JPS62266997A - Exchange system - Google Patents

Abstract

PURPOSE:To save the labor of a caller and to improve a service by temporarily holding a line, feeding a signal to the caller and newly transmitting another extension designating signal when a designated extension telephone set is busy. CONSTITUTION:Even when the extension telephone set 3 designated by the extension designating signal received by a PB receiver 7 is busy, a private branch exchange 1 feeds an extension designating receiving completion signal to a station exchange 2 and the exchange 2 transmits a ring tone to a called telephone system. Thereafter, the exchange 1 feeds the second response signal to the exchange 2, temporarily holds the line from the exchange 1 via 2 to the called telephone set, transmits a dial tone from a signal generator 8 to the exchange 2 and the exchange 2 feeds this dial tone to the called telephone system in place of the ring tone. The caller understands that the telephone set 3 is busy by the change of the ring tone to the dial tone and dial-inputs the extension designating signal for designating the extension telephone set 4. The exchange 1 receives it, and then sets the line to feed the ring a call signal to the telephone set 4 and feeds the ring tone to the exchange 2. When the telephone system responds, the communication state is produced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a system for exchanging dial-in services in a private branch exchange.

[Conventional technology]

Figure 3 shows, for example, the switching connection operation of the conventional switching system as shown in Document 3 of the PBX Committee (2nd Meeting Minutes, dated July 15, 1985) of the Telecommunications Machinery Industry Association Self-Employed Supplies Subcommittee. This is a sequence flow, and in the figure, 1 indicates a private branch exchange and 2 indicates a central office exchange.Furthermore, Figure 2 shows an example of a general private branch exchange equipped with a dial-in service function in which such exchange connection operations are performed. In the figure, 3.4 is an extension telephone, 5 is an exchange main body of the private branch exchange 1 that accommodates these extension telephones 3 and 4, and 6 is a central exchange housed in the exchange main body 5. 2 is a central office line trunk to which a central office line is connected; 7 is a PB receiver housed in the exchange main body 5; and 8 is a signal tone generator.

Next, the operation will be explained. The private branch exchange 1 detects that the call from the central office exchange 2 has arrived at the central office line trunk 6 and that the polarity of the central office line has been reversed, and receives the ringing signal. and returns the primary response signal to the central office exchange 2, and connects it to the line '1rPB receiver 7. Subsequently, a message is sent from the central office exchange 2 to designate, for example, an extension telephone 3. When the PB receiver 7 receives an extension designation signal based on the pushbutton dial signal, the private branch exchange 1 disconnects the DC loop and sends an extension designation reception completion signal to the central office exchange 2.
The line is set up by a predetermined exchange connection operation, and the P
The extension telephone 3 designated by the extension designation signal received by the B receiver γ is called.

The central office exchange 1 sends a ring tone to the calling party's telephone. When the extension telephone 3 responds, the private branch exchange 1 again forms a DC loop and returns a secondary response signal to the central office exchange 2, and connects the extension telephone 3 to the caller's telephone to establish a conversation state.

On the other hand, if the extension telephone 3 is busy, the private branch exchange 1 stops sending back the extension designation reception completion signal, or the call is received by a relay stand, talkie device, etc. (not shown), and the designated extension is received. Notify me that the extension telephone 3 is busy.

[Problem to be solved by the invention] Since the conventional exchange system is configured as described above, is it possible to solve the problem within the specified range? If the ts telephone is busy and you make a call to another extension telephone housed in the same private branch exchange, you will need to perform the call operation again or have the call connected via a relay stand, which is time-consuming. There was a problem with bending.

This invention was made in order to solve the above-mentioned problems, and it provides a switching system in which when a designated extension telephone is busy, an extension designation signal can be subsequently received to designate another extension telephone. The purpose is to obtain.

[Means for solving problems]

The switching system according to the present invention temporarily puts the line on hold even if the specified extension telephone is busy.

After making a call, a signal is sent to the telephone with a reminder push button to permit it to send an extension designation signal again, and an exchange processing operation fc is carried out based on the returned extension designation signal.

[Effect]

A subscriber who makes a call from a push-button telephone according to the present invention will receive a call if the designated extension subscriber is busy.

A signal will be sent to allow the transmission of the extension designation signal again, so if you wish to talk to a subscriber of another telephone extension housed in the same private branch exchange, you can now transmit the extension designation signal to that extension telephone. If a specified signal is sent, a call can be made if the extension telephone is not busy.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows a sequence 70- showing the exchange connection operation of the conversion method according to an embodiment of the present invention.

In the figure, 1 indicates a private branch exchange, and 2 indicates a central office exchange.

As in the conventional case, this is performed by a general private branch exchange with a dial-in service function as shown in FIG.

Next, the operation will be explained. The incoming call to the extension telephone 3 or 4 which is not busy is the same as in the conventional case, so the explanation will be omitted.

Even if the extension telephone 3 designated by the extension designation signal received by the PB receiver 7 is busy, the private branch exchange 1 sends an extension designation reception completion signal to the central office exchange 2.

The central office exchange 2 sends a ringing tone to the telephone that made the call.

After that, the private branch exchange 1 sends a second response signal to the central office exchange 2, temporarily holds the line from the private branch exchange 1 to the telephone that made the call via the central office exchange 2, and then outputs the dial tone from the signal generator 8. is sent to the central office exchange 2, and the first central office exchange 2 sends this dial tone instead of the ringing tone to the telephone that made the call. At this time, the private branch exchange 1 connects the line f to the FB receiver 7 and prepares to receive the primary extension designation signal. When the ring tone changes to a dial tone, the caller knows that the previously specified extension telephone 3 is busy and presses the telephone button to specify the extension telephone number 4 with which he or she wants to make the next call. Input from button dial. If there is no other party to talk to within the same private branch exchange 1, the calling party goes on-hook and ends the call. When the private branch exchange 1 receives the extension designation signal, it sets up the line by performing a predetermined exchange connection operation, sends a ringing signal to the designated extension telephone 4, and stops dialing and outputs a ringing tone to the central office exchange 2. Send. When the extension telephone 4 answers, it stops sending out the ringing tone and the ringing signal and enters into a talking state.

Furthermore, if the extension designation signal cannot be received within a certain period of time, the private branch exchange 1 performs a process of disconnection as an abandonment.

In the above embodiment, after the secondary response signal.

Although the dial tone is immediately transmitted, the busy tone may be transmitted for a certain period of time and then the dial tone may be transmitted, and the same effect as in the above embodiment can be achieved.

〔Effect of the invention〕

As described above, according to the present invention, when the designated extension telephone is busy, the line is temporarily put on hold and a signal is sent to the caller, and another extension designation signal can be sent again. Even if your extension is busy, other extensions housed in the same private branch exchange may be busy. A call can be made by simply transmitting an extension designation signal to the ST telephone set, which saves time and effort on the part of the caller and provides a switching system that can provide better service.

[Brief explanation of the drawing]

FIG. 1 is a sequence 70 diagram illustrating the exchange connection operation of an exchange method according to an embodiment of the present invention, and FIG. 2 is an example of a general private branch exchange equipped with all dial-in service functions in which the exchange connection operation is executed. FIG. 3 is a sequence flow diagram showing the switching connection operation of the conventional switching system. 1 is a private branch exchange, 2 is a central office exchange 23, 4 is an extension subscriber,
6 is a central office line trunk, γ is a PB receiver, and 8 is a signal tone generator. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent Applicant: Mitsubishi Electric Corporation Figure 1 2: Scrap exchange ¥ (micro Figure 2 3 Extension i1 talk charge/4, Extension courier language area Figure 3 1 Private branch exchange area. 2 Near fake text exchange, ( Raft

Claims (1)

[Claims] In a private branch exchange capable of providing dial-in service, when a call from a push-button telephone arrives at the private branch exchange from the central office exchange, even if the extension telephone called by the call is busy, the private branch exchange A line leading to the pushbutton telephone via the central office exchange is temporarily put on hold, and a signal is sent from the private branch exchange to the pushbutton telephone via the put on hold to permit the transmission of an extension designation signal again. The switching method is characterized in that the switching connection operation is executed based on the extension designation signal sent back in response to the extension designation signal.