JPH02200055A - Electronic exchange device - Google Patents

Abstract

PURPOSE:To improve the availability of a circuit by using an interface which secures the connection to an integrated service digital network(ISDN) and a means which calls an extension terminal that can perform the communication with the opposite terminal whose type is identified based on a received higher rank layer matching information element. CONSTITUTION:A switchboard 3 consists of a center control system including an exchange switch, an interface system set to an analog network 1, an interface set to an ISDN 2, and an extension interface. A ROM 17 stores various control programs which are executed by a main CPU 15. The CPU 15 transmits a call signal to an extension terminal capable of communication to the opposite terminal by means of the information given from a CPU 11 for the type of the opposite terminal based on a received higher rank layer matching information element and the memory extension terminal type information stored in a RAM 16 when a call is received from the ISDN 2. Thus an extension operator can use a circuit with high efficiency with no time required for a transfer operation.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electronic switching device, and particularly to an electronic switching device connectable to ISDN.

(Prior technology) I5DN (integrated digital network) as a digital line network
A service network) is expected to provide various information and communication services based on various media such as voice, data, and images, and such an integrated service network is
A large number of terminals can be connected to a single subscriber line.

Typical examples of the types of terminals include telephones, facsimile machines, and video terminals.

Conventionally, when an electronic switching device receives an incoming call from an outside line, if the extension terminal corresponds to the incoming number,
Regardless of the type of terminal, it would ring.

(Problem to be Solved by the Invention) However, in the above conventional example, if the extension terminal corresponds to the incoming number, the ring will ring regardless of the terminal type. There are cases where the user must determine the type of the other party's terminal and perform a transfer operation to an extension terminal that can communicate with the other party's terminal.

In other words, the terminal from which the extension terminal operator responded (e.g., telephone) is the type of calling terminal (e.g., facsimile).
If this is different, in order to start communication, the extension terminal operator must use an extension terminal of the same type as the calling party's terminal, that is, an extension terminal that can communicate with the other party's terminal (in the above example, a facsimile).
Such a transfer causes the following problems: (1) First, the extension operator is forced to spend time on unnecessary transfer operations, reducing office efficiency. On the other hand, from the perspective of the originating terminal, it is forced to wait during that time, resulting in a delay in the start of communication.

(2) Furthermore, it takes time to transfer, and the efficiency of line usage is reduced by the amount of time required for transfer, which prevents efficient use of the line. At the same time, this also results in an increase in line usage fees.

(3) Moreover, since a transfer operation by the operator is required in addition to the above, transfer errors are likely to occur, and when a transfer error occurs, there is a high possibility that communication cannot be started.

The present invention focuses on such points, and even when terminals of different types are connected as extension terminals corresponding to the same incoming call number, the above-mentioned disadvantages and inconveniences can be reduced compared to the conventional method. The purpose is to provide an electronic switching device.

(Means and effects for solving the problem) In order to achieve the above object, the present invention provides an interface that allows connection to ISDN, a means for receiving a high layer compatibility information element, and a method for receiving the received high layer compatibility information. By providing a means for calling an extension terminal that can communicate with a terminal whose type has been identified based on elements, the extension terminal operator does not need to determine the terminal type and then transfer the call to an extension terminal that can communicate with the terminal. It was made so that it could be eliminated.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an electronic switching device showing one embodiment of the present invention.

In the figure, code 1 is an analog network (analog public network)
, and reference numeral 2 indicates l5DN, respectively, and the exchange 3 performs switching operations for setting up a bus between the other party terminal and the extension terminal, or, for example, between each extension terminal via these analog WJl or l5DN2. Execute.

The exchange 3 is composed of a central control system including an exchange switch, an interface system for the analog network 1, an interface system for the 15DN 2, and an extension interface system for extension terminals that are user-side premises equipment.

The interface system for the analog network I consists of an analog station line interface 4, a CPU (1) 5 for the analog station line interface, a RAM 6, a ROM 7, a copier 8, and a timing circuit 9.

The 15DN interface system has an ISDN interface 1O. The interface process with l5DN is as follows:
CPU for l5DN interface including such l5DN interface 10 (2) 11, RAM 12, RO
This is carried out by the engineering SDN communication control unit consisting of M13, which controls the B channel and D channel according to the ISDN protocol. Further, as described later, the communication control unit identifies the terminal type using a higher layer compatibility information element, and further sends a disconnection message to the ISDN under certain conditions (step 410 in FIG. 4). It also performs call control such as (see ).

The I, SDN interface 10 and the codec 8 mentioned above are connected to an exchange switch 14,
The operation of the exchange switch 14 is controlled by a main CPU 15 of a central control system.

RAM connected to main CPU 5 (exchange RA
M) 16 and ROM 17, the former is for storing and retaining such data as used extension terminal type information when information indicating the type of extension terminal is input according to a terminal type setting program as described later. area has been set. The latter, that is, the ROM 17, stores various control programs that allow the main CPU 15 to control the entire device, including the above programs. In the device of this embodiment, the main CPU 15 Sometimes, an extension terminal capable of communicating with the other party terminal uses information from the CPU II about the type of the other party terminal based on the received higher layer compatibility information element and the above-mentioned extension terminal type information stored in the RAM 16. It also controls the transmission of a calling signal to the terminal via the exchange switch 14 (see FIG. 4).

As shown in the figure, a highway (communication path) 29 is connected to the exchange switch 14, and the highway 29 has a plurality of subscriber numbers ("757-6242" in the illustrated example) that the user has. "757-6243" is set for each extension interface port 18.
-1.18-2゜18-3. ... is connected to the internal extension interface 19. Taking each extension interface port, for example, extension interface port 18-1, this is extension interface 19-1a-1.
9-1c, CPU20-1%R for extension interface
It is composed of an AM 21-1 and a ROM 22-1, and is configured to connect a plurality of extension terminals through an extension transmission line 23 via each extension interface 19-1a to 19-1c.

Other extension interface ports 18-2.18-3゜・
... has a similar configuration.

In this embodiment, the extension terminal is a WL telephone facsimile (G3).

That is, on the extension interface board 18-1 side,
Two extension terminals, a telephone 24 and a facsimile 26, accommodated in extension "6242" are set, and
Extension "62" is installed on the extension interface board 18-2 side.
43" telephone 25, facsimile 27.2
A total of three extension terminals (8) are set up.

Although not shown, extension interface port 1
Similarly, for 8-3 and below, a plurality of extension terminals can be individually connected to a predetermined extension number.

Hereinafter, the case of receiving a call from the analog network 1 in FIG. 1 will be described as a comparative example, and a more specific explanation will be given with reference to FIGS. 2 to 6.

FIG. 2 is a flowchart for setting the type of terminal accommodated in an extension, FIG.
The flowchart of the operation when receiving a call from 5DN2 is shown in the fifth section.
Each figure shows a flowchart of the operation when a call is received from an extension, and FIG. 6 shows the details of the profile expression method for identifying the higher layer characteristics of the 15DN service.

Hereinafter, detailed explanations of various operations will be given in accordance with the order of each of these figures.

[Setting terminal type] When connecting a new extension terminal or changing the type of extension terminal, the extension operator must selectively select a specific extension terminal corresponding to the type using the program processing shown in Figure 4 and below. In addition, in order to perform automatic call control, in the case of the above-mentioned new connection or change, it is necessary to register the type of extension terminal as follows, for example.

To describe the operating force method according to Fig. 2, after connecting the extension terminal (step 201), the operator first uses the numeric keypad of the extension terminal and presses the "*" key twice as "tree" and "*". Press the button to make the main device send the PB double signal. As a result, the answer to step 202 is Yes, so the mode is switched to terminal type setting mode (step 203). Thereafter, 7 bits of data are input using the rQJ key and rlJ key based on the profile expression method for high layer characteristic identification specified in CCI TT Recommendation 1.451 (Figure 6) (step 204). .

For example, in the case of a facsimile (G3), "0000100"' is input as shown in FIG.

The input data is thus stored in the extension terminal characteristic identification address of the exchange RAM 16 (step 205).
). In this example, if the type registration is not performed, that is, if the answer to step 202 is NO and the process proceeds to step 206, the phone profile "'0000001" (Fig. 6) is stored as a default value in the register in the main device. (see column 1 from the top), and there is no need to perform registration work for telephones that are likely to be used frequently as extension terminals.

[Operation when receiving a call from analog network]

The details regarding this are as follows.

Normally, as a means for a terminal other than a telephone to access an exchange extension terminal, use of a dial-in service is considered, so in this embodiment, a case where a call is received at a dial-in number will be considered.

In the case of an incoming call from analog network I, the type of terminal at the other end cannot be identified, so the operation is the same as in the case of a conventional exchange.

That is, now, for example, the facsimile of the other party's terminal is '7.
57-6242" and a dial-in call is received (step 301), the exchange transmits a calling signal to the extension terminal after a normal sequence of exchanges with the terminal equipment (step 302). here,
As shown in FIG. 1, the telephone 24 and facsimile 26 are connected as extension terminals corresponding to "757-6242", so in this case, the telephone 24 and facsimile 26 ring simultaneously (step 303).

If, in this case, the extension terminal operator takes the telephone 24 off-hook (step 304), the operator will press '10' to put the telephone 24 on hold as the facsimile sound is heard.Steps 305 and 306 ),
The other person or the operator himself presses "10" on the numeric keypad of the facsimile 26 to capture the held call (step 307), thus starting communication between the facsimile machines (step 308).

In this way, when the device is ringing, it may not be possible to determine the identity of the calling terminal, and as a result, the caller may respond with a different type of extension terminal, as described above. A transfer operation such as this will be required.

However, in the case of an incoming call from 15DN2, the user can be relieved from the above-mentioned work by operating the extension terminal.

This is as follows.

[Incoming call from ISDN] For comparison with the above, we will consider the case where a call is received from 15DN2 by dialing in to "757-6242", similar to the previous example of receiving a call from analog network I.

In FIG. 4, when a call is received from the other party's terminal (step 40
I) The exchange CPU 11 that received the call setup message,
High layer compatibility information elements in the message are identified (step 402).

In other words, in this case, for example, if the other party's facsimile (G3) dials '757-6242', then the exchange
The interface CPU 1 identifies the high layer compatibility information element "0000100" (FIG. 6) and recognizes that the other party's terminal is a 03 (G2) facsimile.

Therefore, in the exchange 3, this partner terminal information is sent to the main CPU 15, and compared with the extension terminal type information previously stored in the extension terminal characteristic identification address of the exchange RAM 16 according to the procedure shown in FIG. 2 described above (step 403). ). As a result, in this case, since facsimile 26 exists as an extension terminal for "757-6242", that is, as an extension terminal that can communicate with the other party's facsimile, among the extensions corresponding to "757-6242", , is identified as a facsimile (step 404), and since the answer to step 404 is Yes, the exchange switch 14 operates from step 405 onwards, sending a call signal to a communicable extension terminal, ringing the extension terminal, responding, Each procedure for starting communication is executed (steps 405 to 409).

That is, by operating the exchange switch 14, a calling signal is sent to the facsimile 26, and based on this, the facsimile 2
6 will ring, and in response, communication will begin. In this case, only the facsimile 26 rings, and the telephone 24 does not ring even in the same case as in the analog network described above. Therefore, if the terminal operator
It is possible to confirm that the 4th side responds.

In this way, the operator no longer has to perform the task of determining the type of the other party's terminal and then transferring the data to an extension terminal that can communicate with the other party's terminal, which can be done quickly and without reducing line efficiency. In addition, communication can be started while eliminating errors associated with transfer.

Furthermore, if the facsimile 26 is set to the automatic call receiving mode, the extension operator does not have to perform the -hang/receive operation.

In addition, if there are multiple terminals of the same type as extension terminals, for example, in the case of the terminal corresponding to "757-6243" in Figure 1, all the terminals of the same type will ring, and the extension operator will be able to select the terminal that rings. A response will be made using one of these, but in this case, communication is possible at that point and there is no need to perform the transfer operation.

Also, the received higher layer compatibility information element and RAM1
If it is determined that there is no terminal that can communicate in the comparison of extension terminal information in step 6, that is, if the answer in step 404 is NO, in this program example, the l5DN interface sends a disconnection message to the network and terminates the call. (step 41O).

The above control processing can also be applied to communication between extension lines.

FIG. 5 is an example.

[When receiving a call from an extension] As an example of communication between extensions, communication from facsimile 25 to facsimile 26 in FIG. 1 will be considered here.

As mentioned above, for "757-6242", extension 62
42, but extension 624 for “'757-6243”
3 are assigned to each of them, in this case, the facsimile 25 must call the facsimile 26.
6242” (step 501).
).

Next, in step 502, when the main CPU 5 identifies that the originating terminal is a facsimile machine using the exchange RAM via the extension interface CPU 20-2, it determines whether there is a facsimile machine on the extension 6242 (step 503); in this case, Since the answer is Yes, the process similar to the case shown in FIG. 4 is executed below. That is, by operating the exchange switch 14, the calling signal is changed to "62".
42", a calling signal is sent only to the facsimile 26 (steps 405 and 406). As a result, only the facsimile 26 rings, and a response and communication start are executed (steps 506 to 507). ).

In this case as well, the extension operator does not have to perform any reception work.

In this case, if the answer to step 503 is No, an alarm signal is sent to the facsimile 25 on the extension 6243, and then call cancellation control is performed (steps 509 and 510).

The above description has been made regarding the time of incoming call, but in the device of this embodiment, the following processing is performed when making a call from the extension terminal to 15DN2.

[When making a call from an extension terminal to l5DN] When making a call to l5DN2, call internal Ali! When a terminal is dialed, the type of the extension terminal that made the call is identified from the extension terminal information stored in the exchange RAM 16. in this case,
The main CPU 15 connects the calling terminal to the 15DN 2 station line using the exchange switch 14, and then connects the 15DN interface C.
Send the identified extension terminal type information to the PUII. Thus, based on this, the 15DN interface IO will send a value corresponding to the calling extension terminal in the higher layer compatibility information element in the call setup message.

In this way, in addition to the above-mentioned advantages, the electronic switching device having the configuration shown in Figure 1 also allows accurate transmission as a high-layer compatibility information element even in transmissions to the I5DN from terminals that do not have an I5DN interface. It becomes possible to send out the same data.

Therefore, it is of course possible to perform the same processing as described above on the electronic switching device side having the configuration shown in FIG. 1 on the user side of the terminal when this is received by the receiving side function, for example.

Although the present invention has been described above with reference to specific embodiments, the present invention is not limited thereto, and may be implemented as follows, for example.

[Embodiment 2] In the first embodiment described above, no specific format was defined for the extension transmission method.

However, in the case of an exchange or the like where terminals having an I5DN interface are often connected to the extension, it is also possible to make the extension interface similar to the I5DN interface. In this case, when communicating from one extension to another or from one extension to the 15DN, the higher layer compatibility information element sent from the extension terminal should be used without using the extension terminal type information stored in the exchange RAM 16. is also possible.

[Embodiment 3] Furthermore, in the description of the first embodiment, a dialing method is used for incoming calls to an extension. However, receiving calls to extensions does not have to be limited to the dial-in method;
It is also possible to use subaddresses.

[Embodiment 4] Furthermore, in the first embodiment, the method of setting the terminal type using the numeric keypad of the extension terminal was explained as an example, but it is also possible to use a switch provided on the extension interface of the exchange, etc. It is.

[Embodiment 5] Furthermore, in the first embodiment, only a telephone and a facsimile (G3) are listed as extension terminals, but any terminal specified by CCITT Recommendation 1.451 can be used. Similar effects can be expected.

[Embodiment 6] In addition, in the first embodiment, when there is no communicable extension terminal corresponding to the number in response to an incoming call from l5DN, a disconnection message is sent to the network, but communication is not made to the extension terminal corresponding to the number. If there is a capable terminal, it is also possible to make settings in advance to connect to that terminal.

(Effects of the Invention) According to the present invention, an interface capable of connecting to an rsDN, a means for receiving a high layer compatibility information element,
Since the system has a means for calling an extension terminal capable of communicating with a partner terminal whose type is identified based on the received higher layer compatibility information element, the extension operator does not have to spend time on unnecessary transfer operations. 4. In addition, the time required for transfer is reduced, the delay in the start of communication is reduced, and as a result, more efficient use of lines can be achieved, and line usage fees are reduced at the same time. Furthermore, there is an effect that transfer errors due to transfer do not occur.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an electronic switching device showing an embodiment of the present invention, FIG. 2 is a flowchart showing an example of the procedure for setting the terminal type, FIG. 3 is a flowchart when receiving a call from an analog network, and FIG. The figure is a flowchart showing an example of processing when a call is received from an 15DN, Figure 5 is a flowchart showing an example of a process when a call is received from an extension, and Figure 6 is an explanation of the profile expression method for identifying the higher layer characteristics of the 15DN service. FIG. l...Analog network, 2...l5DN, 3...exchange, lO...I SDN interface, 14...
Replacement switch, 15... Main C, PU, 16...
RAM, 24-28...extension terminal. 'A4 seagull

Claims (1)

[Claims] 1. It has an interface that allows connection to ISDN, a means for receiving a high layer compatibility information element, and a means for calling an extension terminal capable of communicating with a partner terminal whose type is identified based on the received high layer compatibility information element. An electronic switching device characterized by: