JPH0355072B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a busy call receiving system for a telephone exchange device such as an electronic button telephone device.

(Prior Art and Problems) In a telephone exchange device, when a busy extension is called, a busy call is displayed on the telephone of the extension, and the busy call is answered by a hooking operation on the telephone. There is also a known call-in-waiting call system in which the original call is put on hold and the original call is returned to when the user performs a picking operation again.

By the way, in conventional busy calls, the call-busy indication is based on a method of sending a special tone to the receiver of the telephone that is in use, so if there is an incoming call during a conversation, the incoming call indication may be overlooked. There is fear;
Furthermore, since the operation of answering a busy call and returning to the original call depends on the hooking operation, there is a risk that the call will be disconnected depending on the length of the hooking time.
Furthermore, there is an inconvenience that it becomes unclear whether the other party who is currently talking is the original party or the party receiving the busy call.

(Purpose of the Invention) The present invention is proposed to solve the above-mentioned conventional problems, and the first purpose is to display a busy call display and to ensure that the other party of the busy call can be recognized while the call is busy. The purpose is to obtain a busy call system that does not cause the call to be disconnected when responding to an incoming call, etc., and the second purpose is to provide a busy call system that allows the busy call function to be used as a three-way call function. The purpose is to obtain a communication system.

(Summary of the Invention) For the above purpose, the present invention provides a telephone with a busy call display means and a busy call call button, allows the busy call display means to receive a busy call, and also provides a busy call display means and a busy call call button. While the button is pressed, the original call is put on hold and the call is made to the person receiving the busy call.
When you release the button, you can switch between the original caller and the busy caller, and you can also switch back and forth between the original caller and the busy caller after the original call ends. For convenience, incoming calls are set to camp-on.

(Embodiments of the invention) FIG. 1 is a block diagram of an embodiment of the present invention, and FIGS. 2 and 3 are flowcharts explaining control in the first and second embodiments of the present invention, respectively. .

As shown in FIG. 1, the telephone exchange equipment includes line circuits LC ₁ to LC _o provided corresponding to each extension telephone TEL ₁ to _{TEL o} , and external line trunks COT provided for each external line CO ₁ to _{CO n} . ₁ ~ COT _n , extension telephone
Extension connection switch SW ₁ for connecting TEL ₁ to TEL _o , extension telephone TEL ₁ to TEL _o and outside line
External line connection switch for connecting CO ₁ to CO _n
It consists of SW ₂ and a central processing unit CCU that performs overall control.

Further, the extension telephones TEL ₁ to TEL _o are so-called button telephones, and have, in addition to the telephone communication network N, a speaker S for audible display, a busy call display lamp L, and a busy call button K. The incoming call button K is a non-lock type switch (operates as long as it is pressed, and returns to normal when the button is no longer pressed).

The extension telephones TEL ₁ to TEL _o are respectively connected to the line circuits LC ₁ to LC _o of the telephone exchange equipment by the calling lines la ₁ to la _o and the control lines lb ₁ to lb _o , and each of the calling lines la ₁ to la _o Extension connection switch via line circuit LC ₁ to _{LC o}
It is coupled to SW ₁ and external line connection switch SW ₂ .

Also, the outside line CO ₁ ~ _{CO n} is the outside line trunk COT ₁ ~
It is coupled to outside line connection switch SW ₂ via COT _n .

Central processing unit CCU and each line circuit LC ₁ ~ _{LC o} ,
Internal line connection switch SW ₁ and external line connection switch
SW ₂ and the outside line trunks COT ₁ to _{COT n} are connected through signal paths l ₁₁ to _{l 1o} , l ₂₁ , l ₂₂ and l ₃₁ to _{l 3o} , respectively.

Extension phone TEL ₁ connects to the phone via outside line CO ₁
The operation will be described below with reference to FIGS. 2 and 3, assuming that the extension telephone TEL ₂ calls the extension telephone TEL ₁ during a conversation with TEL _c .

When the extension telephone TEL ₁ and the telephone TEL _c are talking, the cross point Xa of the outside line connection switch SW ₂ is closed, and the following communication route is formed.

TEL _c −CO ₁ −COT ₁ −SW ₂ (Xa)−(SW ₁ )−LC ₁ −la ₁ −T
EL ₁ (N)...(Call route 1) In this state, the central processing unit of the telephone exchange
The extension telephone in use under the control of the CCU
It is monitored whether or not TEL ₁ receives calls from other extension telephones TEL ₂ to TEL _o .

Now, when the extension number is dialed on the extension telephone TEL ₂ to call the above extension telephone TEL ₁ , a dial signal corresponding to the above extension number is sent from the extension telephone TEL ₂ via its control line lb ₂ . Sent to line circuit LC ₂ , central processing unit
The CCU reads the dial signal from the line circuit LC ₂ via the signal path l ₁₂ .

The central processing unit CCU indicates that the extension telephone TEL ₁ corresponding to the above-mentioned dial signal is busy, for example, using an extension table (memory that stores the status of the extension telephones TEL ₁ to TEL _o , which is included in the central processing unit CCU). ) is identified by referring to the item of extension telephone TEL ₁ , and sends the busy call information to signal path l ₁₁ . This busy call information is received by the line circuit LC ₁ and sent to the extension telephone TEL ₁ via the control line lb ₁ . The extension telephone TEL ₁ processes the above-mentioned busy call information, emits a busy ring tone from the speaker S, controls the busy call display lamp L to blink, and allows the user of the extension telephone TEL ₁ (telephone TEL _c and person inside)
Notifies you that a busy call has occurred. This busy call display continues until the busy call button K is pressed on the extension telephone TEL ₁ .

When the user knows about the busy call and presses the busy call button K on the extension telephone TEL ₁ to answer the call, the line circuit LC ₁ is sent from the extension telephone TEL ₁ via the control line lb. Pressing information of the busy incoming call button K (hereinafter referred to as button pressing information) is sent to the central processing unit CCU via the signal path _l11.
reads the button press information from the line circuit LC ₁ via the line circuit LC 1 and erases the busy call information sent to the extension telephone TEL ₁ , stops the busy ringtone from the speaker S of the extension telephone TEL ₁ , At the same time, the busy call display lamp L changes from flashing to lit, and hold information is sent to the outside line trunk COT ₁ via the signal path L ₁₃ , and the telephone in the outside line trunk COT ₁ is
Hold TEL _c (external line CO ₁ ). Then the signal path l ₂₁ ,
l Access the internal line connection switch SW ₁ and the external line connection switch SW ₂ via l ₂₂ , and connect the external line connection switch
Open cross point Xa of SW ₂ and open cross points Xb and Xc of extension connection switch SW ₁ .
Close. This forms the next call path,
Calls can be made between extension telephones TEL ₁ and TEL ₂ .

TEL ₁ (N)-l _a1 -LC ₁ -SW ₁ (Xb-Xc)-LC ₂ -l _a2 -T
EL ₂ (N)...(Call route 2) This call route is maintained as long as the busy call button K is pressed on the extension telephone TEL ₁ .

After finishing the call with extension telephone TEL ₂ ,
When you stop operating the busy call button K at TEL ₁ and the busy call button K is restored (released from being pressed), the central processing unit CCU connects the control line lb ₂ , the line circuit LC ₁ , and the signal path l ₁₁ The signal path is determined by identifying the stop of sending the button press information from the extension telephone TEL ₁ .
The hold release information is sent to the external line trunk COT ₁ via l ₃₁ to release the hold of telephone TEL _c , and is sent again to the internal line connection switch SW ₁ and the external line connection switch SW ₂ via signal paths l ₂₁ and l ₂₂ . Access and open crosspoints Xb and Xc of extension line connection switch _SW1 , and crosspoint Xa of external line connection switch _SW2.
Close again. As a result, the above (call route 2)
disappears, the above-mentioned (call route 1) is re-established, and a call can be made again between the extension telephone TEL ₁ and the telephone TEL _c .

The control described above is common to the first embodiment and the second embodiment.

After the call has been resumed between the extension telephone TEL ₁ and the telephone TEL _c , in the first embodiment the central processing unit CCU sends a message to the line circuit LC ₁ via the signal path l ₁₁ to terminate the busy incoming call. This call termination information is sent to the extension telephone TEL ₁ via the control line lb ₁ , causing the busy call display lamp L of the extension telephone TEL ₁ to disappear, and changing the extension telephone TEL ₂ to the extension telephone. Set the camp-on state to TEL ₁ (camp-on control itself is possible by a known method),
Monitor end calls on extension telephone TEL ₁ .

In addition, in the second embodiment, the central processing unit CUU
sends the hold information to the line circuit LC ₂ via the signal path l ₁₂ , and in this line circuit LC ₂ the extension telephone is
TEL ₂ (call line l _a2 ) is put on hold and the extension phone TEL ₂ is camped on to the extension phone TEL ₁ , and then the extension phone TEL ₁ is transferred via the signal path l ₁₁ , the line circuit LC ₁ and the control line lb _1. The lighting information of the busy call display lamp L being sent to is changed to blinking information, and the busy call display lamp L of the extension telephone TEL ₁ is set in a blinking state.

Here, in the first and second embodiments, when the user of the extension telephone TEL ₁ finishes the call with the telephone TEL _c and performs a call termination operation (an operation of putting down the handset) on the extension telephone TEL ₁ . , Call-back control of the extension telephone TEL ₁ is performed by known camp-on control, and a call can be made to the extension telephone TEL ₂ which is on standby in the camp-on state.

In the second embodiment, the user of extension telephone TEL ₁ presses the busy incoming call button on extension telephone TEL 1 in order to talk to extension telephone TEL ₂ again without ending the call after starting a conversation with telephone TEL _{c again} . When K is pressed, the busy call indicator L changes from flashing to lit in the same way as above, the telephone TEL _c is put on hold in the outside line trunk COT ₁ , and the outside line connection switch is switched on.
Open cross point Xa of SW ₂ . At this time,
Since the extension telephone TEL ₂ is on hold, the central processing unit CCU sends hold release information to the line circuit LC ₂ via the signal path l ₁₂ to release the hold of the extension telephone TEL ₂ , and switches the extension connection switch SW. The above-mentioned (call route 2) is formed by closing the cross points Xb and Xc of ₁ , and a call can be made between the extension telephones TEL ₁ and TEL ₂ again.

From then on, the extension phone where the call-waiting call occurred will be
The above control is repeated each time the busy call button K is pressed and released on TEL ₁ , and the corresponding extension telephone is
The user of TEL ₁ can alternately talk between telephone TEL _c (original caller) and extension telephone TEL ₂ (busy caller).

In the above explanation, we took as an example the case where the original call was to an external telephone, but you can also perform a busy call using the same operation even if the original call was to an internal telephone. can.

(Effects of the Invention) As explained above, the present invention displays a busy call by using the busy call display means (lamp/speaker) of the telephone, and continues to press a push button to indicate a busy call. Unlike the conventional method that sends a special tone to the handset, it is possible to reliably recognize a busy call. There is no risk of disconnecting the call due to the pushbutton being pressed, and since the call is with the called party while the push button is being pressed, the person on the other end of the call can be reliably identified.

Furthermore, the call is not limited to one time, but can be made many times by repeatedly pressing and releasing the call button, thereby making it possible to make a three-way call.

As described above, the present invention has various advantages, and its effects are extremely large.

[Brief explanation of drawings]

The drawings are for explaining embodiments of the present invention; FIG. 1 is a block diagram, and FIGS. 2 and 3 are flowcharts of the first and second embodiments, respectively. (Main symbols), TEL ₁ ~ TEL _o ...Extension telephone,
TEL _c ... Telephone (external line side), SW ₁ ... External line connection switch, SW ₂ ... External line connection switch, S... Speaker, L... Busy call indicator, K... Busy call button.

Claims (1)

[Scope of Claims] 1. A telephone is provided with a busy call display means and a busy call button, and when a second telephone that is currently on the phone with a first telephone receives a call from a third telephone, Displaying an incoming call on the busy call display means of the second telephone, and pressing the busy call button on the second telephone puts the call on hold with the first telephone, and the third telephone A call to the third telephone is started and the call is continued while the busy call button is pressed, and when the busy call button is released, the call to the third telephone is terminated. A busy call receiving system in which the call with the first telephone is released from hold and the call with the first telephone is resumed. 2. Claim 1 in which an incoming call from a third telephone is camped on to the second telephone.
Busy call method described in section. 3. A telephone is equipped with a busy call display means and a busy call button, and when a second telephone that is currently talking with a first telephone receives a call from a third telephone, the second telephone is busy. By displaying an incoming call on the incoming call display means and pressing the busy incoming call button on the second telephone, the call with the first telephone is put on hold and the call with the third telephone is started. The call is continued while the busy call button is pressed, and when the busy call button is released, the call with the third telephone is put on hold, and the call with the first telephone is continued. is released from hold and the call with the first telephone is resumed.Thereafter, by repeatedly pressing and releasing the busy call button on the second telephone, the call between the third telephone and the first telephone is resumed. A busy call system that allows calls to be made alternately with the telephone. 4 Claim 3 in which an incoming call from a third telephone is camped on to the second telephone
Busy call method described in section.