JP2715632B2 - Switching communication control system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to terminal switching used in a communication system configured by branching and connecting an analog telephone and an analog facsimile as a communication terminal device to a digital multiplex communication line. Related to the device.

[Prior Art] Recently, with the development of telephone technology, a digital multiplex communication network that transmits and receives digital signals in place of conventional analog signals to perform communication has been developed and used. When a conventional analog facsimile apparatus and an analog telephone set that perform communication by transmitting and receiving an analog signal as a communication terminal apparatus to one line of such a communication network are used by switching, the digital Even if a means for converting a signal to an analog signal is installed in the line, an analog facsimile outputs a tone signal of 2100 Hz as a response signal and makes a determination, but an analog telephone does not return such a signal, Since such a determination cannot be made, it cannot be determined whether the call destination is a telephone or a facsimile.

Therefore, depending on the switching setting of the communication line, there is a possibility that a facsimile responds when the call destination is a telephone, or that the telephone responds when the call destination is a facsimile.

[Problem to be Solved by the Invention] The present invention is proposed in view of the above circumstances, and a terminal capable of automatically selecting and using a conventional analog telephone and a facsimile by branch connection even in a digital multiplex communication network. The aim is to propose a switching device.

[Means for Solving the Problems] The present invention is proposed to achieve the above object, and an analog telephone and a facsimile device can be selectively connected to a digital multiplex communication line as communication terminal devices. A terminal switching device for connecting a communication terminal device determined based on a hook signal from an analog telephone or a facsimile device to a digital multiplex communication line when calling, and indicating a type of the communication terminal device. A call discrimination means for transmitting a sub-address to a receiving side through a digital multiplex communication line; and, upon receiving a call, receiving a sub-address indicating the type transmitted from the calling side through the digital multiplex communication line, and determining based on the type. Incoming call determining means for connecting the communication terminal device to the digital multiplex communication line.

Such a device of the present invention is easily constituted by a computer system, and the call discriminating means is a communication terminal which has called the communication terminal device based on the presence / absence of a hook signal output by the communication terminal device on the calling side prior to calling. The incoming call discriminating means decodes the subaddress added to the multiplexed signal transmitted through the multiplex communication network from the calling side prior to the incoming call at the time of the incoming call, and determines the type of the device. The type of the communication terminal device can be determined.

[Operation] According to the terminal switching device of the present invention, the following communication control is possible. If either a facsimile or a telephone connected to one end of the digital multiplex communication line as a communication terminal device outputs an off-hook signal or an on-hook signal for making a call, the call discriminating means detecting the hook signal causes a call line switching. Activating the means to switch and connect the communication line of the communication terminal device that has output the hook signal to the digital multiplex signal line, and the sub-address adding / determining unit is assigned in advance in accordance with the type of the calling communication terminal device. The tag is designated as a sub-address and is sent out to the multiplex line as additional information of the multiplex signal, so that the other party receiving the multiplex signal decodes the tag to determine the type of the communication terminal device of the caller.

In addition, at the time of an incoming call, the tag specified by the subaddress transmitted as additional information from the calling side is determined by the incoming call determining means, and the call line switching means is activated by the determination signal. , The facsimile is connected to the receiving side, and when the calling side is a telephone, the telephone is also connected to the receiving side.

Embodiment Hereinafter, an embodiment of the terminal switching device of the present invention will be described.

FIG. 1 is a block diagram showing the configuration of a main part of a terminal switching apparatus according to the present invention, and an ISDN network is assumed as a digital multiplex network.

Such an ISDN network has a plurality of information channels and signal channels in one subscriber line, and one end of the network is provided with an ISDN communication control unit.

Here, the outgoing call determining means and the incoming call determining means are the CPU 1,
A communication line switching means 6 comprising a subaddress addition / determination unit 2, a hook signal detection unit 3, and a communication line switching unit 6, and connected to the ISDN communication control unit 4 via a PCM codec conversion unit 5.
The telephone line 11 connected to the telephone 7 and the telephone line 12 connected to the facsimile 8 are branched and connected.

Here, the ISDN communication control unit 4 performs control necessary for digital multiplex communication, and the PCM codec conversion unit 5 converts a digital signal and an analog signal, and is transmitted from the ISDN communication control unit 4 in the form of a digital signal. The operation of converting the received signal into an analog signal and converting the analog signal transmitted from the analog communication terminal device 7 or 8 into a digital signal is performed.

Hook signal detecting section 3 detects an on-hook signal or an off-hook signal output prior to the calling operation of communication terminal apparatus 7 or 8 connected to communication line switching means 6 and
Sends a signal to CPU1. The CPU 1 decodes the on-hook signal or the off-hook signal detected by the hook signal detecting unit 3, outputs a switching signal to the communication line switching unit 6, switches the control contact of the communication line switching unit 6, and outputs a hook signal. Side communication terminal device 7 or 8 is connected to PCM codec conversion unit 5.

Further, when the CPU 1 decodes the hook signal and operates the sub-address adding / determining means 2, the sub-address adding / determining means 2 adds the sub address of the multiplexed signal generated by the ISDN communication control section 4 to the communication terminal device 7 on the calling side. Alternatively, a tag corresponding to the type of 8 is specified.

Thus, the communication line 1 corresponding to the communication terminal device on the calling side
Alternatively, l2 is connected to the digital multiplex line lS, and the ISDN communication control unit 4 converts the signal in which the tag indicating the type of the communication terminal device on the calling side is specified in the sub-address transmitted as additional information to the digital multiplex signal. Digital multiplex line in form
Send to lS.

In such a device, when an incoming call is received, the tag specified by the subaddress added to the digital multiplexed signal by the ISDN communication control unit 4 is decoded by the subaddress addition / determination unit 2, and the CPU 1 uses the decoding result to make a call. Activate the line switching means 6 and drive the switching contact to connect the communication line 1 or l2 of the same type of communication terminal device as the call destination to the PCM.
Since the communication line is connected to the codec converter 5, the communication line is switched to an appropriate state before receiving a call.

FIG. 2 shows a format of a subaddress added to a digital multiplexed signal as an ISDN address in an ISDN communication network. In the present invention, a tag indicating the type of a communication terminal device has 0, 0 in one bit of the subaddress. Enabled by assigning one.

100 to 106 in FIG. 3 are flowcharts showing the control operation at the time of calling by the calling discriminating means.
Prior to calling, analog telephone 7 is off-hook signal
When the OH1 signal is output, 1 is assigned to the subaddress, and the analog facsimile 8 outputs the off-hook signal OH.
In this example, when two signals are output, 2 is assigned to the subaddress.

4 are flow charts showing the control operation of the incoming call discriminating means at the time of incoming call.
If the sub-address adding / determining means 2 determines that 1 has been assigned to the sub-address added to the multiplex signal received prior to the incoming call, the communication line switching means 6 is switched and connected to the telephone 7 side, and In this example, when it is determined that 2 has been assigned to the facsimile, the communication line switching means 6 is switched to the facsimile 8 side.

[Effects of the Invention] As described above, according to the terminal switching apparatus of the present invention, an existing analog telephone and a facsimile apparatus are branched and connected to one end of a digital multiplex communication network via a switching means and selectively. Can be used.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the main configuration of a terminal switching apparatus according to the present invention. FIG. 2 is a diagram for explaining the format of a subaddress added as additional information to digital multiplex communication.
FIG. 4 is a flowchart showing a procedure of an automatic calling operation of the terminal switching apparatus according to the present invention, and FIG. [Explanation of symbols] 1 ... CPU 2 ... Sub address addition / judgment unit 3 ... Hook signal detection unit 6 ... Talk line switching means lS ... Digital multiplex line 1, l2 ... Talk line 7,8 ... Analog Communication terminal device

Claims (1)

(57) [Claims] 1. A terminal switching device which can selectively connect an analog telephone and a facsimile device as a communication terminal device to a digital multiplex communication line. A call discrimination means for connecting the communication terminal device determined based on the hook signal to the digital multiplex communication line, and transmitting a subaddress indicating the type of the communication terminal device to the receiving side through the digital multiplex communication line; Receiving means for receiving a sub-address indicating the type transmitted from the calling side through a digital multiplex communication line, and connecting a communication terminal device determined based on the type to the digital multiplex communication line; Terminal switching device.