JPS63229953A - Calling device - Google Patents

Abstract

PURPOSE:To attain a trunk line call without any fail without inputting the designation of pause in storing a telephone number by receiving a signal detecting a call tone from a station exchange and sending a selection signal of a destination. CONSTITUTION:A destination designation section 1 outputs a destination signal 21 designating a destination and a control signal 22 indicating the closing of an input terminal equipment of a line 7 by switch operation. A selection signal generating section 2 receives a destination signal 21 and sends a 1st selection signal 23 to connect the line 7 stored in advance to the station exchange 6. On the other hand, a network control section 3 receives the control signal 22 to close the input terminal of the line 7 and to send the 1st selection signal 23 and connects the line 7 to a trunk line 8 by a private branch exchange 5. A call tone identification section 4 identifies a call tone 25 from the station exchange 6 successively and when the section 4 identifies the call tone, it outputs a call command signal 26 to send a 2nd selection signal 24 to the line 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a calling device, and more particularly to a calling device that transmits a destination selection signal to a central office exchange via a private branch exchange.

[Conventional technology]

Recent telephones and various terminal devices with built-in telephone functions,
For example, a facsimile machine is a calling device that stores a telephone number for a destination in advance and sends out a selection signal for the stored telephone number when the destination is specified using a single operation switch or speed dial switch. There are some that have the following. FIG. 2 is a block diagram of an example of a conventional calling device.

When the destination designation unit 11 specifies a destination by operating a switch, it outputs a destination signal 31 instructing selection of the destination telephone number and a control signal 32 instructing closure of the input end of the line 7. The selection signal generating section 12 stores the telephone number of the destination in advance, receives the destination signal 31, and outputs the selection signal 33 of the stored telephone number. The network control section 13 is connected to the line 7, receives the control signal 32, closes the input end of the line 7, and issues a selection signal 33 to the line 7. At this time, the central office switch 6
When calling the selection signal 33 to the
Send a selection signal of ``0'' to the destination, connect line 7 to central office line 8, wait for 3 to 4 seconds (hereinafter referred to as pause) after not calling ``0'', and send a selection signal of the destination. Make a call.

[Problem that the invention seeks to solve]

In the conventional calling device described above, when storing the selection signal 33 of the destination to be called to the central office exchange 6 in the selection signal generation section 12, the pause designation is input after inputting the selection signal of "0". The procedure is troublesome, and if you forget to specify the pause, part of the selection signal 33 sent by the private branch exchange 5 while switching the line 7 to the central office line 8 may be missing and the call may fail. There is a problem with calling the wrong destination.

SUMMARY OF THE INVENTION An object of the present invention is to provide a calling device that can issue a correct destination selection signal to a central office exchange via a private branch exchange.

[Means for solving problems]

The calling device of the present invention includes a destination specifying section that outputs a destination signal for specifying a destination by switch operation and a control signal for instructing closing of an input end of a line, and a destination specifying section that outputs a destination signal for specifying a destination by a switch operation, and a control signal for instructing closing of an input end of a line; a selection signal generation unit that sends a first selection signal instructing the exchange to connect and outputs a pre-stored second selection signal specifying a destination when receiving the call origination instruction signal;
a network control unit that closes the input end of the line according to the control signal, sends out the first selection signal, relays a dial tone from the central office exchange, and sends out the second selection signal to the line; and a dial tone identifying section that identifies the dial tone from the network control section and outputs the call instruction signal.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

The destination specifying unit 1 receives a destination signal 21 for specifying a destination by operating a switch, and a control signal 2 for instructing the closing of the input end of the line 7.
Outputs 2. Upon receiving the destination signal 21, the selection signal generating section 2 sends out a first selection signal 23 instructing the central office exchange 6 to connect the line 7 stored in advance, and when receiving the calling instruction signal 26. A second selection signal 24 is sent out. Upon receiving the control signal 22, the network control unit 3 closes the input end of the line 7, issues a first selection signal 23, connects the four-line line 7 to the central office line 8 through the private branch exchange 5, and connects the four-wire line 7 to the central office line 8. The dial tone 25 (continuous signal with a frequency of 400 Hz) from the exchange 6 is relayed and output, and the second selection signal 24 is issued to the line 7. The dial tone identification section 4 identifies the dial tone 25 from the central office exchange 6 and outputs a call instruction signal 26.

In this way, the selection signal generating unit 2 first sends the first selection signal 23 (corresponding to the RO number) to the horizontal switch 5 to connect the line 7 to the central office line 8, and the central switch 6 Since the destination selection signal 24 is transmitted by detecting the dial tone that permits acceptance of the destination selection signal (dial signal or MF signal), it is possible to make a call without making a mistake.

〔Effect of the invention〕

As explained above, in the present invention, when a selection signal specifying a destination is sent to a central office exchange via a private branch #li machine,
First, the private branch exchange connects to the central office exchange, and then receives a signal that detects the dial tone from the central office exchange and issues a destination selection signal, allowing the operator to memorize the telephone number. This has the effect that a call can be made without fail without inputting a pause specification when making a call.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of a conventional calling device.

Claims (1)

[Claims] a destination specifying section that outputs a destination signal for specifying a destination by switch operation and a control signal for instructing the closing of the input end of the line; and a destination specifying section that receives the destination signal and instructs the central exchange to connect the line to the central exchange. a selection signal generating section that sends out a selection signal of one selection signal and outputs a pre-stored second selection signal specifying a destination when receiving a call instruction signal; a network control unit that transmits the first selection signal, relays and outputs the dial tone from the central office exchange, and sends the second selection signal to the line; 1. A calling device comprising: a dial tone identification section that outputs a call instruction signal.