JP2832866B2 - Private branch exchange - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a private branch exchange which can be connected to a digital communication network capable of providing a call termination service.

2. Description of the Related Art Conventionally, in a communication using an analog network, when a new incoming call request occurs during a call, a notification is made by a ring tone mixed with the call voice. Therefore, even when a private branch exchange that accommodates a plurality of analog lines and connects a plurality of extension terminals receives an incoming call from an extension terminal during communication on the analog line, the incoming call during the call is mixed by the ringing tone mixed with the above-mentioned call voice. Had been notified. In other words, the private branch exchange itself did not need to perform any processing during the incoming call during communication.

On the other hand, when a new incoming call request occurs during a call in communication using a digital communication network, the occurrence of an incoming call can be known by receiving a call incoming call notification from the network via a control channel. Therefore, when a private branch exchange that accommodates a plurality of digital lines and connects a plurality of extension terminals receives an incoming call during a call on a digital line with which the extension terminal is communicating,
The private branch exchange can recognize the occurrence of an incoming call during a call, but the extension terminal cannot recognize the occurrence of an incoming call during a call.

FIG. 6 is a block diagram showing the configuration of a conventional private branch exchange. In the figure, 1 is a main unit of the private branch exchange, 2 is a communication line (analog line), 3 is a line interface unit, 4 is a central control unit (CPU), 5 is a communication line switch, 6 is a subscriber circuit, 7 Is a digital / analog converter (D / A converter), 8 is an analog / digital converter (A
/ D conversion circuit), 9 is a data bus and an address bus, 10a,
10b is a communication path (highway), 11 is a subscriber line, 12a to 12c
Is a single telephone (SLT) (common code is 12).

 Next, the operation of the apparatus shown in FIG. 6 will be described.

When an incoming call is received from the line 2, the line interface unit 3 that has detected the incoming call notifies the CPU 4 of the incoming call. The CPU 4 rings the extension-only telephones 12a to 12c via the preset subscriber circuit 6. When the single telephone 12 goes off-hook, the subscriber circuit 6 detecting the off-hook sends the
The CPU 4 switches the channel switch 5 so that the time slot assigned to the line where the call arrived is connected to the time slot assigned to the off-hook single telephone, and the call is started. That is, the line 2 is connected to the single telephone 12 via the line interface unit 3, the highway 10a, the communication path switch 5, the highway 10b, the subscriber circuit 6, and the subscriber line 11.

When an incoming call request is made during this call, the incoming request notification is mixed with the voice signal and
Reach 12 When the user of the single telephone 12 recognizes the incoming request notification signal and performs a hooking operation, the subscriber circuit 6 that has detected the hooking notifies the CPU 4, and the CPU 4 notifies the line interface unit 3 that the hooking is to be transmitted. . The line interface unit 3 sends a hooking signal to the line 2 and notifies the network that the incoming call has been accepted.

(Problems to be Solved by the Invention) Next, problems in a case where a digital line is accommodated in the configuration of the conventional private branch exchange will be described.

In digital lines, data required by a subscriber, such as voice, is generally separated from data required for switching and connection. When an incoming call request occurs during a telephone call, the incoming call request notification is notified to the line interface unit 3 by a channel (hereinafter, a control channel) for transmitting data necessary for exchange / connection. The line interface unit 3 can notify the CPU 4 of the incoming call during the call via the data bus 9, but cannot notify the single telephone 12 connected to the extension of the incoming call during the call. It was a problem.

As described above, in the above-described conventional example, when an incoming call occurs during a call, the private branch exchange apparatus can recognize the occurrence of the incoming call during a call. There was a drawback that the mid-call service could not be used effectively.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an incoming call from a digital outside line during a call via a digital outside line from a digital communication network to which an extension terminal is connected as an outside line. Another object of the present invention is to provide a private branch exchange which can reliably notify the user of the extension terminal of the fact that there is an incoming call from the digital outside line without much disturbing the call.

(Means for Solving the Problems) In order to achieve the above object, the invention according to claim 1 provides a private branch exchange to which a digital external line from a digital communication network is connected as an external line while a call is being made via the digital external line. Generating means for generating an incoming call notification sound for notifying an extension terminal of an incoming call from a digital outside line during a call, and a call path switch for connecting the extension terminal to the digital outside line during the call or the generating means Means, and the control means for instructing the communication path switch means to execute a first operation mode for connecting the extension terminal to the digital external line while the extension terminal is in a call via the digital external line, The control means connects the extension terminal to the generating means when the extension terminal receives a call from the digital outside line during the call during the call through the digital outside line. Instructing the communication path switch means to execute the second operation mode, and instructing the communication path switch means to execute the first operation mode after a lapse of a predetermined time from the instruction; Alternately instructing the communication path switch means to execute the first and second operation modes so that the sound in progress and the incoming call notification sound from the generation means are alternately transmitted to the extension terminal. It is characterized by.

The invention according to claim 2 is a private branch exchange to which a digital external line from a digital communication network is connected as an external line.
Generating means for generating an incoming call notification sound for notifying an extension terminal on a call via the digital outside line of an incoming call from the digital outside line during the call, and synthesizing means for synthesizing two inputted voices; Communication path switch means, and control means for controlling the switch means so that the extension terminal is connected to the digital external line during a call through the digital external line, the control means, the extension When the terminal receives a call from the digital outside line during the call during the call via the digital outside line, the voice during the call from the digital outside line and the call reception notification sound from the generation unit are transmitted to the synthesis unit. The communication path switching means is controlled so that the input and the output synthesized by the synthesizing means are transmitted to the extension terminal.

(Operation) In the private branch exchange according to the first aspect, the control means connects the extension terminal to the generation means when the extension terminal receives a call from the digital outside line during the call through the digital outside line. And instructs the communication path switch means to execute the second operation mode, and instructs the communication path switch means to execute the first operation mode after a lapse of a predetermined time from the instruction. The first and second operation modes are alternately instructed to the communication path switching means so that the incoming call notification sound from the means is alternately transmitted to the extension terminal.

In the private branch exchange according to claim 2, when the extension terminal receives a call from the digital external line during the call during the telephone call via the digital external line, the control unit outputs the voice during the call from the digital external line and the generation unit. Is controlled by the synthesizing means, and the output of the synthesizing means is transmitted to the extension terminal.

(Embodiment) FIG. 1 is a block diagram showing a first embodiment of a private branch exchange according to the present invention, in which 1 is a main unit of the private branch exchange, 2 is a digital communication line, and 3 is a line. Interface unit, 4 a central control unit (CPU), 5 a communication path switch, 6 a subscriber circuit, 7 a digital / analog conversion circuit, 8 an analog / digital conversion circuit, 9 a data bus and an address bus, 10a to 10a to 10c is a communication path (highway), 11 is a subscriber line, 12a to 12c are single telephones as extension terminals, and 13 is a tone memory.

The operation of each of the above components 1 to 12 during a normal call is the same as that of the above-described conventional example shown in FIG. The tone memory 13 according to the present invention has a function of storing an incoming call notification sound during a call.

FIG. 2 is a flowchart of a processing procedure when an incoming call occurs during a call in this embodiment.

Next, the operation of the private branch exchange as an embodiment of the present invention at the time of an incoming call during a call will be described with reference to FIGS. During a call, the digital line 2 is connected to the single telephone 12 via the line interface unit 3, the highway 10a, the call path switch 5, the highway 10b, the subscriber circuit 6, and the subscriber line 11, as in the prior art. If an incoming call request occurs during this call, the incoming call request notification is sent to the line interface unit 3 via the control channel. The line interface unit 3 notifies the CPU 4 via the data bus 9 of the incoming call during the call. Here, the CPU 4 performs an operation of switching the communication path switch 5. That is, according to the present embodiment, the state where the conventional highways 10a and 10b are connected is changed to the state where the highways 10b and 10c are connected. Trying to reach. A more specific control method is as shown in the flowchart of FIG. That is, after detecting the incoming call and connecting the time slot of the tone memory 13 to the time slot of the SLT (steps S1 and S2), the highways 10b and 10c are connected for approximately 100 milliseconds at approximately 1 second intervals, and the tone memory 13 is connected. To the user of the single telephone 12 (step S2
~ S8). At other times, connect highways 10a and 10b,
Hear call voice to user of single phone 12 (step
S5).

When the user who has recognized the sound from the tone memory 13 performs a hooking operation, the subscriber circuit 6 that has detected the hooking operates as follows.
Notifying the CPU 4 of the hooking detection, the CPU 4 stops the communication path switch switching operation and connects to the highways 10a and 10b.
At the same time, the CPU 4 notifies the line interface unit 3 that the incoming call has been accepted during the call (step S9). The line interface unit 3 notifies the line 2 of the acceptance of the incoming call during the call through the control channel, whereby the process of the incoming call during the call is completed (step S10).

In the first embodiment, one audio channel is provided for one digital line.
The same effect can be obtained even when the number of voice channels per digital line increases. However, when there are a plurality of voice channels per digital line, and when all the channels are busy, the CPU 4 needs to control which channel should be used to make a call incoming request.

Further, in the first embodiment, the call notification sound during call is realized by intermittently calling from the tone memory 13.
It is also possible to configure so that the user of the single telephone 12 can freely set the time interval and the length of the notification sound.

Further, in the first embodiment, the outside line is assumed to be one line of the digital communication line 2, and the inside line is assumed to be the single telephones 12a to 12c. However, it is needless to say that the same effect is obtained regardless of the number of these components. Nor. In addition, although only an analog single telephone is connected to the extension, a system in which other dedicated telephones unique to the system are mixed may be used.

Next, a second embodiment will be described. In the embodiment described above, an incoming call during a call from the digital communication network can be notified to the analog single telephone at the extension, but the call signal from the digital communication network is cut off. In the second embodiment, the cutting is prevented.

FIG. 3 shows a second embodiment of the present invention. In the figure, 21 is the main unit of the key telephone apparatus, 22 is a single telephone, 23
Is a dedicated telephone, 24 is an ISDN line, which is a digital communication network that provides an incoming call service during a call, 25 is a PSTN line, which is a conventional public network, 26 is a call path section that handles call switching, and 27 is an ISDN
Interface, 28 is a PSTN interface, 29 is a single telephone interface, 30 is a dedicated telephone interface,
31 is a tone sending circuit that generates various tones including a call notification tone during a call, 32 is a three-way conference circuit, 33 is a CPU that controls the entire main device 21, 34 is a ROM in which a control program of the CPU 33 is stored, Reference numeral 35 denotes a RAM that provides various data for controlling the CPU 33 and a work area for various calculations.

Next, in the above configuration, using the three-party conference circuit 32,
FIG. 4 and FIG. 5 show the operation when outputting the combined output of the incoming call notification tone during a call and the call signal of the ISDN line to the single telephone set 22.
The description will be made according to the drawings.

FIG. 4 is an explanatory diagram for explaining the connection of the communication path between the ISDN line 24 and the single telephone 22. Reference numerals 40 to 43 denote input highways, and reference numerals 44 to 47 denote output highways. In a digitized key telephone apparatus, as shown in FIG. 4, a call signal is transmitted in a time-division multiplexed form in the form of a digital signal in a predetermined time zone on a highway for inputting / outputting a call path. You. Each of the defined time zones is called a time slot. A bidirectional communication is realized by transmitting a communication signal carried on each time slot on the input highway to each other's time slot on the output highway by the communication path unit 26. In FIG. 4, ISDN
Line 24 and single telephone 22 are input and output highways 40 and 4 respectively.
It is allocated to 4, 41, 45 time slots TS2, TSn. While the ISDN line 24 and the single telephone 22 are in a call, the ISDN line 24
The operation performed when an incoming call is received from another user will be described below with reference to FIG. 4 and according to the flowchart of FIG.

When an incoming call is generated from another on the ISDN line 24 during a call (step S11), the CPU 33 detects this via the ISDN interface 27, controls the communication path unit 26, and outputs the input to the three-way conference circuit 32. To the same time slot (TS1 in FIG. 4) of the highways 46 and 47, the call signal "I" of the ISDN circuit 24 and the call notification tone "T" from the tone transmission circuit 31
Is output. The three-party conference circuit 32 combines the above "1" and "T", outputs a combined output "I + T" with a time delay of two time slots, and outputs it to the time slot TS3 of the input highway 43 ( Step S12). CPU33 is ISD
From time slot TS2 of input highway 40 for N line 24 to time slot TS of output highway 45 for single telephone 22
The path of the communication path connected to n is restored, and the time slot TS3 of the input highway 43 and the output highway 4 assigned to "I + T" synthesized by the three-way conference circuit 32 are output.
Connect a call path to time slot TSn of step 5 (step S1
3).

As described above, if there is an incoming call to the ISDN line 24 during a call between the ISDN line 24 and the single telephone 22, the call incoming notification tone and the call signal of the ISDN line 24 are combined without interrupting the call. By sending the output to the single telephone 22,
The single telephone 22 can be notified of an incoming call during a call.

(Effects of the Invention) As described above, according to the private branch exchange according to the first aspect, the control unit determines that an incoming call from a digital outside line during a call is received by the extension terminal during a call via the digital outside line. ,
Instructing the speech path switch means to execute a second operation mode for connecting the extension terminal to the generation means, instructing the speech path switch means to execute the first operation mode after a lapse of a predetermined time from the instruction; Since the first and second operation modes are alternately instructed to the communication path switch means so that the voice during the call from the outside line and the incoming call notification sound from the generation means are alternately transmitted to the extension terminal. If there is an incoming call from the digital external line during a call via a digital external line from a digital communication network to which the extension terminal is connected as an external line, the incoming call from this digital external line will not be much disturbed. Can be reliably notified to the user of the extension terminal.

According to the private branch exchange according to claim 2, the control means includes:
When the extension terminal receives a call from the digital external line during the call during the call via the digital external line, the voice during the call from the digital external line and the call notification sound from the generating unit are input to the synthesizing unit, The communication path switching means is controlled so that the output synthesized by the synthesizing means is transmitted to the extension terminal. Therefore, during the telephone call via the digital external line from the digital communication network to which the extension terminal is connected as the external line, the digital external line When you receive a call from,
It is possible to reliably notify the user of the extension terminal that there is an incoming call from the digital outside line.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a private branch exchange according to a first embodiment of the present invention, FIG. 2 is a processing flowchart for an incoming call during a call, and FIG. 3 is a private branch exchange according to a second embodiment of the present invention. 4, FIG. 4 is an explanatory diagram of connection in a communication path, FIG. 5 is a flowchart for explaining the operation of the embodiment of FIG. 3, and FIG. 6 is a block diagram of a conventional private branch exchange. It is a system diagram. DESCRIPTION OF SYMBOLS 1 ... Main apparatus, 2 ... Digital communication line, 3 ... Line interface part, 4 ... Central control part, 5 ... Communication path switch, 6 ... Subscriber circuit, 7 ... Digital / analog switching circuit, 8 ... Analog / digital conversion circuit, 9 ... Data bus and address bus, 10a to 10c ... Talk path, 11 ...
... subscriber line, 12a-12b ... single telephone, 13 ... tone memory.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-27554 (JP, A) JP-A-62-137958 (JP, A) JP-A-56-56063 (JP, A) JP-A-1- 248747 (JP, A) JP-A-63-184439 (JP, A)

Claims (2)

(57) [Claims] 1. A private branch exchange to which a digital external line from a digital communication network is connected as an external line, wherein a telephone call for notifying an extension terminal during a telephone call of the incoming call from the digital external line during the telephone call via the digital external line. Generating means for generating an incoming call notification sound; communication path switching means for connecting the extension terminal to the digital outside line during the call or the generation means; and the extension while the extension terminal is talking via the digital outside line. And control means for instructing the communication path switch means to execute a first operation mode for connecting a terminal to the digital external line, wherein the control means controls whether the extension terminal performs a telephone call via the digital external line. When a call is received from a digital outside line during a call, the communication path switch means is instructed to execute a second operation mode for connecting the extension terminal to the generation means. After a lapse of a predetermined time from the instruction, the communication path switching means is instructed to execute the first operation mode, and the voice during the call from the digital external line and the call notification sound from the generation means alternately. A private branch exchange device for alternately instructing the communication path switch means to execute the first and second operation modes so as to be transmitted to the extension terminal. 2. A private branch exchange to which a digital external line from a digital communication network is connected as an external line, wherein a telephone call for notifying an extension terminal during a call via the digital external line of an incoming call from the digital external line during the telephone call. Generating means for generating an incoming call notification sound; synthesizing means for synthesizing the two input voices; speech path switching means; and connecting the extension terminal to the digital external line during a call via the digital external line. Control means for controlling the switch means as described above, wherein the control means, when the extension terminal receives a call from the digital outside line during the call during the call through the digital outside line, the digital outside line A voice during a call from the telephone and a call notification sound during a call from the generating unit are input to the synthesizing unit, and an output synthesized by the synthesizing unit is transmitted to the extension terminal. Private branch exchange apparatus characterized by controlling the urchin said channel switch means.