JPH04312057A - Telephone exchange and telephone exchange method for the same device - Google Patents

Abstract

PURPOSE:To obtain a telephone exchange which enables the simultaneous communication of plural channels between a network and an extension, and the telephone exchange method of the device. CONSTITUTION:At the time of an incoming call by the first channel from a line wire terminal connected with an ISDN 101, the incoming call is connected with an extension terminal 121. At the time of this connection, the caller number of the line wire terminal is made to correspond to the terminal number of the connected extension terminal, and the data are stored in a memory 114. Then, at the time of the incoming call by the second channel from the network 101, whether or not the incoming call is transmitted from the line wire terminal is judged, and when the incoming call is judged as the transmission from the line wire terminal, the information stored in the memory 114 is referred, and the incoming call by the second channel is connected with the extension terminal 121 connected with the first channel at present.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone switching device that can be connected to a network having a caller number transmission function (for example, ISDN) and a telephone switching method in the device.

0002

2. Description of the Related Art With the spread of digital communications, communication terminals that can simultaneously carry out communication on multiple channels have been developed in recent years. For example, terminals that can use a telephone while carrying out G4 class facsimile communication have been developed. On the other hand, the digitization of transmission lines and exchange switches in telephone exchange equipment is progressing, and telephone exchange equipment that can connect extension terminals that can use multiple channels as described above has also been developed.

[0003] In such telephone switching equipment, when a communication terminal capable of using multiple channels is connected to an extension line, if a facsimile signal is received while the communication terminal is on the phone, conventionally, the facsimile signal is The fax machine was connected to any terminal.

0004

[Problem to be Solved by the Invention] To explain this specific example, a G3/G4/telephone composite terminal (
Assume that there is an incoming telephone call from terminal A), and this call is connected to the G3/G4/telephone composite terminal (terminal B) connected to the extension. However, the process of connecting to terminal B may include cases in which a different terminal is transferred after responding, cases in which terminal B is specified by a subaddress, cases in which terminal B responds by chance, etc., but the process does not matter here. .

Consider a case where, while terminal A and terminal B are connected and talking, terminal A on the network side simultaneously sends a G4 facsimile transmission to extension terminal B. When the telephone exchange receives the call setup message from terminal A,
The main control unit 13 identifies each information element. In this case, since the higher layer compatibility information element is G4,
You will be connected to the G4 facsimile connected to your extension. However, in conventional telephone switching equipment, terminal A
cannot recognize that it sent a facsimile signal to terminal B, so it calls all terminals (G4 facsimile terminals) connected to the extension that have matching high-layer compatibility information elements, or calls any G4 facsimile terminal. You will have to make a call. As a result, simultaneous communication of facsimile signals and voice signals between terminal A and terminal B becomes impossible.

[0006] This allows simultaneous communication of facsimile signals and voice signals between terminals A and B by performing a transfer operation from an extension facsimile terminal connected to receive facsimile to terminal B. However, this forces the user to perform an extra operation, which is not desirable.

The present invention has been made in view of the above-mentioned conventional example, and an object of the present invention is to provide a telephone switching device and a telephone switching method in the device that can enable simultaneous communication of a plurality of channels between a network and an extension line. shall be.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the telephone exchange device of the present invention has the following configuration. That is, a telephone switching device that accommodates an extension terminal capable of communicating on a plurality of channels, comprising connecting means for connecting an incoming call on a first channel from an outside line terminal connected to a network to the extension terminal; storage means for storing the caller number of the external line terminal in association with the terminal number of the extension terminal when a connection is made by the connecting means; a discriminating means for discriminating whether or not the call is a call; and when the discriminating means determines that the call is from the outside line terminal, the discriminating means refers to the information stored in the storage means to determine whether the call is incoming on the second channel; and means for connecting to an extension terminal.

[0009] Further, a telephone exchange method in a telephone exchange apparatus according to another invention includes the following steps. In other words, it is a telephone switching method in a telephone exchange equipment that accommodates extension terminals that can communicate on multiple channels, and when a call is received on the first channel from an external terminal connected to the network, the incoming call is transferred to the extension terminal. a step of connecting to a terminal; a step of storing the caller number of the external line terminal and the terminal number of the extension terminal in correspondence when connecting to the extension terminal;
When there is an incoming call on the channel, it is determined whether the incoming call is originating from the external line terminal, and when it is determined that the incoming call is originating from the external line terminal, the information stored in the storage means is referred to. and the incoming call on the second channel is now sent to the first channel.
and connecting to an extension terminal connected through the channel.

0010

[Operation] In the above configuration, when an incoming call is received on the first channel from an outside line terminal connected to the network, the incoming call is connected to the extension terminal, and at the time of this connection, the caller number of the outside line terminal is The terminal number of the connected extension terminal is stored in association with the terminal number. When there is an incoming call from the network on the second channel, it is determined whether the incoming call originates from that external line terminal, and if it is determined that the incoming call originates from that external line terminal, it is stored in the storage means. Referring to the received information, the incoming call on the second channel is connected to the extension terminal currently connected on the first channel.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing a schematic configuration of a telephone exchange apparatus according to this embodiment.

In FIG. 1, 101 is an ISDN network;
2 is a digital communication line. Reference numeral 103 indicates a main unit portion of the telephone exchange apparatus of this embodiment. 104 is a digital communication line interface unit that transfers the signal of the digital line 102 to the B1 channel (64 Kbps) data line 105.
and a B2 channel (64 Kbps) data line 106, and data can be sent and received to and from the main control unit (CPU) 113 via an inter-CPU communication bus 107. 108 is a G4 class facsimile terminal connected to the extension interface section 119 as an extension terminal.

A highway 109 connects the digital communication line interface section 104 and the exchange switch 110, and a highway 111 connects the exchange switch 110 and the extension interface section 119. A main control unit 113 controls the entire apparatus according to a control program stored in a ROM 115. A memory (RAM) 114 is used as a work area for the main control unit 113. 116 is an address and data bus.

117 is the extension B1 channel (64Kbps
), 118 is extension B2 channel (64Kbps), 11
9 is an extension interface, 120 is an extension transmission line, 12
1 is a G3/G4/telephone combination type extension terminal.

FIG. 2 is a block diagram showing a schematic configuration of the digital communication line interface section 104 of the embodiment. In this embodiment, there are two communication channels (B channels) of 64 Kbps as digital communication lines. 16Kbps
The following description will be made assuming that an ISDN 101 consisting of one control channel (D channel) is used. Note that parts common to those in FIG. 1 described above are indicated by the same numbers.

A layer 1/layer 2 control unit 202 is connected to the ISDN 101 via a transformer 201, and performs frame assembly/disassembly, contention control, and layer 2 (LAPD) control. Layer 1/layer 2 control unit 202
has a DMA controller (DMAC) 204 inside, and performs DMA data transfer with a memory (RAM) 216 via a D channel. Also, layer 1
- The layer 2 control unit 202 has a phase controlled oscillator (
Digital PLL) 203, ISDN101
64 KHz and 8 KHz clock signals 220 and 205 are generated in synchronization with the data received from the data source. The 64 KHz clock signal 220 generated here is input to a network synchronization unit (not shown) in the exchange switch 110.

A communication detection signal 219 is also sent from the layer 1/layer 2 control unit 202 to the network synchronization unit.
When the layer 1/layer 2 control unit 202 detects that synchronization has been established with the digital communication line 101, it activates this communication detection signal 219 and determines which line's clock signal can be used by the network synchronization unit. Notify.

B channel data is sent to the serial/parallel converter (S/P) 209, FIFO (First I
n First Out) buffer 210, parallel
It is connected to the highway 213 via a serial conversion circuit (P/S) 212. For example, in the case of data reception, the B channel data 207 and 208 decomposed by the layer 1/layer 2 control unit 202 are sent to the serial/parallel conversion circuit 2
09 into 8-bit parallel data. This converted 8-bit data is the 8KH
FIFO buffer 21 in synchronization with z clock signal 205
0 and read from the FIFO buffer 210 in synchronization with the 2 KHz clock signal 206 which is synchronized with the operating clock signal of the exchange switch 110. The parallel data thus read out is converted into serial data by a parallel/serial conversion circuit (P/S) 212 and sent to an assigned time slot on the highway 213.

Conversely, from the exchange switch 110
01, the data on the highway 214 is transferred to the serial/parallel converter 209 using the reverse procedure.
is converted into an 8-bit parallel signal by
After the signal is converted into a serial signal, it is transmitted to the layer 1/layer 2 control section 202.

FIG. 3 is a block diagram showing a schematic configuration of an extension interface section 119 of a telephone exchange device embodying the present invention.

The layer 1/layer 2 control unit 341 inputs the 384 KHz clock signal from the clock generating unit 351 and generates an 8K clock signal for serial/parallel conversion.
Outputs Hz. The B channel data sent from the exchange switch 110 is sent to the serial/parallel converter 34.
5. Layer 1 through parallel/serial converter 346
- Input to layer 2 control unit 341 and output to ISDN extension terminal 121 or 108 via transformer 340. Also, the output data from the ISDN extension terminal is layer 1.
- Output to the exchange switch 110 via the layer 2 control unit 341, the serial/parallel converter 345, and the parallel/serial converter 346. The operation of this extension interface section will be described in detail later.

Next, using FIGS. 1 to 3, ISDN10
The basic operation when there is an incoming call from 1 will be explained.

[0024] When a call is received from ISDN 101, digital communication line interface section 104 receives a setting message. Received messages are layer 1 and layer 2
The data is temporarily stored in the memory 216 by the DMAC 204 built into the processing unit 202 . Thereafter, in accordance with the control procedure shown in FIG. 5, this digital communication line interface section 104 issues an interrupt request to the main control section 113. In this way, the interface section 104, which has received permission to start communication from the main control section 113, transfers the transfer data length to the main control section 113.
13, the message stored in the RAM 216 is sent to the main control unit 113 by DMA transfer via the communication bus 107.

The main control unit 113 decodes the sent message and determines the extension terminal to be connected based on the information element type (attribute). For example, if the higher layer compatibility information element is voice, it will ring some or all of the extension's telephones. Furthermore, if a subaddress is added, the extension terminal corresponding to the subaddress will be called.

When the extension terminal to be called is determined in this way, the main control section 113 sends the incoming call information to the extension interface section 119 according to the communication procedure shown in FIG. 5(B). That is, after sending a transmission start command to the corresponding extension interface unit via the inter-CPU communication bus 107 and informing the extension interface unit 119 of the transmission data length, the incoming call information is sent by DMA transfer.

The extension interface unit 119 that receives the incoming call information stores the information in the RAM 354, and then
DMAC built into layer 1 and layer 2 processing unit 341
342, the data is sent to the layer 1 and layer 2 processing unit 341.

The layer 1 and layer 2 processing unit 341 assembles the received data into a transmission format and sends it to the extension telephone side.

The telephone of the extension that receives this data rings, and when there is a response, a message to that effect is sent to the extension interface section 11.
Notify 9. The information is transmitted to the main control unit 113 in a completely reverse order to the procedure described above. As a result, the main control unit 113 switches the exchange switch 110 to physically connect the B1 channel on the network side and the extension side.

[0030] Regarding B channel data, for example, in the case of a digital communication line interface section, after it is once serial-parallel converted and converted to 8 bits,
Written to FIFO210 at 8KHz timing,
F with a 2MHz clock for a period corresponding to a time slot.
The data is read out from the IFO, converted from parallel to serial, and sent out on the highway. The same applies to the opposite direction.

The same is true for the extension interface section 119, which is converted into parallel data by the serial/parallel converter 345 in synchronization with the 8KHz clock 349, and is again converted into parallel data by the parallel/serial conversion section 346 in synchronization with the 2MHz clock. The parallel data is converted into serial data and output to the exchange switch 110.

FIG. 5 shows a communication procedure between the main control section 113 and each interface section (interface card).

FIG. 5A is a diagram showing a case where data is transmitted from the interface section to the main control section 113.

First, the interface unit that wants to send data issues a polling request to the main control unit 113, and when it receives a response signal (ACK) from the main control unit 113, it sends a DMA data length indicating the data length that it wants to send. Then, data is transmitted from the interface section to the main control section 113 using DMA. When this data transmission is completed and a response signal (ACK) indicating that normal data reception has been completed is received from the main control unit 113, an end response request is issued, and a response signal (ACK) from the main control unit 113 is issued. ) ends the transmission process.

FIG. 5B is a diagram showing the communication procedure when data is transmitted from the main control unit 113 to the interface card. First, the main control unit 113 issues a card select command ( Upon receiving a response signal (ACK) from the interface unit, the data length to be transferred is transmitted. Next, data is transferred from the main control section 113 to the interface section using DMA, and when this data transmission is completed, a response (ACK) indicating normal reception is waited for from the interface section. Following this ACK, DM
Upon receiving the A completion interrupt, the main control unit 113 issues a completion response request to the interface unit, waits for reception of the acknowledgment (ACK), and then ends the process.

In this way, the main control section 113 can transmit and receive data between the digital communication line interface section 104 and the analog communication line interface section 105.

Next, FIG. 4 shows the operation of the telephone exchange apparatus of this embodiment.
This will be explained with reference to the flowchart. Note that the control program of the main control unit 113 that executes this process is stored in the ROM1.
It is stored in 15.

First, in step S1, when a telephone call is received from a G4/G3/telephone composite terminal (terminal A) connected to the ISDN 101, the main control unit 113, which has received a call setting message, converts the caller number information in the message. The elements are extracted and the data is stored in memory 114. Thereafter, the process proceeds to step S3, and it is checked whether there is a subaddress. If there is a subaddress, the process proceeds to step S4, and in order to connect to the specific terminal specified by the subaddress, the specific terminal is made to ring. Then, in step S5, when the extension is connected to the compound terminal (terminal B), a call is started.

On the other hand, if there is no subaddress in step S3, the process proceeds to step S6, where the attribute of the incoming terminal is identified, and in step S7, all terminals with matching attributes among the terminals connected to the extension are called. If transfer is necessary in step S8, the process advances to step S9 to transfer and start the call. Furthermore, if transfer is not necessary, the call is started directly in step S10. In any of the above cases, at the start of a call, the terminal number (extension number) of the terminal receiving the call is stored in correspondence with the caller number information element stored in step S2.
The information is stored in the memory 114 (step S11).

Now, during a call between terminal A and extension terminal B connected to this ISDN 101, if there is an incoming call to this telephone exchange device 103 in step S12, step S1
Proceed to step 3 and check whether the incoming call information includes a subaddress. If a subaddress is included, the process advances to step S14, and communication is performed with the extension terminal specified by the subaddress.

On the other hand, if there is no subaddress in step S13, the process advances to step S15, and the main control unit 113 that has received the call setup message extracts the caller number information element from the message and uses the data in steps S2 and S11. It is compared with the data stored in memory 114.

As a result of the comparison, if they do not match, the process proceeds to step S18, and an appropriate terminal is called by referring to attributes such as high layer compatibility.

As a result of the comparison, if they match, step S1
Proceeding to step 6, in this case, the call is received from terminal A, which is currently on the line, and it is necessary to connect to extension terminal B, which is currently connected to terminal A. Therefore, the process proceeds to step S16, and it is determined whether attributes such as high layer consistency match those of terminal B. If they match, step S17
Then, the incoming call information is sent to the extension line connected to terminal B, and simultaneous facsimile and voice communication between terminals A and B is realized.

However, if an attempt is made to receive a call to terminal B even though the attributes do not match in step S16, there is a risk that the call will be disconnected by terminal B. It will connect to the extension terminal.

FIG. 6 is a flowchart showing the outgoing call processing in the telephone exchange apparatus of this embodiment, and a control program for executing this processing is stored in the ROM 115.

First, in step S21, it is checked whether there is a call to ISDN 101, and if there is a call, the process goes to step S21.
In step 22, the main control unit 113 extracts the called party number information element (dial number) from the extension terminal that issued the call setup, associates it with the extension terminal number that made the call, and stores the called party number information element in memory. 114. Next step S2
Proceeding to step 3, a call setup message is sent through the digital communication interface section 104. And step S
In step S24, it is checked whether the other party responds or not, and if the other party responds, the process advances to step S25 and a conversation on the first channel is started.

During this call, if there is an incoming call in step S26, the process advances from step S26 to step S27, and it is checked whether the incoming call information includes a subaddress. If there is a subaddress, the process advances to step S28, and communication is started by the terminal specified by the subaddress.

On the other hand, if the subaddress is not included, the process advances to step S29, and it is determined whether the caller number matches the content stored in the memory 114 in step S22, that is, whether data communication is between terminals currently in use. View. If they do not match, the process advances to step S30, and communication processing by another extension terminal is started. If they match, the process proceeds to step S31, and it is checked whether the attributes of the calling terminal and the called terminal match. If they match, the process proceeds to step S32, and communication is started between these terminals in parallel with the call.

[0049] In the above embodiment, the case of simultaneous voice communication in a G4 facsimile machine was explained;
Needless to say, the present invention is not limited to G3 facsimile machines, but can be implemented in the same manner with any terminal that uses multiple channels, such as a G3 facsimile machine or a data communication terminal.

Further, in the above-described embodiment, a case has been described in which a facsimile signal is received at a place where a voice communication is being carried out first, but the same can be achieved even if the order is reversed.

The present invention may be applied to a system made up of a plurality of devices, or to an apparatus made up of one device. It goes without saying that the present invention can also be applied to cases where the present invention is achieved by supplying a program for implementing the present invention to a system or device.

As explained above, according to this embodiment, there is an advantage that simultaneous communication can be carried out using a plurality of channels between a communication terminal connected to a network and an extension terminal.

[0053]

As explained above, according to the present invention, there is an advantage that simultaneous communication can be carried out using a plurality of channels between the network and the extension line.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a telephone exchange device according to an embodiment.

FIG. 2 is a block diagram showing a schematic configuration of a digital communication line interface section of the telephone exchange device of this embodiment.

FIG. 3 is a block diagram showing a schematic configuration of an extension interface section of the telephone exchange device of this embodiment.

FIG. 4 is a flowchart showing the incoming call operation in the telephone exchange device of this embodiment.

FIG. 5 is a diagram illustrating a communication procedure between the main control unit and each interface unit of the telephone exchange device of this embodiment.

FIG. 6 is a flowchart showing a calling operation in the telephone exchange device of this embodiment.

[Explanation of symbols]

101 ISDN 102 Digital communication line 104 Digital communication line interface 110
Exchange switch 113 Main control unit 114 Memory 115 ROM 119 Extension interface 121 Extension compound terminal

Claims (4)

[Claims] 1. A telephone switching device accommodating an extension terminal capable of communicating on a plurality of channels, the connection means connecting an incoming call on a first channel from an outside line terminal connected to a network to the extension terminal. and storage means for storing the caller number of the external line terminal and the terminal number of the extension terminal in correspondence when a connection is made by the connecting means, and when a call is received from the network on a second channel, the external line terminal a discriminating means for discriminating whether the call is from the outside line terminal; and when the discriminating means determines that the call is from the outside line terminal, it refers to information stored in the storage means and determines whether the call is received on the second channel. and means for connecting the extension terminal to the extension terminal. 2. A telephone switching device accommodating an extension terminal capable of communicating on a plurality of channels, the telephone switching device comprising: connection means for connecting an outgoing call from the extension terminal on a first channel to an outside line terminal connected to a network; , storage means for storing the incoming call number of the external line terminal and the terminal number of the extension terminal in correspondence when the connection is made by the connecting means; a discriminating means for discriminating whether or not the call is a call; and when the discriminating means determines that the call is from the outside line terminal, the discriminating means refers to the information stored in the storage means to determine whether the call is incoming on the second channel; A telephone switching device comprising: means for connecting to an extension terminal. 3. A telephone switching method in a telephone switching device that accommodates extension terminals that can communicate on multiple channels, wherein when a call is received on the first channel from an external terminal connected to the network, the a step of connecting an incoming call to an extension terminal; a step of storing a caller number of the external line terminal and a terminal number of the extension terminal in correspondence when connecting to the extension terminal; and a step of storing a second caller number from the network. When there is an incoming call on the channel, it is determined whether the incoming call is originating from the external line terminal, and when it is determined that the incoming call is originating from the external line terminal, referring to the information stored in the storage means, A telephone switching method comprising the step of connecting the incoming call on the second channel to an extension terminal currently connected on the first channel. 4. A telephone switching method in a telephone switching device that accommodates extension terminals that can communicate on a plurality of channels, wherein a call from the extension terminal on a first channel is sent to an external terminal connected to a network. a step of connecting to the outside line terminal, a step of correlating and storing the incoming number of the outside line terminal and the terminal number of the extension terminal that made the call; It is determined whether the call is from an outside line terminal, and when it is determined that the call is from the outside line terminal, the information stored in the storage means is referred to and the incoming call on the second channel is currently set to the first channel. 1. A telephone switching method, comprising: connecting to an extension terminal connected through a channel.