JPH0595420A - Electronic exchange - Google Patents

Abstract

PURPOSE:To prevent disturbance and confusion caused by being connected suddenly to a calling side by considering incoming side off-hook in a delay time corresponding to calling to be a calling operation, and executing preferentially a calling processing. CONSTITUTION:When an electronic exchange 1 detects the calling of a telephone set 2a of a containing extension, a dial tone is sent out thereto. Thus, a calling party dials the telephone number of a called party side. At this time point, a central control unit 6 sets a ring-back tone sending-out delay time T to a telephone set 2a, based on the set value of a calling party level set in advance to a storage device 7. In such a state, in the case the off-hook of the telephone set of the called party side is detected before the delay time T becomes time- out, the controller 6 considers it to be the calling of the called party side, a dial tone is sent from a signal device 5, and subsequently, a busy tone is sent out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic exchange that prevents a user from being hindered when a call-in operation and a call-out operation collide with each other.

[0002]

2. Description of the Related Art In recent years, exchanges have come to use microprocessors as the center of control, and have become increasingly sophisticated and highly functional. And
A digital electronic exchange for private branch exchange using a microcomputer realizes various service functions in addition to the basic function of accommodating internal lines and external lines and performing exchange connection between internal lines and between internal lines and external lines. is doing.

By the way, in the private branch exchange, when the incoming call operation starts, ringing is first sent to the called telephone to ring the bell, and the receiver of the telephone ringing the bell takes off hook. When operated, it is regarded as a response and the calling side and the called side are put in a call state.

As described above, in the conventional system, the off-hook operation of the called-destination terminal during the incoming-call operation is treated as the "response" of the terminal, and the call state is always entered.

FIG. 6 is a sequence diagram showing an outline of the connection operation in the private branch exchange. The operation shown in the figure is as follows. That is, when the caller off-hooks the telephone A (S1), the exchange accepts the call from the telephone A (S2). Then, the exchange sends a dial tone to the caller (calling telephone set A) in order to notify that the call from the telephone set A has been accepted (S3).

After the caller hears this dial tone,
Operate phone A to call the other party's phone number (callee phone B
Dialing the telephone number), the dial signal corresponding to the destination telephone number is sent from the telephone A to the exchange (S4).

The exchange receives this dial signal, analyzes the dial number from this to recognize the called party, and then sends a ring back tone to the calling party (calling telephone set A) (S
6) The ringing is sent to the called party (telephone B of the called party) (S5).

Thereafter, the exchange enters a response detection waiting state in order to detect the response of the called party (callee telephone set B). The destination telephone set B rings by ringing from the exchange, and the called party recognizes the call by listening to it. Then, in order to respond, the telephone B is taken off-hook (S7). The exchange considers the off-hook of the telephone set B as a response to the incoming call (S8) and forms a call path, and a call state is established between the two (S9).

Further, even if the called party goes off-hook for the purpose of making a call before recognizing the ringing of the telephone set B by the ringing (S6) from the exchange (S7), the same exchange as described above is performed. Considers the off-hook of the telephone set B as a response to an incoming call (S8) and forms a communication path, and a communication state is established between the two (S9).

As described above, if there is an incoming call process from the exchange and immediately goes off-hook to make a call, the caller becomes in a call state without knowing the incoming call. In this case, since the purpose of off-hook was to perform a calling operation, the off-hook person is agitated or confused by sudden connection with the calling side. In this way, when an unexpected and unexpected call state is encountered, the person who goes off-hook must talk to the other party in a confused state without being able to grasp the situation, resulting in a very unnatural call between the parties. Will be done. This may cause you to lose respect for the other party (calling party) who called you.
You could end up hanging up the phone in a hurry and failing.

In order to avoid such a situation, the telephone is provided with a call-dedicated key, and if the call-dedicated key is pressed on the exchange, the incoming call to the telephone is cut off.
A configuration in which a dial tone is sent and control is performed so as to wait for dialing can be considered, but doing so not only causes an increase in system cost, but also
A caller who hears a ringback tone suddenly switches to a busy tone or the end of the call, which is an unnatural development, which is also a serious problem from the viewpoint of user service. In addition, the end of the call is detected by detecting on-hook (S13) in the call state.
Done.

[0012]

As described above, in the conventional private branch exchange, since the off-hook in the incoming call state is always regarded as the answer, the called party does not notice the call, and, for example, ringing is almost impossible. At the same time, even when an off-hook is performed for the purpose of making a call, the exchange has a problem that this is treated as a response operation.

Therefore, the object of the present invention is to
An object of the present invention is to provide an electronic exchange capable of making a call operation within a certain time range even when receiving a call, and preventing agitation and confusion caused by sudden connection with the calling side.

[0014]

In order to achieve the above object, the present invention is configured as follows. That is, in the electronic exchange that accommodates the telephone line, the function of recognizing the type of the calling side and obtaining the time corresponding to the type as the grace period, and after the call to the called side is started and before the grace period has elapsed When there is an off-hook on the called side, the off-hook on the called side is regarded as a calling, and a function for executing a calling procedure for the called side, and when the called side is regarded as a calling, The calling side is provided with a control means having a function of performing a busy process on the called side.

[0015]

In the above structure, the control means recognizes the type of the calling side when there is a call, obtains a time corresponding to the type as a grace period, and after the start of the call to the called side, the grace period is set. If there is an off-hook on the called side before the lapse of time, the off-hook on the called side is regarded as a calling operation, the calling procedure is executed for the called side, and the called side is called. Performs processing during side talk. Further, after the grace period has elapsed after the call to the called side is started, if there is an off-hook of the called side, the off-hook of the called side is regarded as a response operation, and the calling side and the called side can talk. ..

As described above, according to the present invention, the grace time corresponding to the call origination is obtained at the time of the call origination, and the off-hook of the called side within the grace time is regarded as the call origination operation, and the call origination processing is prioritized. Within the grace period, for example, the ringback tone is not sent to the calling party, and the off-hook of the called side during that time is regarded as the calling operation instead of the response to the incoming call and is sent to the called side. Sends a dial tone and a busy tone to the calling side. Therefore, it is possible to prevent erroneous response due to off-hook for the purpose of making a call immediately after an incoming call.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In the present invention, the transmission delay time T of the ring back tone to the calling party is determined based on the calling party information (information such as whether the calling side is an external line or an internal line, or a call by transfer) at the time of an incoming call. Then, the incoming call is made to the called party, but the ringback tone is not sent to the calling side until the sending back delay time T of the ringback tone elapses. If the off-hook on the called party side is detected, the call is considered as a calling operation and a dial tone is sent to the called party side, and a busy tone is sent to the calling party side at this time. To do so. When the transmission delay time T elapses, the ringback tone is transmitted to the calling party side, that is, the ringback tone is transmitted to the calling party side after a time (transmission delay time T) at which the called party can recognize the call. Then, when an off-hook on the called party side is detected thereafter, this is regarded as a response operation and a call path is formed to put both parties into a call state.

The above-mentioned control is performed so that it is possible to avoid erroneous response due to off-hook for the purpose of making a call immediately after an incoming call. The details will be described below. Will be explained.

FIG. 1 is a system block diagram showing an embodiment of the present invention. In FIG. 1, 1 is an electronic exchange, 2a
2n are telephones which are terminal devices accommodated in the electronic exchange 1. The telephones 2a to 2n are each given a unique extension number.

Reference numeral 3 denotes a speech path switch network for forming a speech path between the telephone set on the calling side and the telephone set on the called side, and for disconnecting and restoring. Reference numeral 4 is a communication path control device for driving and controlling the communication path switch network 3, and reference numeral 5 is a signal device for transmitting and receiving a dial tone, a selection signal and the like. Reference numeral 6 denotes a central control device for controlling the communication path control device 4 and the signaling device 5, and is configured by using a processor (CPU). A storage device 7 holds a control program or the like to be executed by the central control device 6. In addition to the extension,
It also accommodates external lines (station lines, leased lines, etc.) and enables line connections between internal lines and between internal lines and external lines.

Further, the central control unit 6 has a clock function and shifts the mode to a preset predetermined delay time with respect to a call from an extension telephone, an incoming call to an extension telephone, a call to an extension telephone, etc. Prepared as a period (grace period), the ringback tone transmission timing is delayed from the ringing transmission within this period, and the off-hook side of the called side is considered as a call during this mode transition period, and the period elapses. It has a function to process it as a response at a later time.

Therefore, when the off-hook of the called side is made to the calling side at the timing within the mode transition period (grace time), the called side is processed as busy, and the called side normally operates. The operation that is completely the same as the case of making a call is possible. Such control is performed by executing a control program stored in the storage device 7
Has been realized. FIG. 2 is a flow chart for explaining the operation of the exchange of the present invention, and the operation of the system shown in FIG. 1 will be explained by using this flow chart.

When the electronic exchange 1 detects a call from a telephone (for example, the telephone 2a) of the accommodation extension (S21), it sends a dial tone to the line of the calling extension (S21).
22). This is because the signal device 5 detects the off-hook from the potential of the line of the telephone 2a via the communication path switch network 3,
By giving this detection signal to the central control unit 6, the central control unit 6 recognizes the calling of the telephone set 2a, whereby the central control unit 6 controls the signaling unit 5 and the speech path control unit 4 to make the signaling unit 5 A dial tone signal is generated from the above and is controlled so as to be transmitted to the line of the telephone 2a via the communication path switch network 3.

As a result, the telephone 2a receives the dial tone, and the caller who is the operator of the telephone 2a hears the dial tone and dials the telephone number of the called party from the telephone 2a. By this dial operation, a dial signal is output from the telephone set 2a, and this is sent to the signal device 5 via the communication path switch network 3. The signal device 5 converts the data corresponding to the dial signal into the central control unit 6 Give to. As a result, the central controller 6 recognizes the dial destination from the telephone 2a. When the dial signal is thus received (S23), the central control unit 6 sends a ringing signal to the called party (S24).

If the received dialed number is an extension telephone number and the corresponding extension is vacant, it is connected to the connection line of the telephone set on the called side via the call path switch network 3.
This is performed by sending a ringing signal generated from the signal device 5.

At this point, the central control unit 6 sets the ring back tone transmission delay time T to the calling side telephone 2a based on the calling level set in the storage unit 7 in advance. . Then, the set delay time T is counted down (or counted up). The mode transition period (grace time) is provided over the period of the delay time T. Then, when the delay time T elapses (S25), the central control unit 6 sends the ringback tone to the calling party (S26).

That is, the central control unit 6 controls the signaling unit 5 to generate a ringback tone unless the telephone set on the called side is off-hook at the time when the set delay time T elapses. The ring-back tone signal generated by is sent to the telephone set 2a on the calling side.
As a result, a ringback tone flows to the caller side telephone 2a.

When the telephone of the called party goes off-hook and is transmitted to the central control unit 6 through the communication path switch network 3 and the signaling unit 5, the central control unit 6 detects the off-hook (S27). ), The central controller 6 considers this to be the "answer" of the called party's telephone,
By controlling the call path control device 4, the call path switch network 3 forms a call path between the telephone set on the calling side and the telephone set on the called side (S28).

On the other hand, when the off-hook of the telephone of the called party is detected before the delay time T times out, that is, when the off-hook of the telephone of the called party is detected within the mode transition period, The central control unit 6 regards the telephone of the called party as "calling" (S29), and dials the telephone of the called party (post-calling party) who has become the calling party from the signaling device 5. A tone signal is sent to notify the called party's phone that dialing is ready, and the caller (previous caller) 's phone dialed the called party's phone. Controls the signal device 5 to send a busy tone signal so that the telephone receives the busy tone and informs that the other party is busy (S210).
(Processing during busy).

Here, the central control unit 6 receives a dial signal from the telephone set of the later calling party (S2
11) Based on the dial signal, the process shifts to calling to another line (S212).

FIG. 3 is an operation sequence diagram at the time of off-hook detection of the called party's telephone after the timeout of the delay time T (outside the mode transition period). Explaining according to the drawing, when the exchange detects a call originating from the off-hook (S1) of the calling side telephone A (S2), it sends a dial tone (S).
3). Then, after receiving the dial signal from the calling side telephone A (S4), the ringing is transmitted to the called side telephone B (S5).

At this time, the exchange sets the ringback tone transmission delay time T to the calling party telephone A according to the levels of the called party telephone B and the calling party telephone A. The ring back tone transmission delay time T set in the exchange
After the time elapses, a ring back tone signal is sent to the telephone set A on the calling side (S6). Then, the called party's telephone A
When the off-hook is detected (S7), the exchange considers this as a response (S8), forms a call path between the telephone set A on the calling side and the telephone set B on the called side, and sets the call state (S9). .. FIG. 4 is an operation sequence diagram at the time of detecting the off-hook of the called party's telephone before the timeout of the ringback tone transmission delay time T (within the mode transition period).

Explaining according to the figure, when the exchange detects a call originating from the off-hook (S1) of the calling side telephone A (S2), it sends a dial tone (S3). After receiving the dial signal from the calling telephone A (S
4) Send ringing to the telephone set B on the called side (S
5).

At this time, the exchange sets a ring back tone transmission delay time T to the calling party telephone A according to the levels of the called party telephone B and the calling party telephone A, and starts time counting. ..

When the exchange detects a call originating from the off-hook (S7 ') of the called party telephone B before the ringback tone transmission delay time T times out (S10), the called party telephone B is called "calling". Consider, the called party's telephone B
A dial tone signal is sent to (the later calling side) (S11).

Then, the exchange has the telephone set A on the side of the former calling side.
A busy tone signal is sent to (the calling party side) to notify that the user is busy (S12) (busy process). As a result, the former caller-side telephone A, which is the previous caller who knew that the caller was in the busy state, disconnects by on-hooking (S13) (S16). When a dial signal is transmitted from the telephone set B on the caller side (S14), the exchange moves to a normal calling procedure based on this dial signal (as shown in FIGS. 3 and 4). FIG. 5 shows an example of determination of the ringback tone transmission delay time T at the time of calling. In this example, the delay time T is divided into three levels (L1 <L2 <L3).

"Level 1; L1" is a case where the caller side is an outside line. In this case, the delay time T is set to zero (T1 = 0), and the ringing and ringback tone signals are transmitted at the same time.

"Level 2; L2" is a case of an incoming call due to extension transfer. In this case, the delay time T is set to (T2 = ringing one cycle), and after ringing ringing for one cycle, the caller is called. Allow ringback tones to be sent.

"Level 3; L3" is a case where the caller is an extension. In this case, the delay time T is set to (T3 = about two cycles of ringing), and after the ringing rings for about two cycles, the caller is called. Allow ringback tones to be sent.

In such a level setting, the central control unit can identify the type (line type) of the external line or the extension line for each line accommodated in the exchange, and in the case of incoming call transfer, the incoming call transfer from the receiving telephone set is also performed. It can be identified by the central control unit by an operation, and therefore, the setting level for such type (caller type) and the delay times T1, T2, T3 ... The data may be stored as described above, and the delay time may be set by referring to it during the calling procedure or the incoming procedure, and the control may be performed as described above.

Normally, the ringing ringing time of about one cycle is required for the called party to recognize the call of the telephone, and prioritizing the calling does not cause any inconvenience to the user within this time.

The delay time level settings can be set / cancelled by the respective telephone users by using function keys or the like. Further, the central control device 6 has a function of controlling the signal device 5 to generate a second ringback tone of a tone color different from the original ringback tone during the delay time T and send the second ringback tone to the caller side. It is also possible to inform the calling party that the ring back tone is the delayed ring back tone by sending the second ring back tone to the calling party for listening during the delay time T.

As described above, the present system recognizes the type of the calling side in the electronic exchange accommodating the extension line and the outside line, and the time corresponding to the type is used as the grace period after receiving the dial signal of the calling side and then arriving. First waiting for caller off-hook
Function, and if there is off-hook on the called side before the grace period elapses, the called side is regarded as a calling operation and the calling side enters busy processing and is regarded as the calling side. A second function for executing a calling procedure to the called party, and when the grace period elapses, a ringback tone is sent to the calling party when the busy processing is not performed. And a third function of controlling the called party and the calling party to a call state by considering the called party as a response operation when there is off-hook of the called party after the grace period has elapsed. The control means having the four functions is provided.

In such a configuration, the control means recognizes the type of the calling side (caller type information) such as the line type of the calling side and the calling type such as a transfer call when there is a calling. At the same time, get the time according to the type as a grace period,
After the call to the called party is started, if the called party's off-hook occurs before the grace period has elapsed, the called party's off-hook is regarded as a calling operation, and the calling procedure is performed for the called party. Then, for the calling side, the process of busy of the called side is performed. Further, after the start of the call to the called side, if there is an off-hook of the called side after the grace period has elapsed, the off-hook of the called side is regarded as a response operation, and it is said that the calling side and the called side can talk. It is a thing.

As described above, according to the present invention, the grace time corresponding to the call origination is obtained at the time of the call origination, and the off-hook on the called side within the grace time is regarded as the call origination operation, and the call origination processing is prioritized. Within the grace period, for example, the ring back tone is not sent to the calling party, and the off-hook of the called side during that time is regarded as a calling operation, not as a response to the incoming call, and is sent to the called side. Sends a dial tone and a busy tone to the calling side. Therefore, it is possible to prevent erroneous response due to off-hook for the purpose of making a call immediately after an incoming call.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, and can be carried out by appropriately modifying without departing from the scope of the invention. Although the explanation has been centered on a call from an external line to an internal line, the present invention can be applied to an incoming line from an external line to an internal line, and can be applied not only to a private branch exchange but also to a local exchange.

[0048]

As described above, according to the present invention, when ringing, which is a call at the time of an incoming call, is received,
Off-hook performed during a short time T, which is difficult for the called party to recognize, does not result in an unintentional answer, so that in the case of a rush, there is no possibility of accidentally answering another call. There is. Further, since the delay time T is variable depending on the type of caller, there is an advantage that the user of the other exchange system is not disturbed such as disconnection immediately after the ringback tone.

[Brief description of drawings]

FIG. 1 is a system block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart illustrating an exchange operation of the system shown in FIG.

FIG. 3 is a sequence diagram illustrating an operation of the system of FIG.

FIG. 4 is a sequence diagram illustrating an operation of the system of FIG.

5 is a diagram showing a delay time setting example of the system of FIG.

FIG. 6 is a sequence diagram illustrating the operation of the conventional system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electronic exchange, 2a-2n ... Telephone, 3 ... Call path switch network, 4 ... Call path control device, 5 ... Signal device, 6 ... Central control device, 7 ... Storage device.

Claims (4)

[Claims] 1. A function of recognizing a type of a calling side in an electronic exchange accommodating a telephone line and obtaining a grace period according to the type, and the grace period after starting a call to a called side. If there is an off-hook on the called side before the lapse of time, the off-hook on the called side is regarded as the calling operation, and the function for executing the calling procedure for the called side, and the called side as the calling operation. An electronic exchange comprising control means having a function of performing processing of the called side when the calling side is considered. 2. An electronic exchange accommodating an extension line and an outside line, recognizing a type of a calling side, and receiving a dial signal of the calling side with a time period corresponding to the type as a grace period, and then turning off hook of the called side. The first function of waiting, and if there is an off-hook of the called party before the grace period has elapsed, the called party is regarded as a calling operation, and busy processing is performed on the calling party.
A second function that executes a calling procedure for a called party that is considered to be the calling side, and a ring to the calling side when the grace period has elapsed and the busy process has not been performed. A third function of controlling to send a back tone, and when there is off-hook of the called side after the grace period has elapsed, the called side is regarded as a response operation and the called side and the calling side are called. An electronic exchange characterized by comprising control means having a fourth function of controlling the state. 3. The electronic exchange according to claim 1 or 2, wherein the control means is provided with a function of keeping the calling side in a non-responsive state during the grace period. A private branch exchange comprising: means for controlling switching between ring back tone and busy tone according to off-hook detection timing. 4. The control means is provided with a function of controlling to send a second ringback tone having a tone color different from that of the ringback tone to the calling side during the grace period. 2. The electronic exchange described in 2.