JPH0834498B2 - Digital phone - Google Patents

Description

TECHNICAL FIELD The present invention relates to a digital telephone, and more particularly to a digital telephone having a monitor function.

2. Description of the Related Art Conventionally, in this type of digital telephone, only one of a plurality of digital telephones connected to one home bus has a right to use a call channel in accordance with a signaling procedure so that a user can talk. It was

A configuration example of a conventional digital telephone will be described with reference to FIG. In FIG. 3, a key group 1 (for example, a keypad, a keyboard, etc.) for the user to input numbers, characters, etc. and a display 2 for displaying the numbers, characters, etc. to the user are connected to the control unit 3 '. The home bus interface line 4 is
It is housed in the layer 1 interface circuit 5, and the control unit 3 '
And the signal channel line 6, the switch section 14 is connected to the first call channel line 7 and the second call channel line 8, respectively. The switch unit 14 is connected to the transmitter / receiver 11 via the A / D conversion unit 10.
Connected to. The layer 1 interface circuit 5 is connected to the layer 1 control line 13 and the switch unit 14 is connected to the switch control line 12 to the control unit 3 ', respectively.

In this configuration example, by inputting information of a predetermined call request from the key group 1 when the user makes a call, the control unit 3'drives the layer 1 control line 13 to establish the layer 1 established state. After that, the call is set up via the signal channel line 6 according to a predetermined signaling procedure with the network side, an instruction of the call channel to be used is received, and the call channel line 7 or 8 is switched using the switch control line 12. A / D converter 1
The switch unit 14 is controlled to connect to the handset 11 via 0. The control operation of the control unit 3'of the conventional digital telephone set forth above can be described as a flow chart as shown in FIG.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in a call using the above-described digital telephone, only one of the plurality of terminals connected to the home bus can use one call channel. This is because if the call channel of one home bus can be used to talk to two phones, the call information in the network direction will collide from the phones, and the call information will not be transmitted on the digital bus. Two drivers drive the bus. This is because there is an electrical problem, and therefore the signal procedure does not allow this.

Therefore, the branch connection that was possible with analog telephones is impossible in principle. However, as is apparent from the above reason, it is possible in principle to monitor a telephone call from the network toward the telephone by a telephone not in communication.

A digital telephone having such a monitor function has never been considered.

The present invention has been made in view of the above-mentioned conventional circumstances, and therefore, an object of the present invention is to add another function on a home digital bus without changing the signal procedure by adding a function of connecting a communication channel to a handset. To provide a new digital telephone capable of monitoring a telephone call of the telephone.

Means for Solving the Problems In order to achieve the above object, the digital telephone according to the present invention has a means for controlling connection / release only from the network to the telephone in addition to bidirectional connection / release. A means for determining one or more key inputs and a switch for connecting to the telephone communication channel from the network to the handset and the handset at the time of determining the particular single or multiple key inputs without performing signaling procedures on the signaling channels. Control procedure.

Embodiment Hereinafter, a preferred embodiment of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a digital telephone according to the present invention, which is a conventional configuration in which a new function is added to the control section and its peripheral section shown in FIG. The same reference numbers as have the same function. In this configuration, FIG. 2 is a flowchart of the control operation of the control unit 3 of the digital telephone of this embodiment.

In FIG. 1, reference numeral 9 is a unidirectional switch unit capable of controlling connection / release only from the network to the telephone in addition to bidirectional connection / release, and 31 is a specific single or plural keys. Key input determination unit for determining input, 32
Indicates a switch control unit for controlling the switch so as to connect to a telephone communication channel and a handset in the direction from the network to the telephone without performing a signaling procedure on the signal channel when a specific single or plural key input is judged.

Next, the operation will be described with reference to FIGS. 1 and 2. In the present invention, the control unit 3 determines whether the key input from the key group 1 is a predetermined key pattern for a monitor request. Is determined by the key input determination unit 31, and if not, the same operation as that performed by the conventional control unit 3'is performed.

If the key input from the key group 1 is a predetermined key pattern for a monitor request, the switch control unit
After driving the layer 1 using the layer 1 control line 13 by 32, driving the switch unit 9 using the switch control line 12
Only the path from the network of call channels to the telephone is formed.
As a result, the call channel is connected to the handset 11, and the call channel information can be monitored.

EFFECTS OF THE INVENTION As described above, according to the present invention, the signal procedure is changed by determining the monitor request by a specific key input, omitting the signal procedure control and adding the function of connecting the communication channel to the handset. Without this, it is possible to monitor the call of another telephone on the home digital bus.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a digital telephone according to the present invention, FIG. 2 is a flow chart showing a control operation of a control unit of the digital telephone according to the present invention, and FIG. 3 is a block of a conventional digital telephone. FIG. 4 is a flow chart showing the control operation of the control unit of a conventional digital telephone. 1 ... key group, 2 ... display, 3 ... control section, 31
...... Key input determination unit, 32 ...... Switch control unit, 4 ...... Home bus interface line, 5 ...... Layer 1 interface circuit, 6 ...... Signal channel line, 7 ...... First call channel line, 8 ...... Second call channel line, 9 ... One-way connectable switch section, 10 ... A / D conversion section, 11 ... Handset, 12 ... Switch control line, 13 ... Layer 1 control line, 14
...... Switch section

Claims (1)

[Claims] 1. An interface with a home digital bus capable of connecting a plurality of terminals, which is connected to a call channel and a signal channel through the interface, and connects the call channel and a handset according to a signal procedure on the signal channel. And a digital telephone for controlling a switch for releasing, in addition to bidirectional connection / release, means for controlling connection / release only from the network to the telephone, means for determining a specific single or a plurality of key inputs, and the specific By providing a means for controlling the switch so as to connect the telephone handset channel from the network to the handset without performing the signaling procedure on the signal channel when determining the single or multiple key input of A digital telephone having a function of monitoring a call channel when a plurality of keys are input.