
An arbitrary number is displayed on the number display 8-9 based on the control from 14.

[0043] The lamp driver 8-26 is connected to the lamp 8-3.
-1 and 8-3-2, lamps 8-5-1 to 8-5-P
, lamps 8-7-1 to 8-7-q, and lamp 8-
12, and controls the blinking of the lamps to display the status of the button corresponding to each lamp.

The button scan buffer 8-27 stores buttons 'Extension 1' 8-2-1 and 'Extension 2' 8-2-2, buttons 'Trunk 1' 8-4-1 to 'Trunk P' 8-
4-p, button 'Auto dial 1' 8-6-1 to'
Connect auto dial q'8-6-q, button 'double hand' 8-11, button 'left cut' 8-8-1, button 'right cut' 8-8-2, and dial key group 8-10. The system then scans these various buttons to detect whether they are opened or closed.

The ringer driver 8-28 is the incoming ringer 8.
-13 is connected to control the audible display of incoming calls.

The communication path switch 8-30 includes a left communication circuit 8-29-1 to which the left handset 8-1-1 is connected;
Right call circuit 8-2 to which right handset 8-1-2 is connected
9-2 is connected, and exchange equipment A (EX-
B of the ISDN basic interface connected to A)
1 channel 8-31-1 and B2 channel 8-31-2
, and IS connected to exchange equipment B (EX-B)
It accommodates B1 channel 8-32-1 and B2 channel 8-32-2 of the DN basic interface. Each of these four communication channels is connected to the left communication circuit 8-29-1 corresponding to the left handset 8-1-1 by the call control processor 8-14 controlling the switching of the communication path switch 8-30. The configuration is such that it can be connected to any of the right communication circuits 8-29-2 corresponding to the right handset 8-1-2.

[0047] As mentioned above, the B1 channel 8-
31-1, B2 channel 8-31-2, and D channel 8-23, and B1 channel 8-32-1, B2 channel 8-32-2, and D channel 8-24 are actually time-division Digital communication is performed by multiplexing, but for convenience, the space division type is explained here. Therefore, in FIG. 5, a circuit for time-division multiplexing the B1 channel, B2 channel, and D channel, and a circuit for separating the time-division multiplexing are omitted.

[0048] Furthermore, in the case of a system configuration such as that of this embodiment, that is, a terminal device having two handsets has two handsets.
When connected to a set of switching equipment, the left handset is connected on the B1 channel of the respective switching equipment,
Preferably, the right handsets are controlled to be connected on the B2 channel of the respective switching device. When controlling in this way, a terminal device with one handset requires only the B1 channel, and a terminal device with three handsets requires three communication channels: B1 channel, B2 channel, and B3 channel. Become.

Furthermore, if there are three or more sets on the switching device side, this can be handled easily and flexibly by adding pairs of B1 channels and B2 channels.

§3. Table and temporary memory configuration

0
[051] The operation of call control will be explained from Section 5 onward. Prior to that, this section will explain the tables and temporary memory used to execute call control, and the next section will explain the operation of switching equipment and terminal equipment. This section explains the call control messages sent and received between the two.

3.1 Terminal device table and temporary memory

The table and temporary memory of the terminal device 8 are as follows:
It is stored in the temporary storage device 8-16 shown in FIG.

[0054] The table is registered in advance according to the operating conditions of the terminal device 8, is backed up by a battery, etc., and is configured so that it will not disappear due to a power outage, etc., and corresponds to so-called station data. This is a table where It is clear that this table can be changed at any time if the operating conditions of the telephone exchange system change. Further, tables used in this embodiment are shown in FIGS. 7 to 13.

[0055] The temporary memory is a memory that stores information that changes from time to time during the process of performing call control. In addition,
The temporary memory used in this embodiment is shown in FIGS. 14 to 20.

First, the table will be explained.

FIG. 7 is a diagram showing the trunk button table. In FIG. 7, the trunk button table includes the button 'trunk 1' 8 on the board diagram of the terminal device 8 shown in FIG.
-4-1 to 'trunk p' This is a table provided corresponding to 8-4-p, and includes information (switching device number) 701 indicating the switching device to be connected, information indicating the storage position of the trunk (trunk storage position number or trunk number)
702, information indicating the type of ringing tone at the time of incoming call (ringing tone type) 703, and information indicating the priority of capturing when making a call from the trunk by auto dialing (capture priority) 704 are registered. In this table, arbitrary p trunks are registered among m1 trunks accommodated in exchange device A (EX-A) and m2 trunks accommodated in exchange device B (EX-B). can do.

FIG. 8 is a diagram showing an auto-dial button table. In FIG. 8, the auto dial button table includes buttons 'auto dial 1' 8-6-1 to 'auto dial q' on the board diagram of the terminal device 8 shown in FIG.
It is a table provided corresponding to 8-6-q,
Information indicating whether the call is made to a trunk or an extension (
Auto-dial type) 801 and information (dial number) 802 indicating the dial of the destination are registered.

FIG. 9 is a terminal number table. In this terminal number table, the terminal number 901 of the terminal device itself is registered, and when terminal state change information indicating that the state of the terminal has changed sent from the switching device is received, the terminal state change information This is used to determine whether the information is generated in response to a change in the state of the own terminal device or in response to a change in the state of another terminal device.

FIG. 10 is a handset mode table. Information (handset mode) indicating whether the user of the terminal device is right-handed or left-handed is registered in this handset mode table. Generally, right-handed users hold the handset with their left hand and operate buttons, etc. with their right hand, and left-handed users do the opposite. Therefore, this table determines the priority order of the left and right handsets.

FIG. 11 is a calling switching equipment number table. In this calling exchange equipment number table, when a call is made using the button 'Extension 1' 8-2-1 or 'Extension 2' 8-2-2 on the panel diagram of the terminal device 8 shown in FIG. EX
- Information (exchange device number) 110 indicating which exchange device to make a call to, A) A or exchange device (EX-B) or B.
1 is registered. Note that when making a call to the terminal device 8 for dealing calls, it is clear that the call should be made to either exchange device. However, if, for example, conventional telephone terminals (2A, 2B) are housed separately in switching equipment A and switching equipment B as shown in FIG. (
Although it is necessary to identify the switching device (extension number) and select the switching device, detailed explanation will be omitted in this embodiment.

FIG. 12 is a left hand continuous mode table. This left hand continuous mode table includes, for example,
If you are talking to the line corresponding to button 'Trunk 1' 8-4-1 on the left handset and press button 'Trunk 2' 8-4-2, 'Trunk 1' 8-
Disconnect the line corresponding to 4-1 and connect 'trunk 2' to 8-4.
Information (continuous mode) 1201 indicating whether or not to allow the operation of connecting to the line corresponding to -2 is registered.

FIG. 13 is a right hand continuous mode table. This right hand continuous mode table includes continuous mode 1 as well as the left hand continuous mode table shown in FIG.
301 is registered. Regarding this control,
This will be explained in detail in Section 5, Handset Selection Control.

Next, temporary memory will be explained.

FIG. 14 shows the left (L) handset memory. In FIG. 14, the left (L) handset memory includes information (status type) 1401 indicating the state of the left communication circuit 8-29-1, information 1402 indicating the switching equipment in use (calling switching equipment number), Information indicating the button of the trunk inside the phone (trunk button number) or information indicating the button of the extension being called (extension button number) 1403, and information indicating the auto-dial button when an auto-dial call is made (auto-dial button). number) 1404 is held, and call control is executed based on this information mainly when a disconnection operation is performed.

FIG. 15 shows the right (R) handset memory. In FIG. 15, the right (R) handset memory, like the left (L) handset memory in FIG.
501, information indicating the switching device during the call (calling switching device number) 1502, information indicating the button of the trunk during the call (trunk button number) or information indicating the button of the extension during the call (extension button number) 1503; And when an auto-dial call is made, information (auto-dial button number) 1504 indicating the auto-dial button is held.

FIG. 16 shows an extension call control memory (extension memory 1) for controlling the call of the extension corresponding to the button 'Extension 1' 8-2-1. In FIG. 16, the extension memory 1 includes information (state type) 1601 indicating the connection state of button 'Extension 1' 8-2-1, information (switching device number) 1602 indicating the switching device that accepted the incoming extension call, and information indicating the calling party's extension number (calling extension number) 1603. The extension number is used to display the extension number of the other party on the numeric display 8-9 during extension call control.

FIG. 17 shows an extension call control memory (extension memory 2) for controlling the call of the extension corresponding to the button 'Extension 2' 8-2-2. In FIG. 17, the extension memory 2, like the extension memory 1, has a button 'Extension 2' 8-
2-2 connection status information (status type) 1701;
It holds information (exchange equipment number) 1702 indicating the switching equipment that accepted the incoming extension call, and information (calling extension number) 1703 indicating the extension number of the calling party.

Here, the extension memory 1 and the extension memory 2 are connected to both the left and right handsets, switching device A, and switching device B.
It is desirable that there be no restrictions on connection between the This means that the left handset 8-1-1 has a button 'extension 1'-exchange device A (EX-A), a button 'extension 1'-exchange device B
(EX-B), Button 'Extension 2' - Exchange device A (EX-
A), and button 'Extension 2' - Exchange device B (EX-B)
4 ways of connection are possible, and the right handset 8
-1-2 can similarly be connected in four ways. This means that in a telephone switching system configured using multiple switching devices that operate independently of each other, when making and receiving extension calls, the multiple switching devices appear to be one from the operator's perspective.
This is an important point in order to function like a stand-alone exchange device.

FIG. 18 shows a trunk memory accommodating switching equipment A. This trunk memory accommodating exchange device A holds information (state type) 1801 indicating the status of all trunks (for m1 trunks) accommodated by exchange device A (EX-A).

FIG. 19 shows a trunk memory accommodating switching device B. This switching device B accommodation trunk memory holds information (state type) 1901 indicating the status of all trunks (m2 trunks) accommodated by switching device B (EX-B).

[0072] By equipping the terminal device 8 with these switching device A accommodating trunk memory and switching device B accommodating trunk memory, the terminal device 8 can store the trunks (m1+m2 total trunks) accommodated by the switching device. The state of the terminal device 8 can be recognized, and part of the call control for trunk originating and terminating calls is shared by the terminal device 8 side.

FIG. 20 shows a double hand button memory. The content of this double hand button memory changes in conjunction with the operation of buttons 'double hand' 8-11, and contains information indicating whether the terminal device is in a single hand state or a double hand state (state type )2001.

3.2 Switching device tables and temporary memory

The tables and temporary memories of the exchange devices (EX-A and EX-B) are stored in storage devices 6A and 6B, respectively, in FIG.

The tables and temporary memory on the switching equipment side include various station data, subscriber data, various memories for call control, other maintenance and operation data, billing data, etc. Disclosure only regarding tables and temporary memory.

First, the table will be explained.

FIG. 21 is a terminal number table. This terminal number table is allocated for each terminal device, and is used to notify which terminal device the change in status has been received when an extension call is made or when the status of the terminal device changes. The information (terminal number) 2101 necessary for the terminal is stored. Note that this terminal number table is provided in exactly the same configuration for all of the plurality of switching devices (switching device A and switching device B).

Next, temporary memory will be explained.

Temporary memories used in this embodiment are shown in FIGS. 22 to 25.

FIG. 22 shows the extension memory 1. This extension memory 1 contains buttons 'extension 1' 8-2- for each terminal device 8.
Information (status type) 2201 indicating the status of 'extension 1', information (handset type) indicating the type of connected handset (from the switching device, B1 channel or B2 channel)
2202, and information (recipient side accommodation position number) 2203 indicating the accommodation position of the other party's terminal device during an extension call.

FIG. 23 shows the extension memory 2. Similar to the extension memory 1, this extension memory 2 is provided corresponding to the button 'Extension 2' 8-2-2 of each terminal device 8.
Information indicating the status of 'extension 2' (status type) 2301
, information indicating the type of connected handset (handset type) 2302, and information indicating the accommodation location of the other party's terminal device during an extension call (other party accommodation location number) 2303.

FIG. 24 shows the terminal memory. This terminal memory is provided corresponding to the B1 channel (L) and B2 channel (R), which are two call channels for each terminal device, and contains information ( connection type) 2401, information indicating the accommodation location of the trunk being connected or information indicating the extension memory (trunk accommodation location number/extension memory number) 2402, and information indicating the number dialed by the terminal device (reception dial number) 2403. keeping.

FIG. 25 shows the trunk memory. This trunk memory holds information (state type) 2501 indicating the state of the trunk accommodated in each switching device.

[0085] The information held in this trunk memory is always transmitted to all terminal devices in a call control message, and is copied to the trunk memory on the terminal device 8 side shown in FIGS. 18 and 19. It is something that

§4. call control message

The communication protocol between the switching device and the terminal device in this embodiment conforms to the ISDN basic interface recommended by CCITT. However, the content of layer 3, that is, the call control message, has the configuration described below.

[0088] Each call control message described below is transmitted on the D channel.

4.1 Call control message from terminal equipment to switching equipment

Call control messages sent from the terminal device to the switching device are shown in FIGS. 26 to 31.

[0091] At the beginning of each call control message,
An identifier is given for the receiving side to identify the information.

FIG. 26 shows a call control message (call information) transmitted when a terminal device makes a call, and the identifier is a call information identifier 2601. This call information includes information (call type) 2602 indicating the type of call such as trunk call, extension call, auto-dial trunk call, and auto-dial extension call, and the left or right handset that made the call. Information indicating the type (handset type) 26
03. Information indicating the accommodation location of the called destination's trunk or information indicating the extension memory used for making the call (trunk accommodation location number/extension memory number) 2604, and information indicating the dial number when the call was made by auto dialing. (Dial number) 2605 is included.

FIG. 27 shows a call control message (response information) sent when a terminal device responds to an incoming call, and the identifier is a response information identifier 2701. This response information includes information indicating whether it is a trunk response or an extension response (response type) 2702, information indicating the type of the left or right handset that responded (handset type) 2703, and information indicating the accommodation position of the responding trunk or response. Information (trunk accommodation position number/extension memory number) 2704 indicating the extension memory used for the storage is included.

FIG. 28 shows a call control message (dial button information) transmitted when a dial button is pressed, and the identifier is a dial button information identifier 2801. This dial button information includes information indicating the type of left or right handset (handset type)2.
802, and information (dial code) 2803 indicating the dial type of "1" to "0", "*", and "#".

FIG. 29 shows a call control message (disconnection information) that is sent when disconnecting a line during a call, and the identifier is a disconnection information identifier 2901. This disconnect information includes a button for disconnecting the left handset side.
Information (handset type) 2902 is included indicating whether the left disconnect '8-8-1 was pressed or the button 'right disconnect' 8-8-2 for disconnecting the right handset side was pressed.

FIG. 30 shows the extension call information (FIG. 33) of the call control message received from the switching equipment (details will be described later).
This is a call control message (extension call completion information) that is sent when an incoming call is possible for the user, and the identifier is an extension call completion information identifier 3001. The extension call completion information includes information (extension memory number) 3002 indicating the extension memory that was able to receive the call, and extension call information from the switching device (Figure 3
Information indicating the caller's accommodation location notified by 3) (
Caller accommodation location number) 3003 is included.

FIG. 31 shows a call control message (extension call completion information) that is sent when the call cannot be received in response to the extension call information (FIG. 33) of the call control message received from the switching device. , the identifier is extension call incomplete information identifier 3
It is 101. This extension call incomplete information is the information (caller accommodation location number) 3 indicating the caller's accommodation location notified by the extension call information (Figure 33) from the switching device.
102 is included.

4.2 Call control message from switching equipment to terminal equipment

Call control messages sent from the switching device to the terminal device are shown in FIGS. 32 and 33.

FIG. 32 shows a call control message (status information) for notifying the terminal device every time a change in status occurs on the switching equipment side, and the identifier is status information identifier 3.
It is 201. This status information includes trunk empty,
Information (status type) 3202 indicating the contents of changes in status such as trunk call, trunk call arrival, extension idle, and extension call;
Information indicating the type of left or right handset (handset type) 3203, information indicating the storage position of the trunk whose status has changed or information indicating the extension memory whose status has changed (trunk housing position number/extension memory number) 3204
, and information (terminal number) 3205 for notifying the terminal device that accepted the call or call response when there is a call or call response from a plurality of terminal devices.

[0101] Among the state changes that occur in the switching equipment, an incoming extension call requires call control different from other state changes, so a unique call control message is generated.

FIG. 33 shows a call control message (extension call information) transmitted when an extension call is received, and the identifier is an extension call information identifier 3301. This extension call information includes information indicating the accommodation location of the extension calling side (caller accommodation location number) 3302, and information indicating the extension number of the calling side terminal device (caller extension number) 3303. It will be done.

[0103] The switching device transmits this extension call information to the terminal device, and the terminal device receives either extension call completion information (FIG. 30) or extension call completion information (FIG. 30), which is the response information.
After receiving either of the information shown in FIG. 31), call control is performed. This is because the terminal equipment has the right to decide on call control (connection or restriction) in this case, and as a result, even if multiple exchanges receive the same extension call to the same terminal equipment, Call control can be executed without contradiction.

[0104]§5. handset selection control

[0105]
Next, a procedure for selecting the left and right handsets when a call is made or an incoming call is answered at the terminal device will be described.

The terminal device for dealing calls in this embodiment does not have a hook switch unlike conventional telephone terminals. This is because it is generally faster to operate the handset in the work area on the desk than in a fixed position on the terminal panel. This is because it is suitable for things that require movement.

[0107] Therefore, to make a call, press the button 'Trunk 1' 8.
-4-1 to 'Trunk p' 8-4-p, buttons 'Extension 1' 8-2-1 or 'Extension 2' 8-2-2, and buttons 'Auto dial 1' 8-6-1 to' Disconnection occurs when any button on the auto dial q'8-6-q is pressed, and the disconnection occurs when the buttons 'Left disconnect' 8-8-1 and '
Right disconnect occurs when pressing 8-8-2 for the handset corresponding to the respective button.

[0108] Here, it is necessary to establish a rule in advance as to which of the left and right handsets should be connected when a call is made or an incoming call is answered.

FIGS. 34 and 35 are flowcharts illustrating the handset selection method in this embodiment, which is programmed into the fixed storage device 8-15 of the terminal device.

[0110] This selection method will be explained below based on FIGS. 34 and 35.

[0111] First, the operator of the terminal device presses the buttons 'trunk 1' 8-4-1 to 'trunk p' 8-4-p, the button 'extension 1' 8-2-1 or 'extension 2' 8-2. -2 and any of the buttons 'Autodial 1'8-6-1 to 'Autodialq'8-6-q, the call control processor 8-14 of the terminal device detects this. (Step 3400), and determines whether the user is right-handed or left-handed by referring to the handset mode table shown in FIG. 10 (Step 3401). Here, if you are right-handed, step 3402 to step 3414 are executed sequentially, and if you are left-handed, step 3415 to step 3427 are executed sequentially. Since the flow is controlled symmetrically, only the case of a right-handed person will be explained here.

[0112] Next, the call control processor 8-14 operates as shown in FIG.
Referring to the double hand button memory shown in 0, determine whether the current single hand mode is double hand mode (
Step 3402), since only the left handset 8-1-1 can be used in the single hand mode, the left (L) handset memory shown in FIG. Determine (step 3403
). Here, if the handset is empty, the left handset is selected (step 3404), and if the handset is busy, the left handset is selected (step 3404).
Referring to the left hand continuous mode table shown in FIG. 2, it is determined whether the left hand continuous mode table is allowed (step 3405). As a result of this determination, if it is acceptable, the call currently in progress on the left handset is automatically disconnected, and a new call is made or an incoming call is answered using the left handset (step 3406). Also,
If continuation is prohibited, the pressed button is invalidated (step 3407).

On the other hand, if the result of the determination in step 3402 is that the handset is in double hand mode, the left (L) handset memory shown in FIG. (step 3408). If the handset is empty, the left handset is selected (step 3409), and if the handset is busy, the right (R) handset memory shown in FIG. (Step 3410). As a result of this determination, if the handset is empty, the right handset is selected (step 3411), and if the handset is busy,
With reference to the right hand continuous mode table shown in FIG.
It is determined whether continuity is allowed (step 3412). If the result of this determination is that it is acceptable, the call currently in progress on the right handset is automatically disconnected, and a new call is made or received on the right handset (step 3413);
Furthermore, if the continuation is prohibited, the pressed button is invalidated (step 3414).

[0114] The procedure for selecting the left and right handsets has been explained above, but in the detailed explanation of call control that follows,
It is assumed that the left and right handsets are selected in this procedure.

0115]§6. call control

FIGS. 36 to 41 are diagrams showing sequences regarding call control.

FIGS. 42 to 50 are flowcharts illustrating call control of the terminal device, and FIGS. 51 to 6
0 is a flowchart illustrating call control of a switching device.

[0118] Hereinafter, in this embodiment, trunk calls (Fig. 3
6), Incoming trunk call (Figure 37), Outgoing extension call (Figure 38),
Figures 42 to 50 and Figures 51 to 6 for extension calls (Figure 39), auto-dial trunk calls (Figure 40), and auto-dial extension calls (Figure 41), respectively.
0 will be explained in association with the flowchart.

6.1 Trunk call

In FIG. 36, the operator of the terminal device presses the buttons 'trunk 1' 8-4-1 to 'trunk p' 8-4.
-Press any button of p (Figure 36, 3601)
, the call control processor 8-14 of the terminal device recognizes that some event has occurred as shown in FIG. 42 (step 4201), and analyzes the content (step 4202).
. As a result, when it is detected that any one of the buttons 'trunk 1' 8-4-1 to 'trunk p' 8-4-p has been pressed (FIG. 36, 3602), the trunk button detection shown in FIG. Execute processing.

In FIG. 43, first, with reference to the trunk button table shown in FIG. 7, the trunk accommodation position number 702 and the accommodation exchange device number 701 are extracted from the table corresponding to the pressed button (step 4301). )
In addition, the state of the corresponding trunk is determined by the trunk memory shown in FIG. 18 or 19 (step 430).
2). As a result of this determination, if it is empty, the empty route (43-2
) executes trunk call processing.

First, in the procedure shown in FIGS. 34 and 35, call information (see FIG. 26
) (step 4303), and sends the call information (3603 in FIG. 36) to the switching equipment extracted from the trunk button table shown in FIG. 7 (step 43).
04). Next, the area of the corresponding trunk in the trunk memory shown in FIG. 18 or 19 is set to reserved (step 4305), and the state becomes busy in the left handset memory in FIG. 14 or the right handset memory in FIG. 15. and the active exchange number and button 'Trunk 1'.
The pressed trunk button number from 8-4-1 to 'trunk p' 8-4-p is set (step 4306
). Also, based on the handset memory of FIG. 14 or 15, the communication path switch 8-30 is controlled to close the communication path (step 4307).

On the other hand, the exchange device detects that some event has occurred through the process shown in FIG. 51 (step 5101), and analyzes the contents (step 51).
102), call information from the terminal device (Fig. 36, 3603)
When it recognizes that it has received (FIG. 36, 3604), it executes the call information reception process shown in FIGS. 54 and 55.

[0124] First, the switching device receives call information (Fig. 36, 3
603) is determined (step 5).
401), recognizes that it is a trunk call and executes trunk call processing using the trunk call route (54-1).

First, the status of the relevant trunk is determined by the trunk memory shown in FIG. 25 (step 5402), and if the trunk is not empty, a call cannot be made, so the terminal device that is compatible with the handset mode of the terminal device that sent the call information is Sends a busy tone (BT tone) to the storage position. In addition, if the trunk is empty, the handset type, trunk storage position number,
and the calling terminal number, and edit the status information (3607 in FIG. 36) indicating that it is a trunk call (Step 5
403), status information for all terminal devices (Fig. 36,
3607) is sent (step 5404). (Figure 36
In the above, the symbol ALL means to send to all terminal devices. ) Next, the corresponding area of the trunk memory shown in FIG. 25 is set to call status (step 5405), and the corresponding handset area of the terminal memory shown in FIG. Set the position number (step 540)
6). Next, the communication path switch 1A or 1B is controlled to close a communication path between the handset-compatible terminal housing position and the trunk housing position (step 5407), and a calling order is sent to the trunk. Activate the line (step 5408).

[0126] Through the call control described above, the operator of the terminal device can hear the dial tone (DT tone) from the line using the handset.

[0127] Furthermore, by the processing in FIG. 42, the status information (
36, 3607), all terminal devices that have recognized that they have received the status information reception process shown in FIGS. 49 and 50.

[0128] First, the received status information (Fig. 36, 360
7) Determine the state type included in (step 4901)
, executes trunk call processing for the trunk call route (49-1). It is determined whether the trunk is registered in the trunk button table shown in FIG. 7 (step 4902).
), this state information is ignored if it is not registered. If it is registered, the terminal number included in this status information is compared with the own terminal number shown in FIG. 9 (step 4).
903). If they match, it is determined that the status information is the result of a call made by the own terminal device, and the handset type included in the status information is determined (step 4904).
), if it is a left handset, one of the lamps 8-5-1 to 8-5-p corresponding to the buttons 'trunk 1' 8-4-1 to 'trunk p' 8-4-p shown in FIG. The corresponding lamp lights up in green (step 4905), and if it is the right handset, lights up in orange (step 4906).
. This allows the operator to recognize at a glance which of the left and right handsets is being used and which button is being used to make a call.

On the other hand, if the terminal number included in the status information is another terminal number, press the button 'Trunk 1' 8-4.
Lamp 8 corresponding to -1 to 'trunk p'8-4-p
-5-1 to 8-5-p are turned on in red (step 4907) to indicate that another terminal is in use.

[0130] Next, since this route also passes during an incoming call response, which will be described later, processing is performed to stop the incoming call ringer (step 4908). Note that if there is another button that indicates an incoming call and the incoming call is ringing, the ringing will continue. Finally, Figure 1
8 or the corresponding area of the trunk memory shown in FIG. 19 to indicate that the call is in progress (step 4909), and the process ends.

Next, while listening to the DT tone, the operator dials the required digits using the dial button group 8-10 shown in FIG. 4 (3610 in FIG. 36). Then, the call control processor 8-14 of the terminal device identifies this by the process shown in FIG. 42 (FIG. 36, 3611), and executes the dial button detection process shown in FIG. In this dial button detection process, dial button information including the handset type and dial number is edited (step 4601), and the handset memory (FIG. 14 or 15) determined according to the handset selection procedure shown in FIGS. 34 and 35 is edited. This dial button information (FIG. 36, 3612) is sent to the exchange device held (step 460).
2). The call control processor 8-14 also transmits the dialed digits to the digit display controller 8-25,
Sequentially displayed on number display 8-9 (step 4603)
.

On the other hand, when the exchange device recognizes that the dial button information (FIG. 36, 3612) has been received as shown in FIG. 51 (FIG. 36, 3613), it executes the dial button information reception process shown in FIG. 59.

First, the connection type is determined by referring to the handset compatible terminal memory shown in FIG. 24 (step 59).
01). Since this is a trunk connection, the trunk connection process is executed in the trunk connection route (59-1), and a dialing order is sent to the trunk held in the terminal memory shown in FIG. 24 (step 59-1). 590
2). Thereafter, the trunk finishes sending out the necessary digits (3614 in FIG. 36), and if the other subscriber responds, the call state is established (3615 in FIG. 36).

[0134] When the call is terminated, the handler must press the corresponding disconnect button on the handset where he wishes to disconnect the call, ie the button 'Left disconnect' 8-8-1 or 'Right disconnect' 8-8- in FIG.
2 (Figure 36, 3616). Then, the call control processor 8-14 detects this according to FIG. 42 (FIG. 36, 3617), and executes the disconnect button detection process shown in FIG. 47.

First, disconnection information including the handset type (
36, 3618) (step 4701) and sent to the exchange device held in the handset memory shown in FIG. 14 or 15 (step 4702). Next, the communication path switch 8-30 is controlled to open the communication path with the exchange device that sent the disconnection information (step 47).
04), sets the corresponding area of the handset memory to be empty (step 4705), and ends the process.

On the other hand, when the switching device recognizes that it has received the disconnection information (3618 in FIG. 36) according to FIG.
36, 3619), the disconnection information receiving process shown in FIG. 60 is executed.

First, with reference to the terminal memory shown in FIG. 24, the connection type of the corresponding handset is determined (step 6001). Here, since it is a trunk connection, the trunk connection route (60-1) is selected, and the trunk connection process is executed.

First, the trunk accommodation position number held in the terminal memory shown in FIG. 24 is extracted (step 600).
2) Edit the status information (Figure 36, 3621) indicating that the trunk is empty including the trunk accommodation position number (step 6003), and edit the edited status information (Figure 36).
, 3621) to all terminal devices (step 600
4). Next, the corresponding area of the trunk memory shown in FIG. 25 is set to empty (step 6005), and the communication path switches 1A and 1B are controlled to establish a communication path between the terminal accommodation position corresponding to the handset and the trunk accommodation position. is released (step 6006). Next, a disconnection order is sent to the trunk (step 6007), the line is released (FIGS. 36 and 3620), and the corresponding area of the terminal memory shown in FIG. 24 is set to be empty (step 6008).
, ends the process.

Further, as shown in FIG. 42, all the terminal devices that have detected that they have received the status information (3621 in FIG. 36) from the exchange device execute the status information reception process shown in FIGS. 49 and 50.

First, the status type included in the received status information is determined (step 4901). Here, the empty trunk route (49-2) is selected and the empty trunk process is executed.

In this trunk empty processing, first, it is determined whether the corresponding trunk is registered in the trunk button table shown in FIG. 7 (step 4910), and if it is not registered, this information is ignored. When registered,
The corresponding trunk lamp among the lamps 8-5-1 to 8-5-p shown in FIG. 4 is turned off (step 4911).
, the corresponding area in the trunk memory shown in FIG. 18 or 19 is set to be empty (step 4912), and the process ends.

As described above, a series of call controls are performed for trunk calls.

6.2 Trunk call arrival

In FIG. 37, an incoming call occurs from the line to the switching device, and when the switching device detects the incoming call according to FIG. 51 (FIG. 37, 3701), it executes the trunk call incoming detection process shown in FIG. 52.

[0145] First, the switching equipment edits the status information (3702 in FIG. 37), which includes the accommodation position of the incoming trunk and indicates that the call is an incoming trunk call (step 5201).
), the status information (FIG. 37, 3702) is sent to all terminal devices (step 5202), and the corresponding area of the trunk memory shown in FIG. 25 is set to incoming call (step 5203).

On the other hand, when the terminal device recognizes that it has received status information (FIG. 37, 3702) from the switching device according to FIG. 42 (FIG. 37, 3703), it executes the status information reception process shown in FIGS. 49 and 50. do.

[0147] First, the terminal device determines the status type included in the received status information (step 4901). Here, the trunk call arrival route (49-3) is selected and trunk call processing is executed.

In this trunk call incoming process, first, it is determined whether the corresponding trunk is registered in the trunk button table shown in FIG. 7 (step 4913), and if it is not registered, this status information is ignored. When registered, the lamps 8-5- corresponding to the buttons 'trunk 1' 8-4-1 to 'trunk p' 8-4-p shown in FIG.
The corresponding lamp from 1 to 8-5-p is displayed blinking in red (step 4914), and the ringer is sounded according to the ring tone type registered in the trunk button table of FIG. 7 (step 4915). Next, Figure 18 or Figure 1
Information indicating that a call is incoming is set in the corresponding area of the trunk memory shown in 9 (step 4916), and a response from the operator is awaited.

[0149] The operator of one of the terminal devices turns on the lamp 8-
The button corresponding to the red flashing lamp from 5-1 to 8-5-p (button 'Trunk 1' 8-4-
1 to 'trunk p' 8-4-p) (FIG. 37, 3706), the call control processor 8-14
According to Fig. 42, it is detected that the incoming call has been answered (Fig. 37
, 3707), executes the trunk button detection process shown in FIG.

[0150] In this trunk button detection process, first,
With reference to the trunk button table shown in FIG. 7, the trunk storage position is determined from the table corresponding to the pressed button (any of buttons 'Trunk 1' 8-4-1 to 'Trunk p' 8-4-p). , the exchange equipment number in which the trunk is accommodated is extracted (step 4301), and based on this, the state of the corresponding trunk is determined from the trunk memory shown in FIG. 18 or 19 (step 4302).
. Here, since the call is incoming, the incoming call route (43-3
) is selected and executes trunk response processing.

[0151] In this trunk response processing, first, response information (3708 in FIG. 37), which includes information on the selected handset type and indicates that a trunk response will be made, is edited (step 4308), and then the response information is edited from the trunk button table shown in FIG. The response information (3708 in FIG. 37) is sent to the switching device corresponding to the extracted switching device number (step 4309). Subsequently, the handset memory shown in FIG. 14 or 15 shows that the status has become a call, the number of the exchange device in use, and the pressed button numbers (buttons 'trunk 1' 8-4-1 to 'trunk p'). '8-4-p) (step 4306), and also controls the call path switch 8-30 based on the handset memory shown in FIG. 14 or 15 to close the call path (step 4306). Step 4307).

On the other hand, when the switching device detects that the response information (FIG. 37, 3708) has been received from the terminal device as shown in FIG. 51 (FIG. 37, 3709), it executes the response information receiving process shown in FIG. In this response information reception process,
First, the response type included in the received response information is determined (step 5801). Here, since it is a trunk response, the trunk response route (58-1) is selected and trunk response processing is executed.

[0153] In this trunk response processing, first,
The state of the relevant trunk is determined from the trunk memory indicated in (step 5802), and if the call is not incoming,
Since the incoming call cannot be answered, a busy tone (BT tone) is sent to the terminal housing position corresponding to the handset (step 580
9). If the trunk is receiving a call, edit the status information (3712 in FIG. 37) indicating the trunk call, including the handset type, trunk storage location number, and answering terminal number (step 5803), and send it to all terminal devices. and sends out its status information (FIG. 37, 3712) (step 580).
4). Next, the corresponding area of the trunk memory shown in FIG. 25 is set to be in a call (step 5805), and the area corresponding to the handset of the terminal memory shown in FIG.
The fact that it is a trunk connection and the accommodation position number of the trunk are set (step 5806). Next, the communication path switches 1A and 1B are controlled to close a communication path between the terminal accommodation position corresponding to the handset and the trunk accommodation position (step 5807), and a response order is sent to the trunk (
Step 5808) Answer the line.

[0154] Also, according to FIG. 42, the terminal device detects that the status information (FIG. 37, 3712) has been received from the exchange device (FIG. 37, 3713), and performs the status information receiving process shown in FIGS. 49 and 50. Execute.

[0155] First, the terminal device determines the status type included in the received status information (step 4901). Here, the trunk call route (49-1) is selected and trunk call processing is executed.

In this trunk call processing, first, it is determined whether the trunk is registered in the trunk button table shown in FIG. 7 (step 4902), and if it is not registered, this status information is ignored. If it is registered, the terminal number included in this status information is compared with the own terminal number shown in FIG. 9 (step 4903). If they match, it is determined that the status information is the result of the response from the own terminal device, and the handset type included in the status information is determined (step 4904). If it is the left handset, the status information is shown in FIG. 4. Lamps 8-5- corresponding to buttons 'trunk 1' 8-4-1 to 'trunk p' 8-4-p
The corresponding lamp of 1 to 8-5-p is lit in green (step 4905), and if it is a right handset, it is lit in orange (step 4906). This allows the operator to recognize at a glance which of the left and right handsets is being used and which button is being used to make a call.

On the other hand, if the terminal number included in the status information is another terminal number, press the button 'Trunk 1' 8-4.
Lamp 8 corresponding to -1 to 'trunk p'8-4-p
-5-1 to 8-5-p are turned on in red (step 4907) to indicate that another terminal is in use. Next, processing is performed to stop the incoming ringer (step 4908). Note that if there is another button that indicates an incoming call and the incoming call is ringing, the ringing will continue. Finally, Figure 1
8 or the corresponding area of the trunk memory shown in FIG. 19 to indicate that the call is in progress (step 4909), and the process ends.

[0158] Through the above call control, the operator of the terminal device who has performed the response operation enters into a conversation state with the calling subscriber through the selected handset (3715 in Fig. 37).

[0159] When the call is terminated, the handler must press the corresponding disconnect button on the handset where he wishes to disconnect the call, ie the button 'Left disconnect' 8-8-1 or 'Right disconnect' 8-8- in FIG.
2 is pressed to perform a disconnection operation, but the subsequent process is call control similar to the disconnection process in the case of a trunk call shown in FIG. 36, so the explanation will be omitted.

0160]6.3　Extension call

In FIG. 38, when the operator of the terminal presses the button 'Extension 1' 8-2-1 or 'Extension 2' 8-2-2 (FIG. 38, 3801), the call control processor of the terminal is detected by Fig. 42 (Fig. 38, 3
802), the extension button detection process shown in FIG. 44 is executed.

[0162] First, the pressed button (button 'Extension 1'
8-2-1 or 'Extension 2' (8-2-2)) (either extension memory 1 shown in FIG. 16 or extension memory 2 shown in FIG. 17), determine the extension status. (Step 4401). Here, if the status is empty, the empty route (44-2) is selected and the extension calling process is executed.

[0163] In this extension call processing, first, the call information (3803 in FIG. 38), which includes the selected handset information and the extension memory number and indicates that the call is an extension call, is edited (step 4402). Referring to the calling exchange equipment number table shown in FIG. 38, the calling exchange equipment number table shown in FIG.
803) is sent (step 4403). Next, Figure 1
6 or the pressed button shown in Figure 17 (button 'ext. 1
Either '8-2-1 or 'Extension 2'8-2-2)
The extension memory corresponding to is set to reserved (step 44).
04), the handset memory shown in FIG. 14 or 15 is set to indicate that the status is in a call, the switching equipment number in the call, and the extension button number in the call (step 4405). Next, control the communication path switch 8-30,
The communication path is closed based on the handset memory shown in FIG. 14 or 15 (step 4406).

[0164] On the other hand, when the switching equipment detects that it has received call information (Fig. 38, 3803) from the terminal equipment according to Fig. 51 (Fig. 38, 3804),
Execute the call information reception process shown in .

First, the call type included in the received call information is determined (step 5401). Here, since the call is an extension call, the extension call route (54-2) is selected.
Executes extension call processing.

[0166] In this extension call processing, first, status information (3806 in FIG. 38) including the handset type and extension memory number and information indicating that the call is an extension call is edited (step 5410), and the status information is Information (Figure 38, 3
806) is sent to the terminal device that made the extension call (step 5411). Next, the status is set to busy and the handset type is set in the corresponding area of the extension memory shown in FIG. 22 or 23 (step 5412).
), and also sets the extension connection and the extension memory number in the corresponding area of the terminal memory shown in FIG. 24 (step 5413). Subsequently, a dial tone (DT tone) is sent to the terminal housing position corresponding to the handset that made the call (step 5414), and the process ends.

[0167] Furthermore, when the terminal device detects that the status information (FIG. 38, 3806) has been received from the exchange device (FIG. 38, 3807) according to FIG.
Execute the status information reception process shown in .

First, the status type included in the received status information is determined (step 4901). Since this is an extension call, the extension call route (49-4) is selected and extension call processing is executed.

[0169] In this extension call process, first, the type of handset included in the received status information is determined (step 4917), and if the handset is on the left, the buttons 'Extension 1' 8-2-1 or 'Extension 1' shown in FIG. 4 are pressed. The corresponding lamp 8-3-1 or lamp 8-3-2 corresponding to 2'8-2-2 is turned on in green (step 4918).
, if it is the right handset, it lights up orange (step 4).
919). This allows the operator to recognize at a glance which extension button is being used to make a call using either the left or right handset. Next, since this route is also passed when responding to an incoming extension call, which will be described later, processing is executed to stop the incoming call ringer (step 4920), but it has no meaning here. Note that if there is another button that indicates an incoming call and the incoming call is ringing, the ringing will continue. lastly,
The corresponding area of the extension memory shown in FIG. 16 or 17 is set to a busy state (step 4921).

Next, while listening to the DT tone from the exchange device, the operator presses the dial button group 8-1 shown in FIG.
Dial the required digits using 0 (Figure 38, 3809). Then, the call control processor 8-14 of the terminal device identifies this by the process in FIG. 42 (FIG. 38, 3810), and
Execute the dial button detection process shown in . In this dial button detection process, dial button information including the handset type and dial code (Fig. 38, 3811
) (step 4601), and the dial button information (FIG. 38) is edited for the switching device held in the handset memory (FIG. 14 or FIG. ,3
811) is sent (step 4602). The call control processor 8-14 also transmits the dialed digits to the digit display controller 8-25 and sends the dialed digits to the digit display controller 8-25.
(Step 4603).

On the other hand, when the switching device recognizes that the dial button information (FIG. 38, 3811) has been received as shown in FIG. 51 (FIG. 38, 3812), it executes the dial button information receiving process shown in FIG.

First, the connection type is determined by referring to the terminal memory corresponding to the handset shown in FIG. 24 (step 5).
901). Here, since it is an extension connection, the extension connection process is executed using the extension connection route (59-2).
Store the dials in the terminal memory shown in step 4 (step 5).
903). After this, it is determined whether the reception of the dial button information is completed (step 5904), and if the reception of the dial button information is not completed, the dial button information is received again, and if the reception is completed, the terminal memory during the call is placed on standby as shown in FIG. state (step 5905). Then, the extension call detection process shown in FIG. 53 (FIG. 38, 3813) is executed, and this extension call detection process will be described in detail in the next section.

[0173] Here, when the terminal device receiving the call responds, the call state is established (3814 in Fig. 38).

[0174] When the call ends, the handler, as in the case of trunk calls, presses the corresponding disconnect button on the handset that he wishes to disconnect the call, that is, the button 'Left Disconnect' 8-8 in FIG.
Press either -1 or 'Right Cut' 8-8-2 (Fig. 38, 3815). Then, the call control processor 8-14
detects this according to Fig. 42 (Fig. 38, 3816
), the disconnect button detection process shown in FIG. 47 is executed.

[0175] First, disconnection information including the handset type (
38, 3817) (step 4701) and sends it to the exchange device held in the handset memory shown in FIG. 14 or 15 (step 4702). Next, the communication path switch 8-30 is controlled to open the communication path with the exchange device that sent the disconnection information (step 47).
04), sets the corresponding area of the handset memory to be empty (step 4705), and ends the process.

On the other hand, when the switching device recognizes that it has received the disconnection information (3817 in FIG. 38) according to FIG.
38, 3818), the disconnection information reception process shown in FIG. 60 is executed.

First, with reference to the terminal memory shown in FIG. 24, the connection type of the corresponding handset is determined (step 6001). Here, since it is an extension connection, the extension connection route (60-2) is selected, and the extension connection process is executed.

First, extract the extension memory number held in the terminal memory shown in FIG. 24 (step 6009),
The status information indicating that the extension is vacant is edited (step 6010), and the edited status information (FIGS. 38 and 38) is edited.
20) to the disconnected terminal device (step 601
1). Next, controlling the communication path switches 1A and 1B,
The communication path between the terminal housing position corresponding to the handset and the other party's housing position held in the extension memory shown in FIG. 22 or 23 is opened (step 6012), and the BT tone is sent to the other party's housing position. (Step 6013). Next, the corresponding area of the extension memory shown in FIG. 22 or 23 is set to empty (step 6014), and the area shown in FIG.
The corresponding area of the terminal memory shown in is set to empty (step 6015), and the process ends.

[0179] Furthermore, when the terminal device detects that the status information (3820 in FIG. 38) has been received from the switching device according to FIG. 42 (3821 in FIG. 38),
Execute the status information reception process shown in .

First, the status type included in the received status information is determined (step 4901). Here, the extension empty route (49-5) is selected and the extension emptying process is executed.

[0181] In this extension blank processing, first, based on the received status information, the button 'Extension 1' 8-2- shown in FIG.
1 or 'Extension 2' Lamp 8-3 corresponding to 8-2-2
-1 or the corresponding lamp 8-3-2 is turned off (step 4922), and the incoming ringer is stopped (
Step 4923). Then, the corresponding area in the extension memory shown in FIG. 16 or 17 is set to be empty (step 4924), and the process ends.

As described above, a series of call controls are performed for an extension call.

0183] 6.4 Incoming extension call

In FIG. 39, when the switching device detects an extension call as shown in FIG. 51 (FIG. 39, 3901), it executes the extension call detection process shown in FIG.

[0185] In this extension call detection process, first, the extension call information (3902 in FIG. 39) indicating that the call is an extension call including the caller's accommodation location number and the caller's extension number is edited (
In step 5301), the extension call information (FIG. 39, 3902) is sent to the terminal device that received the extension call.

On the other hand, when the terminal device detects that extension call information has been received from the switching device as shown in FIG. 42 (FIG. 39, 3903), it executes the extension call detection process shown in FIG. 48.

[0187] In this extension call detection process, first, the process shown in FIG.
Refer to extension memory 1 shown in , and press button 'Extension 1' 8-2.
Detect whether the extension corresponding to -1 is empty (step 48
01), if it is empty, the processing from step 4803 onwards is executed. If it is not empty, the extension memory 2 shown in FIG. 17 is referred to and it is detected whether the extension corresponding to the button 'Extension 2' 8-2-2 is empty (step 4802). That is, steps 4801 and 4802 are processes for detecting whether there is a vacant extension and capturing the vacant extension memory. As a result, if there is no empty extension memory, the extension call completion information (3909 in FIG. 39), which includes the caller accommodation location number and indicates that the extension call cannot be received, is edited (step 48).
09), extension call incomplete information (Figure 39, 3909)
is sent to the switching equipment that sent the extension call information (step 4810). In addition, if the extension memory can be captured, extension call completion information (3906 in Figure 39), which includes the number of the captured extension memory and the caller accommodation location number, and indicates that the extension call can be received, is sent. Edit (step 4803) and enter the extension call completion information (Fig. 39, 390).
6) is sent to the switching device that sent the extension call information (step 4804). Next, Figure 16 or Figure 1
The captured extension memory of the extension memory shown in 7 holds the fact that the call is in progress, the switching equipment number that detected the incoming call, and the calling party's extension number (step 4805). Next, press the button 'Extension 1' 8-2-1 or 'Extension 2' 8-2-2
The corresponding lamp 8-3-1 or lamp 8-3-2 is blinked in red (step 48).
06) The incoming call is displayed and the incoming call ringer 8-13 shown in FIG. 4 is sounded (step 4807) to audibly display the incoming call. Further, the calling party's extension number is displayed on the numeric display 8-9 shown in FIG. 4 (step 4808), and the process ends.

On the other hand, when the switching device detects that the extension call completion information has been received from the terminal device as shown in FIG. 51 (FIG. 39, 3910), it executes the extension call completion information reception process shown in FIG. , a busy tone (BT) is placed in the caller storage location.
(step 5701).

[0189] Further, when the switching equipment detects that extension call completion information has been received from the terminal equipment as shown in Fig. 51, (
39, 3907), the extension call completion information reception process shown in FIG. 56 is executed.

[0190] In this extension call completion information reception process, first, the information indicating that an incoming call is in the corresponding extension memory area of the extension memory shown in FIG. 22 or 23 and the caller's accommodation location number (step 5601), extracts the calling party's extension memory number held in the area corresponding to the calling party's accommodation location in the terminal memory shown in FIG. 24, and extracts the calling party's extension memory number shown in FIG. 22 or 23 The accommodation location number of the called party is set in the corresponding area of the extension memory (step 5602), and a ring tone (RBT tone) is sent to the accommodation location of the caller (step 5603). This allows the caller and called party to
The accommodation locations of the other party are set in the extension memory used by each party, and information necessary for performing subsequent call control is set therein.

[0191] Next, the operator of the terminal device receiving the extension call should turn on the flashing red lamp 8-3-1 or lamp 8-3.
-2, the button ``Extension 1'' 8-2-1 or ``Extension 2'' 8-2-2 is pressed (Fig. 39, 3912), and the call control processor 8-14 of the terminal device presses it according to Fig. 42. When detected (FIG. 39, 3913), the extension button detection process shown in FIG. 44 is executed.

[0192] In this extension button detection process, first,
6 or the extension memory corresponding to the pressed button shown in FIG. 17 to determine the state of the extension (step 4
401). Here, since the status is incoming call, the incoming call route (44-3) is selected, and processing for responding to the incoming extension call is executed.

First, the response information (FIGS. 39, 3914) including the selected handset type and indicating that an incoming extension call will be answered is edited according to the procedure shown in FIGS. 34 and 35 (step 4407), and the response information shown in FIGS. The response information (3914 in FIG. 39) is sent to the switching device held in the extension memory shown in (step 4408). Next, the handset memory shown in FIG. 14 or 15 is set to indicate that the status is in a call, the switching device number in the call, and the extension button number in the call (step 44).
05), then control the communication path switch 8-30, and
4 or the handset memory shown in FIG. 15 (step 4406).

Next, when the switching device detects that response information has been received from the terminal device according to FIG. 51 (FIG. 39)
, 3915), and executes the response information reception process shown in FIG.

In this response information reception process, first, the response type included in the received response information is determined (step 5).
801). Here, since it is an extension response, the extension response route (58-2) is selected and the extension response process is executed.

First, state information including the fact that it is an extension call, the handset type, and the extension memory number (see FIG.
3917) (step 5810), and the status information (FIG. 39, 3917) is edited for the terminal device that responded by extension.
) is sent (step 5811). Next, the corresponding area of the extension memory shown in FIG. 22 or 23 is set to busy (step 5812), and the corresponding handset area of the terminal memory shown in FIG. A memory number is set (step 5813). Next, the communication path switches 1A and 1B are controlled to close a communication path between the terminal housing position that sent the response information and the caller housing position held in the corresponding extension memory (
step 5814). Then, the RB to the caller accommodation position
The T sound is stopped (step 5815), and the process ends.

According to FIG. 42, the terminal device receives the state information (
39, 3917)) is detected (Fig. 39, 3917).
9, 3918), executes the status information reception process shown in FIGS. 49 and 50.

In this state information receiving process, first, the state type included in the state information is determined (step 490
1). Since this is an extension call, the extension call route (49-4) is selected and extension call processing is executed.

[0199] In this extension call processing, first, the type of handset included in the received status information is determined (step 4917), and if it is a left handset, the button 'Extension 1' 8-2-1 or 'Extension The corresponding lamp 8-3-1 or lamp 8-3-2 corresponding to 2'8-2-2 is turned on in green (step 4918).
, if it is the right handset, it lights up orange (step 4).
919). This allows the operator to recognize at a glance which extension button is being used to make a call using either the left or right handset. The incoming ringer is stopped (step 4920). Note that if there is another button that indicates an incoming call and the incoming call is ringing, the ringing will continue. next,
The corresponding area of the extension memory shown in FIG. 16 or 17 is set to a busy state (step 4921), and the process ends.

[0200] The handset of the terminal device that has been operated to respond by the above call control can communicate with the terminal device on the calling side (
39, 3920).

[0201] When the call is terminated, the handler must press the corresponding disconnect button on the handset where he wishes to disconnect the call, ie the button 'Left disconnect' 8-8-1 or 'Right disconnect' 8-8- in FIG.
2 is pressed to perform a disconnection operation, and the subsequent process is call control similar to the disconnection process in the case of an extension call shown in FIG. 38, so a description thereof will be omitted.

0202] 6.5 Auto dial trunk call

[
[0203] In Fig. 40, when the operator of the terminal presses any of the buttons 'Autodial 1' 8-6-1 to 'Autodial q' 8-6-q (Fig. 40, 4001 ), call control processor 8-1 of the terminal device
4 detects this according to FIG. 42 (FIGS. 40 and 400).
2) Execute the auto dial button detection process shown in FIG.

[0204] In this auto dial button detection process,
First, press the buttons 'Autodial 1' 8-6-1 to 'Autodial q' on the autodial table shown in Figure 8.
The type of auto dial is determined by referring to the area corresponding to the pressed button in 8-6-q (step 45).
01). Here, assuming that trunk auto-dial is set, auto-dial trunk call origination processing for the trunk route (45-1) is executed.

[0205] In this auto-dial trunk call origination process, first, the acquisition priorities registered in the trunk button table shown in FIG. 7 are searched, and the trunk with the highest priority is acquired (step 4502). Next, Figure 1
8 or the area corresponding to the captured trunk in the trunk memory shown in FIG. 19 to determine the state of the trunk (step 4503), and if it is not empty, select the trunk with the next highest priority. and similarly determine the state of the trunk (steps 4504, 4502, 450
3). Here, if there is no empty trunk, the pressed button (any one of the buttons 'Auto Dial 1' 8-6-1 to 'Auto Dial q' 8-6-q) will be invalid. . In addition, when it is determined that the empty trunk with the highest priority is acquired, the dial number and handset type are extracted from the information held in the area corresponding to the pressed button in the auto dial table shown in Figure 8. , and trunk accommodation location number, and indicates that the call is an auto-dial trunk call (Figs. 40, 40
05) (step 4505), and sends the calling information (4005 in FIG. 40) to the switching device registered in the trunk button table shown in FIG. 7 (step 4506). Next, the corresponding area of the trunk memory shown in FIG. 18 or 19 is set to reserved (step 45).
07), Set the status as busy, the busy switching equipment number, the busy trunk button number, and the busy (pressed) auto-dial number in the corresponding area of the handset memory shown in FIG. 14 or 15. (Step 450
8). Next, turn on the lamps 8 corresponding to the buttons 'auto dial 1' 8-6-1 to 'auto dial q' 8-6-q.
The corresponding lamp from -7-1 to 8-7-q is turned on in a color (green or orange) corresponding to the handset type (step 4509). Then, based on the handset memory shown in FIG. 14 or 15, the communication path switch 8
-30 and closes the communication path (step 4510
).

Next, when the switching device detects that call information has been received from the terminal device according to FIG. 51 (see FIG. 40
, 4006), and executes the call information reception process shown in FIGS. 54 and 55.

[0207] In this call information reception process, first, the call type included in the received call information is determined (step 5401). Here, since an auto-dial trunk call is made, the auto-dial trunk call route (54-3)
is selected and auto-dial call processing is executed.

First, the status of the relevant trunk is determined by the trunk memory shown in FIG. 25 (step 5416), and if the trunk is not empty, a call cannot be made, so the terminal device that is compatible with the handset mode of the terminal device that sent the call information is A busy tone (BT tone) is sent to the accommodation position (step 5424). If the trunk is empty, status information indicating that the call is a trunk call is edited, including the handset type, trunk accommodation location number, and calling terminal number (step 5).
417), status information for all terminal devices (Fig. 40,
4010) is sent (step 5418). Next, the corresponding area of the trunk memory shown in FIG. 25 is set to be in a call (step 5419), and the area of the corresponding handset of the terminal memory shown in FIG. Set the number (step 5420). Next, call path switch 1A or 1B
is controlled to close a communication path between the handset-compatible terminal housing position and the trunk housing position (step 5421).
), sends a calling order to the trunk to activate the line (step 5422), and then sends a dial order to the trunk (step 5423).

[0209] Furthermore, when the terminal device recognizes that the status information (4010 in Figure 40) has been received through the process in Figure 42 (4011 in Figure 40), it executes the status information reception process shown in Figures 49 and 50. do.

[0210] First, the received status information (Fig. 40, 401
0) is determined (step 4901).
, executes trunk call processing for the trunk call route (49-1). It is determined whether the trunk is registered in the trunk button table shown in FIG. 7 (step 4902).
), this state information is ignored if it is not registered. If it is registered, the terminal number included in this status information is compared with the own terminal number shown in FIG. 9 (step 4).
903). If they match, it is determined that the status information is the result of a call made by the own terminal device, and the handset type included in the status information is determined (step 4904).
), if it is a left handset, one of the lamps 8-5-1 to 8-5-p corresponding to the buttons 'trunk 1' 8-4-1 to 'trunk p' 8-4-p shown in FIG. The corresponding lamp lights up in green (step 4905), and if it is the right handset, lights up in orange (step 4906).
. This allows the operator to recognize at a glance which of the left and right handsets is being used and which button is being used to make a call.

On the other hand, if the terminal number included in the status information is another terminal number, press the button 'Trunk 1' 8-4.
Lamp 8 corresponding to -1 to 'trunk p'8-4-p
-5-1 to 8-5-p are turned on in red (step 4907) to indicate that another terminal is in use. Next, processing for stopping the incoming ringer is performed (step 4908) (here, it has no meaning). Finally, the corresponding area of the trunk memory shown in FIG. 18 or 19 is set to be busy (step 4909).
, ends the process.

Thereafter, when the called party answers, the call state (4013 in FIG. 40) is established.

[0213] Regarding the cutting process in Fig. 40,
The difference between the trunk call disconnection process and the trunk call disconnection process shown in FIG.
Processing to turn off the corresponding lamp among the lamps 8-7-1 to 8-7-q corresponding to 6-q (FIG. 40, 401
6), so the explanation will be omitted.

As described above, a series of call controls for auto-dial trunk calls are performed.

0215] 6.6 Auto dial extension call

02
16] In FIG. 41, the operator of the terminal device presses the buttons 'Autodial 1' 8-6-1 to 'Autodial q'.
When you press any button from 8-6-q (Fig. 41
, 4101), and the call control processor 8-14 of the terminal device detects this according to FIG. 42 (FIG. 40, 4102).
, executes the auto-dial button detection process shown in FIG.

[0217] In this auto dial button detection process,
First, press the buttons 'Autodial 1' 8-6-1 to 'Autodial q' on the autodial table shown in Figure 8.
The type of auto dial is determined by referring to the area corresponding to the pressed button in 8-6-q (step 45).
01). Here, assuming that extension auto-dial is set, auto-dial extension call processing for the extension route (45-2) is executed.

[0218] In this auto-dial extension calling process, first, it is determined whether the extension is in an empty state by referring to the extension memory 1 shown in FIG. Execute. If the extension is not empty, it is determined whether the extension is empty by referring to the extension memory 2 shown in FIG. 17 (step 4512), and if the extension is empty,
Processing from step 4513 onwards is executed. That is, as a result of determining the state of the extension memory in step 4511 and step 4512, if both of the extension memory states are other than the empty state, one of the buttons ``auto dial 1'' 8-6-1 to ``auto dial q'' 8-6-q is pressed. Disables the pressed button. In addition, if there is an empty extension memory, that extension memory is captured and the auto dial table shown in Figure 8 is
Call information (4105 in FIG. 41) indicating that the call is an auto-dial extension call, including the dial number, handset type, and extension memory type extracted from the information held in the area corresponding to the pressed button. Edit (step 4513), and send the calling information (Fig. 41) to the switching equipment registered in the calling switching equipment number table shown in Fig. 11.
, 4105) (step 4514). next,
The corresponding area of the extension memory shown in FIG. 16 or 17 is set to reserved (step 4515), and the corresponding area of the handset memory shown in FIG. The number, the extension button number during a call, and the auto-dial number during a call (pressed) are set (step 4516). Next, press the buttons 'Autodial 1'8-6-1 to 'Autodialq'8-
Color the corresponding lamp among the lamps 8-7-1 to 8-7-q corresponding to 6-q in the color corresponding to the handset type (
(step 4509). Then, based on the handset memory shown in FIG. 14 or 15, the communication path switch 8-30 is controlled to close the communication path (step 4510).

On the other hand, when the switching device detects that it has received call information (FIG. 41, 4105) from the terminal device (FIG. 41, 4106) according to FIG.
Execute the call information reception process shown in .

First, the call type included in the received call information is determined (step 5401). Since this is an auto-dial extension call, the auto-dial extension call route (54-4) is selected and auto-dial extension call processing is executed.

[0221] In this auto-dial extension call processing, first, status information (Figs. 41, 41
08) (step 5425), and its status information (
41, 4108) to the terminal device that made the auto-dial extension call (step 5426). Next, the status is set to busy and the handset type is set in the corresponding area of the extension memory shown in FIG. 22 or 23 (step 5427), and the corresponding area of the terminal memory shown in FIG. 24 is set. The fact that it is an extension connection and the extension memory number are set (step 5428). continue,
The terminal accommodating position corresponding to the calling handset is placed in a standby state (step 5429), and the already explained extension call detection process shown in FIG. 53 is executed (step 5430).

[0222] Further, when the terminal device detects that the status information (FIG. 41, 4108) has been received from the exchange device as shown in FIG. 42, it executes the status information reception process shown in FIGS. 49 and 50.

First, the status type included in the received status information is determined (step 4901). Since this is an extension call, the extension call route (49-4) is selected and extension call processing is executed.

[0224] In this extension call processing, first, the type of handset included in the received status information is determined (step 4917), and if the handset is on the left, the buttons 'Extension 1' 8-2-1 or 'Extension 1' shown in Fig. 4 are pressed. The corresponding lamp 8-3-1 or lamp 8-3-2 corresponding to 2'8-2-2 is turned on in green (step 4918).
, if it is the right handset, it lights up orange (step 4).
919). This allows the operator to recognize at a glance which extension button is being used to make a call using either the left or right handset. Next, processing for stopping the incoming ringer is executed (step 4920) (here, it has no meaning). Finally, the corresponding area of the extension memory shown in FIG. 16 or 17 is set to a busy state (step 4921).

[0225] In this state, when the called party answers the incoming call,
The call state is entered (FIG. 41, 4111).

[0226] Regarding the cutting process in Fig. 41,
The difference between the extension call disconnection process and the process shown in Figure 37 is that
When the terminal device detects a disconnection, press the buttons 'Autodial 1'8-6-1 to 'Autodialq'8-6-
Process of turning off the corresponding lamp among the lamps 8-7-1 to 8-7-q corresponding to q (FIG. 41, 4114)
The explanation will be omitted.

[0227] As described above, a series of call controls for auto-dial extension calls are performed.

[0228]§7. Conclusion

Although the embodiment of the telephone exchange system according to the present invention has been described above, the configuration example according to the present invention is not limited to this embodiment. For example, a terminal device may have three or more handsets, and may have three or more extension call control memories. Furthermore, there may be three or more sets of exchange devices to be connected. Regardless of the system configuration, it is clear from the above description that according to the present invention, a plurality of switching devices function as if they were one large-scale switching device from the viewpoint of the terminal device.

Furthermore, in this embodiment, trunk calling, trunk calling, extension calling, extension calling, auto-dial trunk calling, and auto-dialing extension calling have been explained as call control. For other typical call controls such as transfer, interruption, and conference, the table, temporary memory structure, call control message structure, call control sequence, and individual call control concepts disclosed in this example will be developed. It is also clear that this can be easily realized.

[0231]

[Effects of the Invention] According to the present invention, since a part of the call control is shared on the terminal equipment side, the load on the switching equipment is reduced, and the line processing capacity is improved in proportion to the number of switching equipment connected. It has the effect of being able to

[0232] Furthermore, if a telephone switching system is configured using N switching equipment, for example, even if one switching equipment goes down, the system as a whole will only go down by 1/N, which increases reliability. There is also the effect of improving sex.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the configuration of a telephone switching system according to the present invention.

FIG. 2 is a diagram showing an example of the configuration of a telephone switching system according to the present invention.

FIG. 3 is a diagram showing an example of the configuration of a telephone switching system according to the present invention.

FIG. 4 is a diagram showing a panel configuration of a terminal device according to the present invention.

FIG. 5 is a block diagram showing the hardware configuration of a terminal device according to the present invention.

FIG. 6 is a block diagram illustrating a dedicated extension circuit of a switching device according to the invention;

FIG. 7 is a diagram showing a table (trunk button table) included in the terminal device.

FIG. 8 is a diagram showing a table (auto dial button table) included in the terminal device.

FIG. 9 is a diagram showing a table (terminal number table) included in the terminal device.

FIG. 10 is a diagram showing a table (handset mode table) included in the terminal device.

FIG. 11 is a diagram showing a table (calling switching equipment number table) included in the terminal device.

FIG. 12 is a diagram showing a table (left hand continuous mode table) included in the terminal device.

FIG. 13 is a diagram showing a table (right hand continuous mode table) included in the terminal device.

FIG. 14 is a diagram showing a temporary memory (left (L) handset memory) included in the terminal device.

FIG. 15 is a diagram showing a temporary memory (right (R) handset memory) included in the terminal device.

[Fig. 16] Temporary memory possessed by the terminal device (extension memory 1
).

[Fig. 17] Temporary memory possessed by the terminal device (extension memory 2
).

FIG. 18 is a diagram showing a temporary memory (trunk memory accommodating exchange device A) included in the terminal device.

FIG. 19 is a diagram showing a temporary memory (trunk memory accommodating exchange device B) included in the terminal device.

FIG. 20 is a diagram showing a temporary memory (double hand button memory) included in the terminal device.

FIG. 21 is a diagram showing a table (terminal number table) included in the switching device.

[Fig. 22] Temporary memory possessed by the switching device (extension memory 1
).

[Fig. 23] Temporary memory possessed by the switching device (extension memory 2
).

[Figure 24] Temporary memory (terminal memory) possessed by the exchange device
FIG.

FIG. 25 is a diagram showing a temporary memory (trunk memory) included in the terminal device.

FIG. 26 is a diagram showing a call control message (calling information) from the terminal device toward the switching device.

FIG. 27 is a diagram showing a call control message (response information) from the terminal device toward the switching device.

FIG. 28 is a diagram showing a call control message (dial button information) from the terminal device toward the switching device.

FIG. 29 is a diagram showing a call control message (disconnection information) from the terminal device toward the switching device.

FIG. 30 is a diagram showing a call control message (extension call completion information) from the terminal device toward the switching device.

FIG. 31 is a diagram showing a call control message (extension call completion information) from the terminal device toward the switching device.

FIG. 32 is a diagram showing a call control message (status information) from the switching device toward the terminal device.

FIG. 33 is a diagram showing a call control message (incoming extension call information) from the switching device toward the terminal device.

FIG. 34 is a flowchart (1/2) showing a handset selection procedure.

FIG. 35 is a flowchart (2/2) showing a handset selection procedure.

FIG. 36 is a diagram showing a call control sequence at the time of trunk call origination.

FIG. 37 is a diagram showing a call control sequence when a trunk call arrives.

FIG. 38 is a diagram showing a call control sequence when an extension call is made.

FIG. 39 is a diagram showing a call control sequence when an extension call arrives.

FIG. 40 is a diagram showing a call control sequence when an auto-dial trunk call is made.

FIG. 41 is a diagram showing a call control sequence when an auto-dial extension call is made.

FIG. 42 is a flowchart showing call control (event detection processing) of a terminal device.

FIG. 43 is a flowchart showing call control (trunk button detection processing) of a terminal device.

FIG. 44 is a flowchart showing call control (extension button detection processing) of the terminal device.

FIG. 45 is a flowchart showing call control (auto dial button detection processing) of a terminal device.

FIG. 46 is a flowchart showing call control (dial button detection processing) of the terminal device.

FIG. 47 is a flowchart showing call control (disconnect button detection processing) of the terminal device.

[Figure 48] Call control of terminal equipment (extension call information reception process)
It is a flowchart which shows.

[Fig. 49] Call control of terminal equipment (state information reception processing (1/
2)) is a flowchart showing the process.

[Fig. 50] Call control of terminal equipment (state information reception processing (2/2)
2)) is a flowchart showing the process.

FIG. 51 is a flowchart showing call control (event detection processing) of the switching device.

[Figure 52] Call control of switching equipment (trunk call arrival detection process)
It is a flowchart which shows.

FIG. 53 is a flowchart showing call control (incoming extension call detection processing) of the switching device.

[Fig. 54] Call control of switching equipment (calling information reception processing (1/
2)) is a flowchart showing the process.

[Fig. 55] Call control of switching equipment (calling information reception processing (2/2)
2)) is a flowchart showing the process.

FIG. 56 is a flowchart showing call control (extension call completion information reception processing) of the switching device.

FIG. 57 is a flowchart showing call control (extension call incomplete information reception process) of the switching device.

FIG. 58 is a flowchart showing call control (response information reception processing) of the switching device.

FIG. 59 is a flowchart showing call control (dial button information reception processing) of the switching device.

FIG. 60 is a flowchart showing call control (disconnection information reception processing) of the switching device.

FIG. 61 is a diagram showing a configuration example of a conventional telephone switching system.

[Explanation of symbols]

1A, 1B...Call path switch, 2A, 2B...Conventional telephone terminal, 3A, 3B...Extension circuit, 4A, 4B...Trunk, 5A, 5B...Central control unit, 6A, 6B...Storage device,
7A, 7B...Control system bus, 8...Terminal device, 9A, 9B...
Dedicated extension circuit.

Claims (5)

[Claims] Claim 1: A telephone switching system in which one terminal device is connected to a plurality of switching devices, wherein when the terminal device recognizes that processing for connecting a call has occurred, the terminal device connects the terminal device to a plurality of switching devices. A telephone switching system characterized by selecting one switching device and performing call connection processing. [Claim 2] The terminal device has a plurality of call circuits, and assigns connection priorities to the plurality of call circuits, and when it recognizes that a process for connecting a call has occurred, based on the priority order. 2. The telephone exchange system according to claim 1, wherein the telephone exchange system performs call connection processing. 3. A telephone switching system in which one terminal device is connected to a plurality of switching devices, wherein the switching device that sends the incoming call information indicating an incoming call to the terminal device is the one that receives the incoming call from the terminal device. 1. A telephone exchange system characterized by receiving information indicating whether or not it is possible, and performing exchange processing based on the received information. 4. A telephone switching system in which one terminal device is connected to a plurality of switching devices, wherein the switching device that detects an incoming call to the terminal device indicates the incoming call to the terminal device. The terminal device that sends the incoming call information and receives the incoming call information determines whether the incoming call is possible, and if the incoming call is possible, sends incoming call completion information indicating that the incoming call is possible. If it is impossible to send out or receive a call, it sends out call completion information indicating that the call is not possible, and the switching device receives the call completion information or call completion information. A telephone switching system is characterized in that the telephone exchange system then processes the calling party. 5. A terminal device comprising one terminal device having a handset and a plurality of switching devices each connected to the terminal device through one line, the terminal device having the handset and the switching device. A telephone exchange system characterized by comprising switch means for arbitrarily connecting.