JP3589816B2 - Private branch exchange - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a private branch exchange accommodating a digital network and a telephone terminal connected to a destination telephone terminal via a communication channel of the digital network.
[0002]
[Prior art]
Conventionally, such a private branch exchange accommodates a digital network and a telephone terminal connected to a destination telephone terminal via a communication channel of the digital network.
[0003]
The operation in the case where a telephone terminal accommodated in such a private branch exchange continuously transmits a call to a destination telephone terminal of a digital circuit network will be described.
[0004]
FIG. 4 is a sequence diagram showing a processing operation related to a continuous calling operation of a telephone terminal between a conventional private branch exchange and a digital circuit network.
[0005]
During a call the telephone terminal and the partner telephone terminal in between the private branch telephone exchange and digital line network 4 (step S31), the lower Rosuka the handset of the telephone terminal, or, when on-hook key operation is performed (Step S32), the private branch exchange notifies the digital network of a disconnection message (DISC) for urging the end of the telephone call between the telephone terminal and the other party's telephone terminal, that is, for urging the other party's telephone terminal to release the communication channel (step S32). Step S33).
[0006]
The digital network receives the disconnect message, and releases preparation of the speech channel during a call, notification release message indicating that the communication channel in the destination telephone terminal enters the release prepare (REL) to the private branch telephone exchange (Step S34).
[0007]
The private branch telephone exchange receives the release message, complete release of the communication channel in the destination telephone terminal, RELEASE COMPLETE message indicating that it is now possible to reuse of traffic channel (REL C MP) digital network (Step S35). At this time, the communication channel is in an empty state.
[0008]
Next, when the off-hook operation of raising the handset from the telephone terminal (step S36) and the dial number of the other telephone terminal are dialed from the telephone terminal (step S37), the private telephone exchange switches the currently available communication channel. The call is captured, and a call setup message (SETUP) requesting call setup is notified to the digital network via the captured call channel (step S38).
[0009]
When the digital network receives the call setup message, the call setup is started and a call setup acceptance message (CALL) indicating that no further call setup information is required.
PROC) is notified to the private branch exchange (step S39).
[0010]
Further, the digital network notifies the private branch exchange of a calling message (ALERT) indicating that the calling operation of the called user (the other party's telephone terminal) has started (step S40). Further, the digital network notifies the private branch exchange of a response message (CONN) indicating that the called user (the destination telephone terminal) has responded and communication has become possible (step S41).
[0011]
Upon receiving the response message, the private branch exchange notifies the digital network of a response confirmation message (CONN ACK) indicating a confirmation response of the response message (step S42). As a result, the telephone terminal and the other party's telephone terminal enter a talking state (step S43).
[0012]
That is, as a continuous call operation by the telephone terminal, for example, the telephone terminal of the other party is connected to the telephone terminal via a communication channel, and after the telephone call between the other terminal and the telephone terminal, the receiver of the telephone terminal is temporarily turned on. down to be off the hook. Then, the user of the telephone terminal raises the receiver of the telephone terminal again, goes on-hook, dials the destination telephone number, and makes a call to the destination telephone terminal or another destination telephone terminal. .
[0013]
[Problems to be solved by the invention]
However, in the above-mentioned conventional private branch exchange, in the case of performing a continuous calling operation by a telephone terminal, after a telephone call, the receiver on the telephone terminal side is dropped, thereby disconnecting even the connected communication channel to an empty channel. Therefore, for example, if the number of call channels is small, the connected call channel is disconnected, and then the call channel becomes empty, and if a call is received from another destination telephone terminal to the telephone terminal, the call is terminated. After receiving the call and ending the call, there is a problem that it is necessary to perform a call operation from the telephone terminal again after capturing an empty communication channel.
[0014]
Also, in a conventional private branch exchange, in the case of continuous transmission on an analog line, a one-touch hooking (one-touch key press) operation is performed instead of a handset lowering operation, so that a disconnection signal is transmitted, and then transmission is performed. A continuous transmission operation can be realized only by transmitting a signal, and such a continuous transmission operation on an analog line is known.
[0015]
However, in the above-mentioned conventional private branch exchange, since a disconnection control sequence and a transmission control sequence are required in a continuous transmission operation on a digital line, the sequence control requires that the receiver of the telephone terminal be lowered after a telephone call (on-hook). Again, the receiver must be picked up and the destination dialed number must be operated, resulting in a very troublesome operation.
[0016]
The present invention has been made in view of the above problems, and an object of the present invention is to improve the operability required for a continuous transmission function in a digital network and to make a call during a continuous transmission function by a telephone terminal. It is to provide a private branch exchange which can secure a channel.
[0017]
[Means for Solving the Problems]
Private branch exchange according to claim 1, wherein in the present invention in order to achieve the above object, private telephone for accommodating a digital network, the telephone terminal to be connected to the called telephone terminal via the speech channel of the digital network An exchange, wherein the private branch exchange connects one communication channel and a telephone terminal, and performs a hook-up operation from the telephone terminal during a telephone call between the other party's telephone terminal and the telephone terminal. When a disconnection message (DISC) is transmitted to the network and a release message (REL) is received from the digital network, a release complete message (REL COM) is transmitted to the digital network, and the telephone terminal remains on-hook. Maintaining the connection between the telephone terminal and the call channel and connecting to the digital network in accordance with a dial operation from the telephone terminal. It is characterized by transmitting a call setup message (SET UP) .
[0019]
Therefore, according to the private branch exchange according to claims 1 and 2 of the present invention, during a call between the other party's telephone terminal and the telephone terminal, the other party's telephone terminal and the telephone terminal respond to a predetermined one-touch operation from the telephone terminal. The call with the other party's phone terminal is disconnected from the other party's phone terminal because the connection between the phone terminal and the call channel is maintained until the phone terminal goes on-hook even after the call is disconnected. Even after the call is disconnected, the connected communication channel can be secured until the telephone terminal goes on-hook, and a continuous transmission function in a digital circuit network can be realized by a simple operation.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a private branch exchange according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a private branch exchange and a digital circuit network showing an embodiment of the present invention. FIG. 2 is a plan view of a telephone terminal accommodated in a private branch exchange.
[0021]
In FIG. 1, a private branch exchange (PBX) 1 includes a digital network 2 and destination telephone terminals (TEL B, TEL C, TEL D) 3B, 3C, 3D via a communication channel 2a of the digital network 2. A line circuit (LIN) 5 for accommodating a telephone terminal (TEL A) 4 to be connected and controlling the connection with the telephone terminal 4, and an office line and a dedicated line trunk (COT / PRI) for controlling the connection with the digital line network 2 6, a memory (MM) 7 for storing a control program of the private branch exchange 1 and office data, etc., and a central processing unit 8 for controlling the whole private telephone exchange 1 based on the control programs and the like stored in the memory 7. And
[0022]
As shown in FIG. 2, the telephone terminal 4 has a hooking key (Hooking) 4a for prompting a continuous call operation by a one-touch operation and a dial key 4b for inputting a dial number on the board of the telephone terminal 4.
[0023]
Next, the continuous calling operation of telephone terminal 4 in private branch exchange 1 according to the present embodiment will be described.
[0024]
The telephone terminal 4 shown in FIG. 1 terminates a call during a call with the destination telephone terminal 3B in the digital network 2 via the private branch exchange 1, and performs, for example, a call with the destination telephone terminal 3D. One-touch operation of the hooking key 4a of the telephone terminal 4 is performed.
[0025]
The user of the telephone terminal 4 performs a one-touch operation on the hooking key 4a to disconnect the call with the destination telephone terminal 3B, and dials the destination dial number of the destination telephone terminal 3D to thereby obtain the destination telephone terminal. Call 3D. It should be noted that even if the communication with the other party's telephone terminal 3B is disconnected, the communication channel 2a connected to the telephone terminal 4 in the digital circuit network 2 is maintained without disconnection.
[0026]
When the destination telephone terminal 3D answers the call, the destination telephone terminal 3D and the telephone terminal 4 enter a talking state. In this manner, a continuous calling operation by the telephone terminal 4 can be realized.
[0027]
Now, the continuous transmission operation in the digital network 2 will be described in more detail. FIG. 3 is a sequence diagram showing a processing operation related to a continuous calling operation of the telephone terminal 4 between the private branch exchange 1 and the digital network 2.
[0028]
In FIG. 3, between the private branch exchange 1 and the digital circuit network 2, during a telephone call between the telephone terminal 4 and the destination telephone terminal 3B (step S11), the hooking key 4a, which is an operation key of the telephone terminal 4, is operated by one touch. When this is done (step S12), the private branch exchange 1 prompts the end of the call between the telephone terminal 4 and the destination telephone terminal 3B, that is, a disconnection message (DISC) prompting the release of the communication channel 2a in the destination telephone terminal 3B. Is notified to the digital network 2 (step S13).
[0029]
The digital network 2 receives the disconnect message, and releases preparation of the speech channel 2a busy, premises a release message (REL) indicating that it has entered the release preparation of the speech channel 2a in the destination telephone terminal 3B Notification is made to the telephone exchange 1 (step S14).
[0030]
The private branch exchange 1 receives the release message, releases the speech channel 2a in the destination telephone terminal 3B is complete, release complete message indicating that it is now possible to reuse of traffic channel 2a (REL C MP) To the digital network 2 (step S15).
[0031]
At this time, although the communication channel 2a is released, the connection state between the communication channel 2a and the telephone terminal 4 is secured. Therefore, for example, even if there is an incoming call from the other party's telephone terminal 3C to the telephone terminal 4, the incoming call to the telephone terminal 4 cannot be made because the communication channel 2a is not empty, and the incoming call to the telephone terminal 4 can be prevented. Can be.
[0032]
Next, when the dial number of the other party's telephone terminal 3D is dialed from the telephone terminal 4 (step S16), the private branch exchange 1 requests a call setting via the currently secured communication channel 2a. To the digital network 2 (step S17). When receiving the call setup message, the digital network 2 starts the call setup, and notifies the private branch exchange 1 of a call setup acceptance message (CALL PROC) indicating that no further call setup information is required. (Step S18).
[0033]
Further, the digital network 2 notifies the private branch exchange 1 of a calling message (ALERT) indicating that the calling operation of the called user (the destination telephone terminal 3D) has started (step S19). Further, the digital network 2 notifies the private branch exchange 1 of a response message (CONN) indicating that the called user (the destination telephone terminal 3D) has responded and communication has become possible (step S20).
[0034]
Upon receiving this response message, the private branch exchange 1 notifies the digital network 2 of a response confirmation message (CONN ACK) indicating a confirmation response of the response message (step S21). As a result, the telephone terminal 4 and the other party's telephone terminal 3D enter a communication state (step S22).
[0035]
Therefore, according to the present embodiment, during a call between the other party's telephone terminal 3B and the telephone terminal 4, the other party's telephone terminal 3B and the telephone terminal 4 communicate with each other in response to a one-touch operation using the hooking key 2a of the telephone terminal 4. Is disconnected, and even after the call is disconnected, the connection between the telephone terminal 4 and the communication channel 2a is maintained until the telephone terminal 4 is on-hook. Even after the call is disconnected, the connected call channel 2a can be secured until the telephone terminal 4 is hooked on.
[0036]
In other words, according to the present embodiment, during continuous calling using the hooking key 4a many times during a call, there is no incoming call to the telephone terminal 4 and the call is made using the same call channel 2a. Since the same call channel 2a is used, it is possible to prevent a situation in which once a call is made, there is no available call channel and the call cannot be made again when the next call is made again. it can.
[0037]
Further, this makes it possible to effectively use digital lines and improve business efficiency, for example, for users who have a relatively high transmission weight, such as marketing research.
[0038]
Further, according to the present embodiment, the digital line network 2 can perform continuous calling simply by pressing the hooking key 4a and the dial key 4b of the telephone terminal 4 during a call, similarly to the analog line network. Continuous transmission is possible without being aware of analog / digital lines.
[0039]
【The invention's effect】
According to the private branch exchange of the present invention configured as described above, during a call between the other party's telephone terminal and the telephone terminal, the communication between the other party's telephone terminal and the telephone terminal is performed according to a predetermined one-touch operation from the telephone terminal. The call is disconnected, and even after the call is disconnected, the connection between the telephone terminal and the communication channel is maintained until the telephone terminal goes on-hook. Even after this, the connected communication channel can be secured until the telephone terminal is hooked on, and the continuous transmission function in the digital circuit network can be realized by a simple operation.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration of a private branch exchange and a digital network showing an embodiment of the present invention.
FIG. 2 is a plan view of a telephone terminal accommodated in a private branch exchange according to the present embodiment.
FIG. 3 is a sequence diagram relating to a continuous calling operation between the private branch exchange and the digital circuit network shown in the present embodiment.
FIG. 4 is a sequence diagram relating to a conventional continuous transmission operation between a private branch exchange and a digital circuit network.
[Explanation of symbols]
1 Private branch exchange (PBX)
2 Digital network 2a Communication channel 3 Telephone terminal (TEL B, TEL C, TEL D)
4 Telephone terminal (TEL A)
4a Hooking key (Hooking)
4b dial key

Claims (1)

A private branch exchange accommodating a digital network and a telephone terminal connected to a destination telephone terminal via a communication channel of the digital network,
The private branch exchange connects one call channel to a telephone terminal and, during a call between the other party's telephone terminal and the telephone terminal, disconnects a message to the digital network in response to a hooking operation from the telephone terminal. DISC), and upon receiving a release message (REL) from the digital network, transmits a release complete message (REL COM) to the digital network, until the telephone terminal goes on-hook. A private branch exchange that maintains a connection with a call channel and transmits a call setup message (SET UP) to the digital network in response to a dial operation from the telephone terminal .

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