JPS60162367A - Calling system of busy called subscriber after ring-off - Google Patents

Abstract

PURPOSE:To call a called subscriber by keeping a calling subscriber waiting until a busy called subscriber is set in a ring-off state and an extension becomes idle. CONSTITUTION:The subscriber of an extension telephone 3 is set in an off-hook state and wants to have a call to an extension telephone 2. Under such conditions, a central controller 8 controls an originating register/each signal tone transmission circuit 10 as long as the subscriber of the telephone 2 is kept busy. Then the subsequent busy tones are transmitted to set a flag which is kept waiting at a memory element 9. The controller 8 monitors the state transition of a calling subscriber for each prescribed time and decides whether or not a waiting flag is is turned on. If this flag is turned on, it is decided whether or not the subscriber of the telephone 3 hooks off the handset. If the subscriber is kept waiting, the monitor processing is started for the state transition of the called subscriber.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a service function in an automatic telephone exchange for a calling party when the called party is busy.

[Background Art] Conventionally, in automatic telephone exchanges, when the called party is busy,
Even though the caller's extension was empty, the caller kept hearing a busy tone. There was no way to automatically monitor the status transition of a person's extension, and the following operations were required.

First, there is a system in which the caller hangs up the phone and dials the called party's phone number again, but this method is time-consuming compared to the service functions of many other telephone systems to date. -It was very troublesome.

Next, there is another type of telephone function called Camp On, which is a wonderful feature that automatically calls the caller and called party by dialing a special A number after hooking up. However, unfortunately, due to the complexity of its operation, it is currently not used by many users.

Furthermore, the function of interrupting a call when a call is busy requires a complicated operation similar to the above-mentioned camp-on, and is usually regulated due to the risk of eavesdropping due to interference.

Next, there is a feature called Step Call, which is easy to use as it only requires one dial operation, but the caller cannot contact the person he or she originally wanted to talk to. Moreover, just because the extension numbers are close together does not necessarily mean that they are close to each other, and therefore the caller cannot reach the person they wanted to talk to. There were times when I failed.

Furthermore, due to the nature of humans handling telephones, it is thought that the caller listens to the ring tone (RBT) approximately 10 times (that is, approximately 30 seconds) and waits for the other party to answer. is considered to allow listening to busy sounds for about 30 seconds. Therefore, in conventional automatic telephone exchanges, even if the calling party finishes dialing the telephone number of the called party and the called party's central line becomes empty immediately thereafter, the calling party cannot Unless you use one of these tedious phone operations, you will continue to hear the busy tone forever. Therefore, as mentioned above, the characteristic of waiting for about 30 seconds, which is the acceptable time for humans to hear the busy tone, has not been effectively utilized.

[Object of the Invention] The present invention provides means for automatically monitoring state transitions of both a calling party's extension and a busy called party's extension, that is, a calling party listening to busy tone; When the called party finishes the call,
By having a means to automatically monitor the state transition that the extension has been restored without any special operation on the part of the caller, the above drawback can be solved. To provide a system for calling a busy called party after the call ends, by which the called party who is busy can be called when the extension line becomes empty.

[Structure of the Invention] The calling method of the present invention is such that when the called party is busy in an automatic telephone exchange, the caller's extension that is listening to the busy tone,
In response to this, a means is provided to monitor the state transition of both the extension of the busy called party, and the calling party remains on standby until the called party ends the call and the extension becomes empty. The calling party is characterized in that the calling party can automatically call the called party via the called party's extension which becomes vacant after the call ends.

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

FIG. 1, FIG. 2, and FIG. 6 are simplified diagrams showing the transition of the relay system according to an embodiment of the present invention. In Figures 1 to 6, 1, 2.3 are extension telephones, and 4 is a main switch.

According to FIG. 1, when both subscribers are talking using extension telephones 1 and 2, when the subscriber of extension telephone 3 picks up the handset and dials the telephone number of extension telephone 2, the subscriber of extension telephone 6 is subscribed. The user hears busy tone (BT). Therefore, the subscriber of extension telephone 3 becomes the calling party, and the subscriber of extension telephone 2 becomes the busy called party. Here, the call between the subscribers of extension telephones 1 and 2 is terminated using the means of the present invention for automatically monitoring the state transitions of the caller listening to the busy tone and the busy called party as described later. In other words, when the called party's extension becomes empty, the caller using extension telephone 6 hears the ring tone (RBT), and the called party's extension telephone 2 receives a ringing sound, as shown in FIG. A signal (RG) is sent out. Next, when the called party using the extension telephone 2 answers, a telephone call is established between the caller using the extension telephone 6 and the called party using the extension telephone 2, as shown in FIG.

Next, the hardware configuration of the present invention and the means for automatically monitoring the state transition of the caller listening to the busy tone and the called party while the caller is busy will be explained in detail with reference to the drawings. FIG. 4 shows the hardware configuration of the present invention (only the parts necessary for explaining the present invention and the rest are omitted), 1.2.3
is an extension phone.

5.6.7 is a subscriber circuit, 4 is a main switch, 8 is a central control unit, 9 is a storage element (including a program memory and a continuous write memory), and 1o is a transmission register and various signal sound transmission circuits (hereinafter referred to as (abbreviated as oscillation register etc. circuit)
, 11 is a calling signal generation circuit. As described above, the configuration of FIG. 4 is similar to that of a conventional general exchange.

FIGS. 5 and 6 are examples of flowcharts of call processing and state transition monitoring processing of the calling party and the called party in the present invention.

Next, detailed operation of the present invention will be explained with reference to FIGS. 4 to 6. When the extensions of extension telephones 1 and 2 are empty, and the subscriber of extension telephone 1 wants to call the subscriber of extension telephone 2, the main line "f4" is called by the well-known subscriber's operation and the operation of the automatic telephone exchange. The subscriber circuits 5 and 6 are connected, and both subscribers on extension telephones 1 and 2 are busy.

At this time, when the subscriber of the extension telephone 3 hangs up the handset and goes off-hook, the central control unit 8 detects this via the subscriber circuit 7 and controls the main switch 4 to connect the calling register etc. circuit 10. connection circuit 7. As a result, a dial tone is transmitted from the call register etc. circuit 10 to the extension telephone 6.
Further, when the subscriber hears this tone and wants to talk to the subscriber on extension telephone 2, he dials the telephone number. The dialed number is then sent to subscriber circuit 7.
The signal is stored in the transmission register circuit 10 via the main switch 4 and the transmission register circuit 10. As a result, the subscriber of the extension telephone 6 becomes the calling party, and the subscriber of the extension telephone 2 is determined as the called party based on the outgoing dial information (operation step 81).

The central control unit 8 inputs this dial information from the calling register etc. circuit 10, registers it in the memory element 9, and then scans the called party subscriber circuit 6 in accordance with this dial information (S2). Based on this, it is determined whether the called party, ie, the subscriber of extension telephone 2, is busy (S3).

At this time, if the subscriber of the extension telephone 2 has already put the handset on the hook or the like and is not already talking with the subscriber of the extension telephone 1, the central control unit 8 uses the extension telephone 6 stored in the storage element 9. Clear the caller waiting flag for
6) Thereafter, the main switch 4 is controlled to connect the calling register etc. circuit 10 to the subscriber circuit 7, and the subscriber circuit 6 is controlled to connect the calling signal generation circuit 11 to the extension telephone 2, respectively. As a result, from the transmission register etc. circuit 10 to the main switch 4,
A ring tone is sent to the handset of the extension telephone 6 via the subscriber circuit 7 (S7), and a ring signal is sent from the ring signal generation circuit 11 to the extension telephone 2 (S8), thereby starting the call process. End (S tO).

On the other hand, at this time, if the subscriber of extension telephone 2 is busy with the subscriber of extension telephone 1 as described above, central control unit 8 controls circuit 10 such as a call register, and then transmits the busy tone to the main switch. f4. It is sent to the handset of the extension telephone 6 via the subscriber circuit 7 (S4), sets the caller waiting flag in the storage element 9 (S5), and ends the call processing (S4).
S tO>.

Next, at predetermined time intervals, the central controller 8 performs caller state transition monitoring processing according to the program.

The central controller 8 starts the caller state transition monitoring process (5ll) and determines whether the caller standby flag in the storage element 9 is turned on (S12).

Here, if the caller standby flag is cleared, the central controller 8 ends the caller state transition monitoring process (81
6).

On the other hand, if the caller standby flag is ON, the central control unit 8 scans the caller subscriber circuit (813), for example, scans the subscriber circuit 7 in the caller.

Thereby, the central controller 8 determines whether the caller, for example, the subscriber of the extension telephone 6 in this case, has taken the handset off-hook (S14). Here, when the caller has already put the handset of the extension telephone 6 on-hook, the central control unit 8 detects this via the subscriber circuit 7 and stops the transmission of a busy tone from the call register etc. circuit 10. In addition, the caller waiting flag of the extension telephone 6 in the storage element 9 is cleared (815), and the caller state transition monitoring process is ended (S16).
. On the other hand, if the caller listens to the busy tone from the calling register etc. circuit 10 and waits with the handset of the extension telephone 3 off-hook, this waiting state is detected via the subscriber circuit 7. The central control unit 8 then starts called party state transition monitoring processing (S9).

By starting this called party state transition monitoring process (S9), the process of any one of the above-mentioned operation steps S2-S3-S4-S5-S10 or S2-S3-S6-S7-S8-StO is the same as described above. is executed.

[Effects of the Invention] As explained above, the present invention provides a service in which the calling party who is listening to the busy tone can call the called party by simply waiting without performing any special operation. It has the above effect.

[Brief explanation of the drawing]

1, 2, and 6 are simplified diagrams showing a relay system according to an embodiment of the present invention, FIG. 4 is a block diagram of the present invention, and FIG. 5 and FIG. The flowcharts (program memory contents) of the calling process and the calling party state transition monitoring process 9 are shown. 1.2.3... Extension telephone 4... Main switch 5.6.7.
...(Extension) Subscriber circuit 8 ...... Central control unit 9 ...
......Storage element (program memory, writable and readable memory) 10 ...... (Transmission register and various signal sound transmission circuits) Transmission register etc. circuit 11 ... ......This is a calling signal generation circuit. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] In an automatic telephone exchange, when the called party is busy. Means is provided for monitoring state transitions of both the calling party's extension that is listening to the busy tone and the called party's extension that is busy, and the calling party is listening to the busy tone. When the called party is on standby, the caller's telephone is called to the called party's telephone via the called party's extension only when the called party has hung up and the extension is empty. A system for calling a busy called party after a call ends in an automatic telephone exchange, which is characterized by transmitting a signal.