JPH11136322A - Digital telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve convenience of use by signaling through the line wire if there is another line wire that enables incoming signaling, when an incoming call comes to an ISDN line, while it is temporarily picked up and performing an incoming call rejection notification to the ISDN line if there is no other line wire. SOLUTION: For instance, an ISDN line #1 is divided into two line wires (1) and (2), and when a digital telephone system 3 side depresses a line wire key when each speech channel is in a free state, the line wire (1) is picked up temporarily. When an incoming call arrives at the line #1 in the state, the incoming call is allocated to the line wire (2), and a line wire lamp of the system 3 is performed incoming call display. Also, when an incoming call arrives at the line #1 when the line wire (2) is picked up temporarily and when the wire (1) is in a free state at that time, the incoming call is allocated to the wire (1) and the line wire lamp of the system 3 incoming call display is made. Further, when an incoming call arrives at the line #1 when the wire (2) is picked up temporarily and when the wire (1) is in use because of speech communication, etc., at that time, incoming call rejection notification is performed to the side of the line #1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital telephone device for accommodating an ISDN line.

[0002]

2. Description of the Related Art B1 equivalent to two analog lines
In order to make a call to the other party, the telephone apparatus containing the ISDN line having the two communication channels B1 and B2 first presses the outside line key, and then operates the dial key to input the other party's telephone number. Here, when the input of the other party's telephone number is completed and the dial key "#" indicating the transmission key is pressed,
The ISDN line is seized, the calling protocol is executed via the seized ISDN line, and the other party is called. When the other party answers the call, a call is made with the other party through one of the ISDN communication channels B1 and B2.

[0003]

By the way, in the conventional telephone device, the dial key "#" is pressed after the outside line key is pressed.
Since the ISDN line is not captured until the calling operation is performed, the incoming call may come from the network side to the ISDN line during that time. In such a case, the calling party has not seized the line, so the incoming call has priority, and in this case, the user has made an invalid calling operation and the ISDN line that he / she tried to send is There is a problem that the usability is poor because it is difficult to know the state. Accordingly, it is an object of the present invention to improve the usability of a user when making a call via an accommodated ISDN line.

[0004]

SUMMARY OF THE INVENTION In order to solve such a problem, the present invention accommodates a digital telephone,
In a digital telephone device accommodating an ISDN line having a plurality of communication channels as a plurality of external lines, provisional capturing means for temporarily capturing an empty external line among a plurality of external lines as a calling external line by a predetermined operation, and provisional capturing by the temporary capturing means I in
Detecting means for detecting the presence or absence of another external line capable of notifying an incoming call when an incoming call arrives on the SDN line, and notifying an incoming call to the incoming call capable external line when the detecting means detects another outside line capable of notifying the incoming call. Incoming call notifying means and means for notifying incoming call rejection to the ISDN line when an outside line capable of notifying incoming call is not detected by the detecting means are provided. Further, when the detection means detects another outside line capable of notifying the incoming call, the incoming call notifying means cancels the provisional capture of the provisional outside line, notifies the incoming call via the outside line, and transmits another outside line. This is temporarily captured as an outside line.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a digital telephone device according to the present invention. In the figure, a digital telephone device is a digital office line (hereinafter, ISDN line) #
1, # 2 and analog office line (hereinafter, analog outside line) #
3, the main unit 1 accommodates a # 4 as external, consisting of a main unit 1 to the digital telephone 3 ₁ 3n connected as an extension.

[0006] Main unit 1 includes respective ISDN lines # 1 and # 2.
Digital line unit 1 which is an interface between
1 _1, 11 _2, each of the analog office line # 3, # 4 each station line circuit 12 _1, 12 ₂ analog station line unit 12 having an interface between are provided. Here, the digital central office unit 11 includes a line termination circuit (DSU) 11A for terminating an ISDN line, a transformer T, and an ISDN.
The basic interface controller 11B is a basic interface (2B + D).

Further, the main unit 1, the synchronization unit 13 for synchronizing the detection to the system clock signal (not shown) from the ISDN line to the ISDN line side, of each digital telephone 3 ₁ to 3 _n addressed to business messages A recording / reproducing unit 14 for recording and reproducing, a PB receiver 15 for receiving a PB signal arriving at the apparatus via an external line, a hold sound circuit 16 for sending a hold sound to the external line when the external line is held, a busy tone from the external line ( A BT detection circuit 17 for detecting BT) is provided.

[0008] The main unit 1 also has an ISDN line B
B channel control unit 18 for controlling the timing of sending two communication channels 1 and B2 onto the communication path, time-division multiplex communication path switch 19 which is a communication path, and digital telephone 3 ₁
, A digital telephone 3
Extension circuits 21 ₁ to 2 which are interfaces with _{1 to} 3n
1n, a control unit 22 for controlling each of the above units, a storage unit 23 for storing data, and a power supply circuit 24 for supplying power to each unit of the main device 1 are provided.

On the other hand, as shown in FIG. 2, the digital telephone 3 transmits power to and from the main device 1 and extracts power supplied from the main device 1 via a transmission line to each part of the telephone. A transmission circuit 31, a communication circuit 32, and a CPU 33 for controlling the digital telephone 3 are provided. Here, the CPU 33 is connected to operation units such as an outside line key unit 34 composed of each outside line key, a dial key 35, a function key 36, and a hook switch 37. Also, CP
A memory 38, an LCD display circuit 39, an LED display circuit 40 such as an outside line lamp, and a tone ringer 41 for outputting a ring tone or the like are connected to the U33. Then, a ring tone or the like output from the tone ringer 41 is transmitted from the speaker SP.

[0010] By the way, as is well known, the ISDN line is one.
Each line has two communication channels (communication paths) B1 and B2, and corresponds to two analog lines. Therefore, for example, as shown in FIG. 3, the digital telephone 3 has two external line keys K for the ISDN line # 1.
1 and K2, and external line lamps L1 and L2 are provided corresponding to the external line keys K1 and K2. Also, for the ISDN line # 2, two external line keys K
3 and K4, and external line lamps L3 and L4 are provided corresponding to the external line keys K3 and K4.

Here, when each of the communication channels B1 and B2 of the ISDN line # 1 is in an idle state, the calling side has the ISDN
Dialing the telephone number of line # 1, the ISDN line #
An incoming call arrives at 1. Control unit 22 of the main unit 1 and entering the incoming through the basic interface controller 11B of the digital office line unit 11 _1, the external line lamp digital telephone 3 from the transmission circuit 20 by internal processing L1
Is transmitted to display an incoming call on the outside line lamp L1, and data for driving the tone ringer 41 is transmitted to transmit a ring tone from the speaker SP. Here, when a response operation is performed by pressing the corresponding external line key K1 on the digital telephone 3 side, the control unit 22 that has received the operation data sets the external line lamp L1 of the digital telephone 3 to a busy display. In addition, data is transmitted from the transmission circuit 20 so as to stop the ringing of the ringtone, and the time division multiplex communication path switch 19 is controlled to make the answering telephone 3 talk. In this case, the ISDN notified from the network when the call arrives
A call is made via the call channel B1 of the line # 1.

In a situation where only the communication channel B1 is used for incoming call or communication, other communication channels of the same ISDN line # 1 are in an idle state. Therefore, when the calling side dials the telephone number of the ISDN line # 1, an incoming call arrives at the ISDN line # 1. In this case, the control unit 22 of the main device 1 causes the external line lamp L2 of the digital telephone 3 to display an incoming call by internal processing. Further, in a situation where only the call channel B1 is used, the input of the other party number based on the operation of the outside line key K2 and the dial key 35 of the digital telephone 3 and the "#" key in the dial key 35 indicating the call operation are performed. When pressed, the control unit 22 performs call control via the same ISDN line.
As a result, a call is made via the call channel B2. In this case, the outside line lamp L2 on the digital telephone 3 side indicates that the call is in progress.

As described above, since one ISDN line has two call channels, two calls can be made at the same time, one call and one call can be made at the same time, and two calls can be made at the same time. Are possible at the same time. Therefore,
For example, ISDN line # 1 is divided into two outside lines,
When the outside line key K1 is depressed on the data telephone 3 side when each communication channel is idle, the outside line is temporarily captured, and thereafter the outside line is temporarily captured until the dial input operation and the dial key "#" are operated. Hold. Next, when an incoming call arrives on the ISDN line # 1 while the outside line is in the temporary capturing state, the incoming call is assigned to the outside line, and the outside line lamp L2 of the digital telephone 3 is displayed.

Further, when the outside line is in the provisional capturing state, the ISD
If an incoming call arrives at the N-line # 1 and the external line is idle at that time, the incoming call is assigned to the external line and the external line lamp L1 of the digital telephone 3 is displayed as an incoming call. When the outside line is in the temporary capturing state, an incoming call arrives on the ISDN line # 1, and if the outside line is being used for a call or the like at that time, the incoming call is rejected to the ISDN line # 1. When an incoming call arrives on the ISDN line # 1 when the outside line is in the temporary acquisition state, if the outside line is in use at that time, the ISDN line # 1
Sends a call rejection notification to the party. With this configuration,
When a user attempts to capture and transmit an ISDN line, the problem of invalidating the transmission operation is avoided, and operability is improved.

Next, FIGS. 4 and 5 are flowcharts of the control unit 22 of the main device 1 which performs the above-described operations. FIG.
The operation of the main part of the present invention will be described in more detail with reference to FIGS. In the following description, the communication channel B1 is assigned to the above-mentioned outside line, and the communication channel B2 is assigned to the above-mentioned outside line. When, for example, the outside line key K1 is pressed in the digital telephone 3 to make a call via the ISDN line # 1, the operation data is transmitted to the main device 1 and input to the control unit 22 of the main device 1. Then, the control unit 22 determines that “whether the outside line key is pressed” in step S1 of FIG. 4 is “Y”. In this case, the control unit 22 determines in step S whether the communication channel B1 corresponding to the external line key K1 of the ISDN line # 1 is vacant.
If it is determined in step S2 that the communication channel B1 is free, a timer (not shown) for a predetermined time built in the control unit 22 is started in step S3 in step S3, and the free communication channel number is stored in the storage unit 23 in step S4. To memorize.

Next, upon receiving the dial data transmitted by operating the dial key 35 on the digital telephone 3 side, the control unit 22 determines in step S5 whether or not the dial is valid. In the case of (1), it is determined in step S6 that the dial is not the dial key "#" indicating the call key, and the dial is sequentially stored in the storage unit 23 in step S7. In this way, after the predetermined digit dial number indicating the other party's telephone number is sequentially stored in the storage unit 23,
When the dial key "#" indicating the transmission key is operated and transmitted, the control unit 22 determines "whether the transmission key operation" in step S6 to be "Y".

Then, the control unit 22 reads out the dial data and the idle communication channel number stored in the storage unit 23 and sends them to the basic interface controller 11B of the unit 11, whereby the basic interface controller 11B stores these data. In step S8, a calling process such as performing a calling protocol process based on the calling process is executed. As a result of the transmission processing in step S8, the empty communication channel is changed from the temporary acquisition state to the acquisition state, and the outside line lamp of the digital telephone 3 corresponding to the communication channel is acquired and displayed during communication by the response of the other party.

Here, the digital telephone 3 goes on-hook during a call to the other party and the on-hook data is transmitted to the control unit 22.
Is input, the control unit 22 determines “Yellow” in step S9 to “discard transmission” and performs end processing in step S11. As a result of this termination processing, the corresponding external line lamp of the key telephone 3 is turned off, and the call channel in the captured state becomes idle. In addition, after the outside line key is operated on the digital telephone 3 side, the dial up of a predetermined digit or the transmission key is not operated and the timer times out and the determination in step S10 becomes “Y”. Perform end processing. In this case, the communication channel in the temporary acquisition state is in an idle state.

On the other hand, when the outside line key L1 is operated,
If the corresponding communication channel B1 of the SDN line # 1 is not idle and the determination in step S2 is "N", it is determined in step S12 whether the communication channel B1 is receiving a call. If an incoming call is being received, an incoming call response process for responding to the incoming call is executed in step S13. Note that if the corresponding communication channel is not in an idle state and the call is not being received, error processing is performed in step S14.

Thus, the digital telephone 3 uses the ISDN
When the outside line key is operated to make a call via the line # 1, if the corresponding call channel of the ISDN line # 1 is free, the call channel is stored in the storage unit 23 and the call channel is temporarily captured. And Then, when the other party's number is dialed within the predetermined time of the timer and the transmission key is further operated, the control unit 22 calls the ISDN line # 1 and sets the communication channel to the capture state. Here, during a period from the time when the outside key is pressed on the digital telephone 3 to the time when the transmission key is operated through the dialing operation of the other party number (that is, when the corresponding communication channel is in the temporary acquisition state), the ISDN line # If there is an incoming call to No. 1, the network side determines that the ISDN line # 1 has an idle communication channel and terminates the call on the ISDN line # 1.

In this case, the control unit 22 of the main device 1
Is determined to be "Y" in step S21, and the process proceeds to step S22 for determining whether there is a communication channel other than the stored channel. Here, assuming that the temporarily acquired communication channel stored in the storage unit 23 is B1, if the communication channel B2 other than the communication channel B1 is in an idle state, the determination in step S22 is “Y”.
At this time, if an incoming call arrives from the network side and the communication channel notified at that time is B1, the determination of the same channel in step S23 is "Y".

In this case, the control unit 22 performs a channel switching process in step S24 so as to notify the incoming call through the vacant communication channel B2, and in step S25, the incoming call is performed using the communication channel B2. The permission signal is notified to the network side via the ISDN line # 1. Thus, on the network side, the incoming channel is changed from the communication channel B1 to the communication channel B2.
Is changed to Thereafter, the control unit 22 controls the digital telephone 3
An incoming call process such as an incoming call display of the outside line lamp L2 corresponding to the communication channel B2 and a ring tone sounding process is executed in step S26.

If the communication channel B2 other than the temporarily acquired communication channel B1 is in an idle state, and the communication channel notified by the network together with the incoming call is B2, the determination of the same channel in step S23 is made in step S23. N ".
In this case, a process of notifying the incoming call is performed by the communication channel B2 notified from the network side, and the digital telephone 3
Of the outside line lamp L2 corresponding to the communication channel B2. Further, when an incoming call is detected, there is no vacant channel other than the tentatively acquired speech channel in step S2.
If the determination in Step 2 is “N”, the control unit 22 proceeds to Step S2
In step 7, a call rejection notification is sent to the network side via the ISDN line # 1 to abandon the incoming call, and the call channel being temporarily acquired is secured so that the call channel can be used as a call.

If the communication channel B2 other than the temporarily acquired communication channel B1 is in an idle state, and the communication channel notified by the network together with the incoming call is B1,
The control unit 22 can notify the incoming call by using the communication channel B1, and change the communication channel B2 to the temporary capturing state. Further, the communication channel B1 other than the temporarily acquired communication channel B2 is in an idle state, and at this time, the communication channel notified from the network side together with the incoming call is B2.
If so, the control unit 22 can notify the incoming call through the communication channel B2 and change the communication channel B1 to the temporary capturing state. In this case, since the channel according to the notification from the network side is used as the incoming call notification channel, the transmission of the permission signal to the network side becomes unnecessary.

As described above, when an incoming call arrives on the ISDN line while the ISDN line is in the provisional acquisition state, the communication channel notified at that time is in the provisional acquisition state, and there is another available communication channel, Incoming call is notified through an available communication channel, or the available communication channel is set to a temporary capture state, and the network side is notified to notify the incoming call through the communication channel, thereby temporarily capturing the communication channel. The state is controlled so that the calling operation through the ISDN line of the user is enabled. Also, when the ISDN line is in the temporary acquisition state,
If an incoming call arrives at the DN line and there is no other available communication channel, a notification of rejection of the incoming call is made to the ISDN line side to secure a temporary capturing state of the communication channel and to perform the communication via the user's ISDN line. This is the one in which the outgoing call operation is enabled.

It is also possible to set whether to enable temporary capture or to enable incoming calls. If incoming is set to be valid, temporary capture is performed without notifying the ISDN line side of rejection of incoming calls. It is possible to cancel the state and make an incoming call.
Further, when notifying the ISDN line of the rejection of the incoming call, the digital telephone 3 notifies the digital telephone 3 of the arrival of the incoming call.

[0027]

As described above, according to the present invention, a vacant out of a plurality of outside lines is provisionally acquired as a transmission outside line by a predetermined operation, and an incoming call is notified when an incoming call arrives on the ISDN line during the provisional acquisition. If there is another outside line that can be notified, the call is notified via that outside line, but if there is no other outside line that can notify the incoming call, the call is rejected to the ISDN line. Even if an incoming call arrives when trying to make a call, there is an effect that the user's calling operation is ensured and the usability of the user is improved. Also, when another outside line that can be notified of an incoming call is detected, the temporary acquisition of the outside line being temporarily acquired is released, the incoming call is notified via the outside line, and the other outside line is temporarily acquired as the outgoing outside line. Therefore, the outgoing operation performed by the user can be similarly enabled.

[Brief description of the drawings]

FIG. 1 is a block diagram of a main device constituting a digital telephone device of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a digital telephone.

FIG. 3 is a diagram showing an arrangement state of external line keys and external line lamps of the digital telephone.

FIG. 4 is a flowchart showing a first main part operation of the main device.

FIG. 5 is a flowchart showing the operation of a second main part of the main device.

[Explanation of symbols]

1 ... main unit, 3 ₁ to 3 _n ... digital telephones, # 1, # 2
... Digital office line (ISDN line), 11 ₁ and 11 ₂ ... Digital office line unit, 19 ... Time division multiplex communication path switch, 20, 31 ... Transmission circuit, 21 _{1 to} 21 _n ... Extension circuit, 22 ... Control unit, 23: storage unit, 33: external line key unit,
40 ... LED display circuit, K1-K6 ... Outline key, L1-
L6: Outside line lamp.

Claims (2)

[Claims] 1. A digital telephone device accommodating a digital telephone and accommodating an ISDN line having a plurality of communication channels as a plurality of outside lines, wherein a vacant outside line among the plurality of outside lines is temporarily determined as a transmission outside line by a predetermined operation. Provisional capturing means for capturing; detecting means for detecting the presence or absence of another outside line capable of notifying an incoming call when an incoming call arrives on the ISDN line during temporary capturing by the temporary capturing means; An incoming call notifying means for notifying an incoming call to an incoming call-notifiable external line when another external line is detected; and a means for notifying an incoming call rejection to the ISDN line when the detecting means does not detect an outside line capable of receiving an incoming call. A digital telephone device comprising: 2. The method according to claim 1, wherein, when another outside line capable of notifying incoming call is detected by the detection means, the incoming call notifying means cancels provisional capture of the outside line being provisionally captured and passes through the outside line. A digital telephone device for notifying an incoming call and temporarily capturing the other outside line as a calling outside line.