JP2858594B2 - Switching device and connection control method in the switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exchange for connecting a plurality of extension terminals to external lines, and to a connection control method for the exchange.

[0002]

2. Description of the Related Art With the spread of digital communication, communication terminals capable of simultaneously performing communication on a plurality of channels have been developed in recent years. For example, terminals capable of using a telephone while performing G4 class facsimile communication have been developed. On the other hand, the digitization of transmission lines and exchange switches of telephone exchanges has been advanced, and telephone exchanges capable of connecting extension terminals capable of using a plurality of channels as described above have been developed.

In such a telephone exchange, when a communication terminal capable of using a plurality of channels is connected to an extension, and a facsimile signal is received during a telephone call at the communication terminal, the communication terminal is conventionally connected to the extension. Connected to any terminal of facsimile.

[0004]

To explain this specific example, an incoming call from a G3 / G4 / telephone combined terminal (terminal A) connected to the network side is received, and this call is transmitted to the G3 connected to the extension. / G4 / telephone combined terminal (terminal B). However, the process of connecting to the terminal B may be, for example, a case where a different terminal is forwarded after a response, a case where the terminal B is designated by a subaddress, a case where the terminal B accidentally responds, and the like. .

[0005] When the terminal A and the terminal B are connected and communicating with each other, a case is considered in which the terminal A on the network side simultaneously performs G4 facsimile transmission to the 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 high layer compatibility information element is G4,
It will be connected to the G4 facsimile connected to the extension. However, in the conventional telephone exchange, the terminal A
Cannot send a facsimile signal to terminal B, and calls all terminals (G4 facsimile terminals) connected to the extension that match the higher layer compatibility information element, or calls any G4 facsimile terminal. Call. As a result, the facsimile reaches a terminal different from the terminal B.

[0006] This makes it possible for an extension facsimile terminal connected for facsimile reception to perform a transfer operation to the terminal B, but this forces an extra operation to the user and is not preferred.

SUMMARY OF THE INVENTION The present invention has been made in view of the above conventional example, and has as its object to provide an exchange apparatus capable of performing communication in response to an incoming call from an outside line and a connection control method in the exchange apparatus.

[0008]

In order to achieve the above object, an exchange according to the present invention has the following arrangement. That is, a connection means for connecting a plurality of extension terminals to an outside line, and a callee number transmitted by the extension terminal when an outside line is transmitted from any of the plurality of extension terminals is stored in correspondence with the identification number of the calling extension terminal. Storage means for determining whether the incoming caller number of the incoming call coincides with the called party number stored in the storage means when an incoming call is made from an outside line; And a control means for controlling the connection means so as to connect the calling extension terminal that has performed the outside line calling and the outside line that has received the incoming call.

In order to achieve the above object, a connection control method in a switching device according to the present invention includes the following steps.
That is, a connection control method in a switching device for connecting a plurality of extension terminals to an external line, wherein a callee number transmitted by the extension terminal when an external line is transmitted from any of the plurality of extension terminals is identified as the originating extension terminal. A storing step of storing the number corresponding to a number; a determining step of determining whether a caller number of the incoming call matches the called number stored in the storing step when there is an incoming call from an outside line; When a match is determined in the step, a connection step of connecting the calling extension terminal that has made the outside line transmission and the outside line that has received the call is provided.

[0010]

With the above arrangement, a plurality of extension terminals are connected,
When calling an outside line from one of these multiple extension terminals,
The called party number transmitted by the extension terminal is stored in correspondence with the identification number of the calling extension terminal. When an incoming call is received from an outside line, it is determined whether or not the caller number of the incoming call matches the stored called number. It operates to connect to the outside line.

[0011]

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

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

In FIG. 1, reference numeral 101 denotes an ISDN network;
2 is a digital communication line. Reference numeral 103 denotes a main unit of the telephone exchange according to the present embodiment. Reference numeral 104 denotes a digital communication line interface unit which converts a signal of the digital line 102 into a B1 channel (64 Kbps) data line 105.
And a B2 channel (64 Kbps) data line 106, and can transmit and receive data to and from the main control unit (CPU) 113 via the inter-CPU communication bus 107. Reference numeral 108 denotes a G4 class facsimile terminal connected to the extension interface unit 119 as an extension terminal.

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

Reference numeral 117 denotes an extension B1 channel (64 Kbps).
s), 118 is the extension B2 channel (64 Kbps), 1
19 is an extension interface, 120 is an extension transmission line, 1
Reference numeral 21 denotes a G3 / G4 / telephone combined type extension terminal.

FIG. 2 is a block diagram showing a schematic configuration of the digital communication line interface unit 104 of the embodiment.
In this embodiment, two 64 Kbps communication channels (B channels) are used as digital communication lines. 16Kbps
The following description is based on the assumption that the ISDN 101 configured with one control channel (D channel) is used. Note that the same parts as those in FIG. 1 are indicated by the same reference numerals.

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, layer 2 (LAPD) control, and the like. 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. Layer 1
The layer 2 control unit 202 has a phase control oscillator (digital PLL) 203 inside, and the ISDN 10
64KHz, 8KHz synchronized with the data received from 1
Clock signals 220 and 205 are generated. 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, the communication detection signal 219 is activated to determine which line clock signal can be used for the network synchronization unit. Notify.

The B channel data is supplied to a serial / parallel conversion circuit (S / P) 209 and a FIFO (First In First
Out) buffer 210, and is connected to highway 213 via parallel / serial conversion circuit (P / S) 212. For example, in the case of data reception, the B channel data 207, 20 decomposed by the layer 1 / layer 2 control unit 202
8 is converted into 8-bit parallel data by a serial / parallel conversion circuit 209. The converted 8-bit data is used as the 8 KHz clock signal 2 described above.
05, is written to the FIFO buffer 210,
2K synchronized with the operation clock signal of the exchange switch 110
The data is read from the FIFO buffer 210 in synchronization with the clock signal 206 of Hz. The parallel data read in this manner is supplied to a parallel / serial conversion circuit (P / S) 2
The data is converted into serial data by the H.12 and transmitted to the assigned time slot on the highway 213.

Conversely, the exchange switch 110 sends the ISDN1
01 is transmitted to the serial / parallel converter 209 in the reverse order.
Is converted into an 8-bit parallel signal, and is converted to a parallel / serial converter 212 via a FIFO buffer 210.
, And then transmitted to the layer 1 / layer 2 control unit 202.

FIG. 3 is a block diagram showing a schematic configuration of the extension interface unit 119 of the telephone exchange according to the present invention.

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

Next, referring to FIG. 1 to FIG.
The basic operation when there is an incoming call from No. 1 will be described.

When an incoming call is received from ISDN 101, digital communication line interface section 104 receives a setting message. Received messages are Layer 1, Layer 2
The data is temporarily stored in the memory 216 by the DMAC 204 incorporated in the processing unit 202. Thereafter, the digital communication line interface unit 104 issues an interrupt request to the main control unit 113 in accordance with the control procedure shown in FIG. In this way, the interface unit 104 that has received the communication start permission from the main control unit 113 sets the transfer data length to the main control unit 1.
Then, 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 transmitted message and determines an extension terminal to be connected based on the information element type (attribute). For example, if the higher layer compatibility information element is voice, some or all of the extension telephones will be called. If the subaddress has been added, the extension terminal corresponding to the subaddress is called.

When the extension terminal to be called is determined in this way, the main control unit 113 sends incoming information to the extension interface unit 119 in accordance with the communication procedure shown in FIG. That is, a transmission start command is sent to the corresponding extension interface unit via the inter-CPU communication bus 107 to notify the extension interface unit 119 of the transmission data length, and then incoming information is sent by DMA transfer.

In the extension interface unit 119 receiving the incoming call information, after the information is temporarily stored in the RAM 354,
DMAC built in layer 1 and layer 2 processing unit 341
By 342, it is sent to the layer 1 and layer 2 processing unit 341.

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

The extension telephone receiving this data rings and, when a response is received, the extension interface 1
Notify 19. The information is transmitted to the main control unit 113 in a completely reverse order to the procedure described above. Accordingly, the main control unit 113 switches the exchange switch 110 to physically connect the B1 channel on the network side and the B1 channel on the extension side.

For the B channel data, for example, in the case of a digital communication line interface, the data is once converted from serial to parallel and converted into 8 bits,
It is written to the FIFO 210 at the timing of 8 kHz,
F at 2MHz clock during period corresponding to time slot
The data is read from the IFO, converted into parallel-serial data, and output on the highway. The same is true for the reverse direction.

Similarly, in the case of the extension interface unit 119, the data is converted into parallel data by the serial / parallel converter 345 in synchronization with the 8 KHz clock 349, and again by the parallel / serial conversion unit 346 in synchronization with the 2 MHz clock. The parallel data is converted to serial data and output to the exchange switch 110.

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

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

First, the interface unit that wants to transmit data issues a polling request to the main control unit 113, and upon receiving a response signal (ACK) from the main control unit 113, transmits a DMA data length indicating the data length to be transmitted. Then, data is transmitted by DMA from the interface unit to the main control unit 113 by DMA. Upon receiving a response signal (ACK) indicating that normal data reception has been completed from the main control unit 113 after the data transmission has been completed, an end response request is issued, and a response signal (ACK) from the main control unit 113 in response thereto. ) Terminates the transmission process.

FIG. 5B is a diagram showing a communication procedure when data is transmitted from the main control unit 113 to the interface card. First, the main control unit 113 transmits a card select command ( When the response signal (ACK) from the interface unit is received, the data length to be transferred is transmitted. Subsequently, data is transferred from the main control unit 113 to the interface unit by DMA, and when this data transmission is completed, a response (ACK) for normal reception from the interface unit is waited for. Following this ACK, DM
Upon receiving the A end interrupt, the main control unit 113 issues an end response request to the interface unit, and waits for the receipt of the acknowledgment (ACK) to end the processing.

In this manner, the main control unit 113 can transmit and receive data to and from the digital communication line interface unit 104 and the analog communication line interface unit 105.

Next, the operation of the telephone exchange of this embodiment will be described with reference to FIG.
This will be described with reference to the flowchart of FIG. Note that the control program of the main control unit 113 for executing this processing is stored in the ROM 1
15 is stored.

First, in step S1, when there is an incoming call from the G4 / G3 / telephone combined terminal (terminal A) connected to the ISDN 101, the main control unit 113, which has received the call setting message, transmits the caller ID information in the message. The element is extracted and the data is stored in the memory 114. Thereafter, the process proceeds to step S3 to check whether there is a sub address.
If there is a sub-address, the process proceeds to step S4, and the specific terminal is sounded in order to connect to the specific terminal specified by the sub-address. Then, in step S5, when a connection is established with the extension complex terminal (terminal B), a call is started.

On the other hand, if there is no sub-address in step S3, the process proceeds to step S6, where the attributes of the terminal that has received the call are identified, and in step S7, all terminals having the same attribute are called among the terminals connected to the extension. If the transfer is necessary in step S8, the process proceeds to step S9, and the transfer is started to start a call. If the transfer is not required, the call is started in step S10. As described above, in either case,
At the start of the call, the terminal number (extension number)
The caller ID information element stored in step S2 is stored in memory 114 (step S11).

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

On the other hand, if there is no sub-address in step S13, the process proceeds to step S15, in which the main control unit 113 having received the call setting message extracts the caller ID information element in the message, and outputs the data in steps S2 and S11. The data is compared with the data stored in the 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 higher layer compatibility.

As a result of comparison, if they match, step S1
Then, the process proceeds to step 6, and in this case, the incoming call comes from the terminal A that is currently talking, and it is necessary to connect to the extension terminal B currently connected to the terminal A. Then, the process proceeds to step S16, and it is determined whether or not the attribute such as the higher layer consistency matches the terminal B. If the attributes match, the process proceeds to step S17.
, The incoming call information is sent to the extension connected to the terminal B, and the simultaneous facsimile and voice communication between the terminal A and the terminal B is realized.

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

FIG. 6 is a flowchart showing a calling process in the telephone exchange of this embodiment. A control program for executing this process is stored in the ROM 115.

First, in step S21, it is checked whether or not there is a call to the ISDN 101.
In step 22, the main control unit 113 extracts a called party number information element (dial number) from the extension terminal that has issued the call setting, associates the called party number with the calling extension terminal number, and stores the called party number information element in the memory. 114. Next, step S
Proceeding to 23, a call setting message is transmitted through the digital communication interface unit 104. Then, in step S24, it is checked whether or not the other party answers, and if answered, the process proceeds to step S25 to start a call on the first channel.

If there is an incoming call in step S26 during this call, the process proceeds from step S26 to step S27 to check whether or not the incoming information includes a subaddress.
If there is a sub address, the process proceeds to step S28, and communication is started by the terminal specified by the sub address.

On the other hand, if the sub address is not included, the flow advances to step S29 to determine whether or not the caller ID matches the content stored in the memory 114 in step S22, that is, whether or not the data communication between the terminals currently in a call. View. If they do not match, the process proceeds to step S30, and communication processing by another extension terminal is started. If they match, the process proceeds to step S31 to check whether or not the attributes of the calling terminal and the receiving terminal match. If they match, the process proceeds to step S32, and communication between these terminals is started in parallel with the call.

In the above embodiment, the simultaneous voice communication in the G4 facsimile apparatus has been described.
It is needless to say that the present invention is not limited to the 4-facsimile apparatus, but can be realized in the same manner if the terminal uses a plurality of channels, such as a G3 facsimile apparatus and a data communication terminal.

Further, in the above-described embodiment, the case where the facsimile signal is received while the voice communication is being performed has been described. However, the same can be realized even if the order is reversed.

The present invention may be applied to a system constituted by a plurality of devices or to an apparatus constituted by a single device. Needless to say, the present invention can also be applied to a case where the present invention is achieved by supplying a program for implementing the present invention to a system or an apparatus.

As described above, according to this embodiment, there is an effect that simultaneous communication can be performed using a plurality of channels between a communication terminal connected to a network and an extension terminal.

[0053]

As described above, according to the present invention, when a call is sent from an extension terminal to an outside line, and then a callee of the call receives an incoming call, the extension line of the plurality of extension terminals is received. The outgoing extension terminal that originated the call responded to the incoming call, as a callee associated with the previous call,
There is an effect that a response can be made with an appropriate extension terminal.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing a schematic configuration of a digital communication line interface unit of the telephone exchange according to the embodiment.

FIG. 3 is a block diagram illustrating a schematic configuration of an extension interface unit of the telephone exchange according to the embodiment;

FIG. 4 is a flowchart showing an incoming call operation in the telephone exchange according to the embodiment.

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

FIG. 6 is a flowchart showing a calling operation in the telephone exchange according to the embodiment.

[Explanation of symbols]

 DESCRIPTION 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 composite terminal

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04M 3/42 H04Q 3/58-3/62

Claims (2)

(57) [Claims] 1. A connecting means for connecting a plurality of extension terminals to an outside line, and when a call is made from any of the plurality of extension terminals, a called party number transmitted by the extension terminal corresponds to an identification number of the calling extension terminal. Storage means for storing when the call is received from an outside line; determining means for determining whether or not the caller number of the incoming call matches the called number stored in the storage means; A switching unit that, when determined, controls the connection unit so as to connect the calling extension terminal that has made the outside line and the outside line that has received the call. 2. A connection control method in a switching device for connecting a plurality of extension terminals to an outside line, wherein a callee number transmitted by the extension terminal is transmitted when any one of the plurality of extension terminals originates an outside line. A storage step of storing in correspondence with the identification number of the terminal; and a determination step of determining whether the caller number of the incoming call matches the called party number stored in the storage step when there is an incoming call from an outside line. A connection control method for a switching device, comprising: when a match is determined in the determination step, connecting the originating extension terminal that has performed the external line transmission to the external line that has received the incoming call.