JP3075061B2 - Private branch exchange - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private branch exchange.

[0002]

2. Description of the Related Art Conventionally, a private branch exchange that can use a digital key telephone, an analog key telephone, and a standard telephone as extension terminals automatically determines the type of telephone connected to each extension. Have a function. Specifically, the conventional extension interface device automatically determines whether or not a telephone using two pairs of wires per extension is connected, and has a function of operating even if any type of telephone is connected to the extension. have.

[0003] Among conventional digital key telephones, an analog key telephone and a standard telephone are connected in parallel to one extension port, or a digital key telephone and a standard telephone are connected in parallel. Some can be used as

[0004]

However, in the above conventional system, the analog key telephone and the standard telephone connected in parallel to one extension port both have the same telephone number and share the same communication path. , It was controlled as one extension. The same applies to a parallel connection of a digital key telephone and a standard telephone.

[0005] Therefore, in a mode in which the key telephone and the standard telephone are used by different persons, there is a problem that privacy cannot be kept or two telephones cannot be used for different calls at the same time. .

The present invention has been made in view of the above problems, and when a digital key telephone and a standard telephone are connected to one extension port and used, each telephone can operate as a completely different extension. The purpose is to provide a possible private automatic exchange.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an event determining means for determining whether or not an event has been received, and determining information on the type of terminal in the event, and a telephone number of the extension. A standard telephone interface means for controlling a standard telephone, an analog key telephone interface means for controlling an analog key telephone, and a digital key telephone interface means for controlling a digital key telephone. A first call processing means for controlling a call processing of a telephone corresponding to the first telephone number, a second call processing means for controlling a call processing of a telephone corresponding to the second telephone number, and the standard telephone interface means. Switching means for connecting to either the first call processing means or the second call processing means.

[0008]

According to the above construction, one of the four-wire extension ports is used.
When a digital key telephone is connected to a pair, it is possible to connect a standard telephone operable as a completely different extension to the remaining pair, so that two lines can be used as completely different extensions. The number of extensions accommodated is twice the number of extension ports.

[0009]

(Embodiment 1) A first embodiment of the private branch exchange according to the present invention will be described below. FIGS. 1 and 2 are block diagrams showing the configuration of a private branch exchange according to the first embodiment of the present invention. FIGS. 3 to 5 are flowcharts showing control procedures of the private branch exchange according to the first embodiment of the present invention. is there.

In FIG. 1, reference numeral 100 denotes a private branch exchange. Reference numeral 200 denotes a digital key telephone connected to the private branch exchange 100 as an extension terminal device. 30
Reference numeral 0 denotes a standard telephone connected to the private branch exchange 100 as an extension terminal device.

The extension modular jack 123 provided in the private branch exchange 100 is a four-wire type which can connect four terminals.

When the digital key telephone 200 is connected, two terminals at both ends of the four terminals of the extension modular jack 123, that is, terminals a and d are used. That is, the data line 121 for connecting the digital key telephone 200 to the private branch exchange 100 is 2
One of the two lines of the data line 121 is connected to the terminal a, and the other line is connected to the terminal d.

When the standard telephone 300 is connected, the central two terminals of the four terminals of the extension modular jack 123 are connected.
Terminals, namely terminal b and terminal c, are used. That is,
One of two analog lines 122 for connecting the standard telephone 300 to the private branch exchange 100 is connected to a terminal b, and the other is connected to a terminal c.

In FIG. 2, reference numeral 400 denotes a private branch exchange 1
00 is an analog button telephone connected as an extension terminal device. Analog key telephone 4 as shown in FIG.
00 is connected to the extension modular jack 123
All terminals a, b, c, d are used. That is, the analog key telephone 400 is connected to the private branch exchange 100
To connect to the extension modular jack 123
And a pair of analog wires 122 connected to the terminals b and c of the extension modular jack 123.

Next, the configuration of the private branch exchange 100 will be described. 101 is a control unit, and 102 is a storage unit. 103 is a time-division voice switch unit, 113 and 11
Reference numeral 4 denotes a digital audio highway for transmitting signals of a plurality of channels by time division multiplexing.
Reference numeral 3 denotes exchange connection of a plurality of communication paths by exchanging data between time slots on the digital audio highways 113 and 114.

For example, CH1 is assigned as a channel for the digital key telephone set 200 connected to the extension port # 1, and CH2 is assigned as a channel for the standard telephone set 300 connected to the same extension port # 1. . CH3 is assigned as a channel for the digital key telephone 500 connected to extension port # 2, and CH4 is assigned to the same extension port # 2.
Is assigned as a channel for the standard telephone set 600 connected to. Thus, the digital audio highways 113 and 114 and the time-division audio switch
3, the digital audio highways 113 and 114
The above shows two channels for each extension port. In other words, since the digital key telephone 200 and the standard telephone 300 have independent communication channels at the extension port # 1, even if both telephones are used at the same time, no interruption occurs in the other party's communication.

The control section 101 controls each section described later by using the information stored in the storage section 102 in accordance with the flowcharts shown in FIG.

Reference numeral 105 denotes a first call processing unit for performing a first call process for the extension port # 1, and a telephone corresponding to the first extension number (in this example, the digital key telephone 20)
The call processing of 0) is performed.

Reference numeral 106 denotes a second call processing unit for performing a second call process for the extension port # 1, and performs a call process for a telephone (standard telephone 300 in this example) corresponding to the second extension number. These call processings include receiving off-hook and dialing events from the telephone, sending dial tones to the telephone, and controlling telephone exchange such as ringing the bell of the telephone to be dialed. Say.

A switching unit 104 manages a combination of each telephone and each call processing unit. For example, standard telephone 3
It switches between the first call processing unit 105 of extension port # 1 and the second call processing unit 106 of extension port # 1.

Reference numeral 108 denotes an A / D key telephone interface unit which performs transmission / reception processing of a data signal with the digital key telephone 200. Further, as shown in FIG. 2, the terminals a, b, c,
When the analog key telephone 400 using the four-wire d is connected, processing for transmitting / receiving a data signal to / from the analog key telephone 400 is also performed. The analog voice of the analog button telephone is processed in a standard telephone interface unit 110 described later.

Reference numeral 109 denotes a voice signal / control signal division multiplexing unit which divides a data signal for the digital key telephone 200 into a voice signal and a control signal, and multiplexes a voice signal and a control signal to conversely multiplex the voice signal and the control signal.
Is performed as a data signal for

Reference numeral 110 denotes a standard telephone interface unit which performs standard telephone processing such as dial reception from the standard telephone 300, and has a function of transmitting a bell signal via the analog line 122, a function of monitoring a DC loop current, and the like. Reference numeral 112 denotes a DC loop current monitoring unit which is provided in the standard telephone interface unit 110 and monitors a DC loop current of the analog line 122 and a pulse dial transmitted from the standard telephone 300. An A / D converter 111 converts an analog audio signal into a digital signal, and conversely converts a digital signal into an analog audio signal.

The operation of the embodiment constructed as described above will be described with reference to FIGS. 3 to 5 show the control unit 10.
1 shows a flowchart in which the switching unit 104 controls each unit.

First, it is determined whether or not an event for the extension port has been received (S001).
If not, there will be reception until the event is received /
The absence determination is continued. If there is a reception event, it is determined whether the source of the event is the digital key telephone 200 or the standard telephone 300 (S002, S003).

When the source of the event is the digital key telephone 200, the first call processing unit 1 is used as the first extension.
The process proceeds to (S100) for processing at 05. In FIG. 4, first, the first call processing unit 105 is activated (S101),
Various processes are executed according to the event (S102). The voice in this case is provided on the digital voice highway 113 at CH1, and is exchanged by the time-division voice switch unit 103 (FIG. 1).

Next, if the digital key telephone 20
If there is a transmission event for 0, the event is transmitted to the digital key telephone 200 via the digital key telephone interface unit 108 (S10).
4) Then, the first call processing unit 105 is stopped (S10).
5). If there is no transmission event (S103), the first call processing unit 105 is stopped (S105).

In FIG. 3, if the event transmission source is the standard telephone set 300 (S003), it is determined whether the extension port registered in the storage unit 102 has one extension number.
Or, it is determined whether the information has two extension numbers (S00
4). If there is only one extension number, the process proceeds to (S100) to process as the first extension.

In FIG. 4, first, the first call processing unit 105 is activated (S101), and various processes corresponding to the event are executed (S102). The sound in this case is shown in FIG.
After the A / D conversion in the standard telephone interface unit 110, it is controlled by the CH 2 on the digital audio highway 113, and is exchanged by the time-division audio switch unit 103.
Next, if there is a transmission event to the standard telephone 300 (S103), after transmitting the event via the A / D button telephone interface unit 108 (S10).
4), the first call processing unit 105 is stopped (S105).

In FIG. 3, if there is a second extension number in the corresponding extension port, that is, if the second extension number is registered in the storage unit 102 (S004), the standard telephone 300 of the standard telephone 300 is in the first place. Discard the received event because use is not allowed.

If the source of the event is not the standard telephone set 300 (S003), it is determined whether the extension port registered in the storage unit 102 has one extension number or two extension numbers. (S005). if,
If there is only one extension number, the process proceeds to (S100) to process as the first extension. In FIG. 4, first, the first call processing unit 105 is activated (S101), and executes various processes according to the event (S102). In this case, the audio in FIG.
After D conversion, CH2 on digital audio highway 113
And exchanged by the time-division voice switch unit 103. Next, if there is a control event for the standard telephone 300 (S103), control is performed via the standard telephone interface unit 110, and the first call processing unit 105 is stopped (S105).

On the other hand, if there are two extension numbers in FIG. 3 (S005), the process proceeds to (S200) to process as a second extension. In FIG. 5, first, the second call processing unit 106 is activated (S201), and executes various processes according to the event (S202). The sound in this case is also controlled by CH2 in the same manner as described above.
Replaced by Next, if there is a control event for the standard telephone 300 (S203), control is performed via the standard telephone interface unit 110 (S204).
Finally, the second call processing unit 106 is stopped (S205).

The operation sequence of the control unit 101 performing the above-described operation will be described with reference to an actual sequence flow.

FIG. 6 (a) shows a digital telephone set 200 connected to the same extension port to a standard telephone set 30.
9 is a sequence flow showing a control procedure of each control unit when calling 0. In FIG. 6B, the extension port # 1 of the storage unit 102 has the extension number {2} {0} {0} as the first extension number and the extension number as the second extension number in advance.
{3} {0} {0} is registered. And extension port # 1
As shown in FIG. 1, a digital key telephone 200 is connected as a first extension telephone, and a standard telephone 300 is connected as a second extension telephone.

When the digital key telephone 200 goes off-hook, the off-hook event passes from the A / D key telephone interface unit 108 to the audio signal / control signal division multiplex unit 109, where the control signal is switched on the control signal. It is taken into the unit 104. The switching unit 104 uses the extension port # 1 because the event transmission source is the digital key telephone 200 of the extension port # 1.
The first call processing unit 105 is activated (S101 in FIG. 4). In the first call processing here, the state of the extension is set to dial reception by the received off-hook event, and the dial tone is connected to CH1. As a result, the digital key telephone 200 hears a dial tone.

In this state, the digital key telephone 20
Extension number {3} from 0 to the second extension of extension port # 1
When {0} and {0} are dialed, the dial event is switched along the same route as the off-hook event.
4

The switching unit 104 activates the first call processing unit 105 of the extension port # 1 because the event transmission source is the digital key telephone 200 of the same extension port # 1 (S101 in FIG. 4). In the first call process here, the extension data table (FIG. 6B) of the storage unit 102 is searched by the received dial event, and the number {3} {0} is retrieved.
Since the extension corresponding to {0} is the second extension of jack 1, a call request event is transmitted to the second call processing unit 106 of extension port # 1.

In response to the call request event, the second call processing by the second call processing unit 106 of extension port # 1 is started. In other words, at this time, if the self-extension status can be received,
A call response event is sent to the first call processing unit 105 in response to the call request event, and the second telephone, the standard telephone 3
Ring the 00 bell and change the extension state to incoming.

In response to the call response event generated by the second call processing unit 106, the first call processing of the extension port # 1 is started, and the extension state of the digital telephone 200, which is the first telephone, is being called. And the ringback tone is connected to CH1. As a result, in the digital key telephone 200, a ringback tone indicating that a ring tone is being transmitted to the extension telephone corresponding to the extension number {3} {0} {0} is heard.

Next, the example of FIG. 7 will be described. FIG.
(A) is a sequence flow showing a control procedure of each control unit when an incoming call occurs to the digital key telephone 200 and the standard telephone 300 connected to the same extension port. In this example, as shown in FIG.
It is assumed that the second extension number is not registered in the extension port # 1.

When the digital key telephone 500 of the extension port # 2 goes off-hook and the extension number {2} {0} {0} belonging to the extension port # 1 is dialed, the extension port # 2.
In the first call processing unit 107, the extension data table (FIG.
(B)) is searched. Since the extension corresponding to extension number {2} {0} {0} is the first extension of jack 1, a call request event is sent to first call processing unit 105 of extension port # 1. The first call processing of the extension port # 1 is started by this call request event, and if the own extension state can be received,
In response to the call request event, a call response event is sent to the first call processing unit 107 of the extension port # 2.

Here, the self-extension data table (FIG. 7B)
, But in this example, the second
Is not registered, even if two telephones are connected to extension port # 1, they are treated as the same extension. That is, the digital key telephone 2
00 and the standard telephone 30
Ring the 0 bell. Further, the extension state is set to incoming and the process is stopped.

The first call processing of the extension port # 2 is started by the call response event by the first call processing of the extension port # 1, and the extension state of the digital key telephone 500 as the first telephone is set to the extension. Assume that the call is ringing, and connect a ring back tone to CH1. As a result, the digital key telephone set 500 hears a ringback tone indicating that a ring tone is being transmitted to the extension telephone set corresponding to the extension number {2} {0} {0}.

If the extension port # 1 has the second extension number in FIG. 7, in the first call process of the extension port # 1, a call response event is generated for the call request event. After transmission to the first call processing unit 107 of the port # 2, the self extension data table shown in FIG. 7 (b) is searched, and only the digital key telephone 200 is registered in response to the registration of the second extension number. Ring the bell.

Next, the example of FIG. 8 will be described. FIG.
The example of (a) is a sequence flow showing a control procedure of each control unit when the digital key telephone 200 and the standard telephone 300 connected to the same extension port transmit simultaneously. In this example, as shown in FIG.
Extension number # 2 as the second extension number for extension port # 1
It is assumed that {3} {0} {0} has been registered. It is also assumed that a digital key telephone 200 is connected to the extension port # 1 as the first extension telephone as shown in FIG. 1, and a standard telephone 300 is connected to the extension port # 1 as the second extension telephone.

When the digital key telephone 200 connected to the extension port # 1 goes off-hook, the off-hook event is sent to the A / D button telephone interface 1
From 08, the signal passes through the audio signal / control signal division multiplexing unit 109, where it is put on the control signal and is taken into the switching unit 104 of the control unit 101. The switching unit 104 controls the digital key telephone 2 whose event transmission source is extension port # 1.
00, the extension port # 1 first call processing unit 10
5 is started (FIG. 4-S101). First call processing unit 105
In the first call processing, the state of the extension is set to dial reception by the received off-hook event, and the dial tone is connected to CH1. As a result, the digital key telephone 200 hears a dial tone.

When the standard telephone set 300 connected to the extension port # 1 goes off-hook, the off-hook event is taken from the standard telephone interface section 110 on a control signal and taken into the switching section 104 of the control section 101. Since the event transmission source is the standard telephone 300 of the extension port # 1, the switching unit 104
Of the extension data table (FIG. 8 (b)), and activates the second call processing unit 106 of the extension port # 1 when the second extension number {3} {0} {0} is registered. .

In the second call process of the second call processing unit 106, the state of the extension is set to dial receiving and the dial tone is connected to CH2 by the received off-hook event. As a result, the standard telephone 300 can hear the dial tone. Thereafter, when the telephone is dialed from both telephones, it is controlled by the first call processing and the second call processing, respectively, and operates as two independent extensions.

As described above, in this embodiment, when a digital key telephone is connected to a pair of telephone extension ports without changing the configuration of the 4-wire extension port used in the conventional analog key telephone, Since it becomes possible to connect a standard telephone which can operate as a completely different extension to the remaining pair, the number of extensions accommodated in the system becomes twice as many as the number of extension ports, and the practical effect is large.

Embodiment 2 Hereinafter, a second embodiment will be described with reference to the drawings. Private branch exchange 1 shown in FIG.
At 00, the A / D key telephone interface unit 108 exchanges data with the analog key telephone 400 via the data line 121.
Contains. Reference numeral 115 denotes a DTMF signal receiving unit which receives a digitized digital signal transmitted from the standard telephone 300 via the analog line 122, the standard telephone interface unit 110, the A / D conversion unit 111, and the time division voice switch unit 103.
Receive a TMF signal. In the storage unit 102, parallel connection enable / disable information as to whether the analog key telephone 400 and the standard telephone 300 can be connected in parallel and used as a parent / child telephone is registered for each extension.

The operation of the second embodiment configured as described above will be described with reference to FIG. FIG. 9 is a flow chart showing a control procedure when a paging call arrives at the extension port to which analog key telephone 400 is connected. Referring to FIG. 9, when a paging from another extension is received (step 22) while the extension is waiting (step 21), the voice announcement of the paging caller is transmitted from the speaker of the analog key telephone 400. Then, the speaker-on data is transmitted to the analog key telephone 400 via the data communication unit 116 (step 23), and a communication path from the paging call extension to the extension is formed (step 24). A transition is made to paging reception (step 25).

Next, when the analog key telephone 400 turns on the speaker, the switch in the analog key telephone 400 is automatically closed and the analog line 12
2, a DC loop current flows. Therefore, during paging reception, the DC loop current of the analog line 122 is detected via the DC loop current monitoring unit 112 (step 2).
6). At this time, the parallel connection availability information of the extension registered in advance in the storage unit 102 is checked (step 27). If the registration content is acceptable, the analog line 122 and the DTMF are checked.
The signal receiving unit 115 is connected to the signal receiving unit 115 by the time-division voice switch unit 103 (step 28), and a paging response from the standard telephone set 300 is monitored.
The analog line 122 and the DTMF signal receiving unit 115 are not connected.

Next, a process of responding to a paging incoming call will be described. First, a normal analog key telephone 40
In the case of paging response processing of 0, when the analog key telephone 400 goes off hook, the off hook of the analog key telephone 400 is detected via the data communication unit 116 (step 29), and the unused DTMF signal receiving unit 115 is released. (Step 30) The state of the extension is shifted to receiving a dial (step 31), and the paging response dial from the analog key telephone 400 is monitored. When the paging response number is dialed by the analog key telephone 400, it is detected via the data communication unit 116 (step 32), and a communication path between the paging call extension and the extension is formed (step 33). It is assumed that the state of the extension is "extension in progress" (step 34).

On the other hand, the process when the standard telephone 300 makes a paging response is as follows. That is, when the user of the standard telephone 300 hears a paging incoming call from the analog key telephone 400, goes off-hook the receiver, and operates a key to input a paging response number, this is transmitted to the DTM
The F signal receiving unit 115 detects (step 35), forms a communication path between the paging call extension and the extension (step 33), and sets the state of the extension to "internal call" (step 3).
4).

As described above, in the second embodiment, when a paging call arrives at the analog key telephone, the DT
By monitoring the DTMF signal by the MF signal receiving means, it is possible to analyze the DTMF signal from the standard telephone used in parallel with the analog key telephone. Therefore, when an analog button telephone and a standard telephone are connected in parallel to one extension port and used, a paging response from the standard telephone becomes possible.
When the analog key telephone and the standard telephone are set apart from each other, a paging response can be made from the standard telephone when there is no person at the analog key telephone, which is easy to use. Further, since the DTMF signal receiving means is used only when the pre-registered parallel connection availability information is acceptable, the system can be realized with a smaller number of DTMF receiving means than the number of extensions, thereby suppressing an increase in cost.

[0056]

As described above, according to the present invention, an event discriminating means for judging the presence or absence of an event and discriminating the type of a terminal involved in the event, a memory means for storing a telephone number of an extension, and a standard telephone Standard telephone interface means for controlling the analog telephone, and analog button telephone interface means for controlling the analog telephone.
Digital key telephone interface means for controlling the digital key telephone; first call processing means for controlling call processing of the telephone corresponding to the first telephone number;
Second call processing means for controlling the call processing of the telephone corresponding to the telephone number of the first telephone number, and switching means for connecting the standard telephone interface means to either the first call processing means or the second call processing means. Thus, when a digital key telephone is connected to one pair of the 4-wire extension ports, it is possible to connect a standard telephone operable as a completely different extension to the other pair. It can be used as a completely different extension, and the number of extensions accommodated in the system can be apparently doubled.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of a private branch exchange according to a first embodiment of the present invention.

FIG. 2 is a configuration block diagram of a private branch exchange according to the first embodiment of the present invention.

FIG. 3 is a flowchart showing a control procedure of the private branch exchange according to the first embodiment of the present invention.

FIG. 4 is a flowchart showing a control procedure of the private branch exchange according to the first embodiment of the present invention.

FIG. 5 is a flowchart showing a control procedure of the private branch exchange according to the first embodiment of the present invention.

FIG. 6A is a sequence chart showing a control procedure of each control unit when a standard telephone is called from a digital key telephone connected to the same extension port in the private branch exchange according to the first embodiment of the present invention. Flowchart (b) shows a registration data table indicating the contents of the storage unit in the private branch exchange according to the first embodiment of the present invention.

FIG. 7A is a control procedure of each control unit when an incoming call occurs to a digital key telephone and a standard telephone connected to the same extension port in the private branch exchange according to the first embodiment of the present invention; (B) is a diagram showing a registration data table indicating the contents of the storage unit in the private branch exchange according to the first embodiment of the present invention.

FIG. 8 (a) shows a control procedure of each control unit when a digital key telephone and a standard telephone connected to the same extension port simultaneously transmit a call in the private branch exchange according to the first embodiment of the present invention. FIG. 7B is a diagram illustrating a registration data table indicating the contents of a storage unit in the private branch exchange according to the first embodiment of the present invention.

FIG. 9 is a flowchart showing a control procedure when a paging call arrives at an extension port to which an analog key telephone is connected in the private branch exchange according to the second embodiment of the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 100 private branch exchange 101 control unit 102 storage unit 103 time division voice switch unit 104 switching unit 105 first call processing unit 106 second call processing unit 108 analog / digital button telephone interface unit 109 voice signal / control signal division multiplex unit 110 standard Telephone interface unit 111 Analog / digital conversion unit 112 DC loop current monitoring unit 113, 114 Digital audio highway 121 Data line 122 Analog line 123 Extension modular jack 200 Digital button telephone 300 Standard telephone 400 Analog button telephone

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04M 3/42 H04Q 3/58-3/62

Claims (8)

(57) [Claims] 1. An extension port having a 4-wire extension port
Digital key telephone and standard telephone
In sometimes connected to the available private automatic branch exchange, to determine the presence or absence of reception of an event in one four-wire extension ports, and event determination means for determining the type of terminal involved in the event, of the certain 4-wire digital performed and the standard telephone interface means for performing signal exchange for a standard telephone connected to the 2-wire extension port, a signal exchange for digital key telephone set to be connected to the remaining two-wire extension port of the certain 4-wire Button telephone interface means , corresponding to said two lines at said certain 4-wire extension port
And storage means for storing a first extension and a second extension corresponding to the remaining two-wire, first performing the call processing terminal corresponding to the first extension
The performing the call processing means, the call processing terminal corresponding to the second extension 2
When an event occurs in the call processing means and the certain 4-wire extension port, the first call processing means determines whether the telephone associated with the event is the digital key telephone according to the output of the event determination means. A switching unit for performing processing and switching to perform processing by the second call processing unit if the telephone associated with the event is the standard telephone. 2. All four wires of said certain 4-wire extension port
2. An automatic private branch exchange according to claim 1, further comprising an analog button telephone interface means for performing transmission / reception processing of a data signal with an analog key telephone connected to said telephone. 3. An extension line having a 4-wire extension port.
Digital key telephone and standard telephone
In sometimes connected to the available private automatic branch exchange, to determine the presence or absence of reception of an event in one four-wire extension ports, and event determination means for determining the type of terminal involved in the event, of the certain 4-wire Standard telephone interface means for exchanging signals for a standard telephone connected to two lines of an extension port, and digital type for exchanging signals for a digital key telephone connected to the remaining two lines of the certain 4-wire extension port Key telephone interface means; and a digital voice highway having a plurality of channels time-division multiplexed, wherein at least two
A digital voice to which a channel is assigned and a digital signal transmitted through the digital key telephone interface means is loaded on one channel and a digital signal converted into a digital voice by the standard telephone interface means is loaded on the other channel. A highway, a time-division voice switch unit for switching the communication path by exchanging data between the channels on the digital voice highway, and a two-line switch corresponding to the certain 4-wire extension port.
And storage means for storing a first extension and a second extension corresponding to the remaining two-wire, first performing the call processing terminal corresponding to the first extension
The performing the call processing means, the call processing terminal corresponding to the second extension 2
When an event occurs at the call processing means and the certain 4-wire extension port, the first call processing means determines whether the telephone associated with the event is the digital key telephone according to the output of the event determination means. Switching means for performing processing and switching the processing to be performed by the second call processing means if the telephone associated with the event is the standard telephone. 4. All four wires of said certain 4-wire extension port
4. An automatic private branch exchange according to claim 3, further comprising an analog button telephone interface means for performing transmission / reception processing of a data signal with an analog key telephone connected to said telephone. 5. An extension port having a 4-wire extension port
Digital key telephone and standard telephone
In sometimes connected to the available private automatic branch exchange, to determine the presence or absence of reception of an event in one four-wire extension ports, and event determination means for determining the type of terminal involved in the event, of the certain 4-wire It is provided for a standard telephone connected to the two lines of the extension port, sends a bell signal via an analog line,
Standard telephone interface means for performing processing for standard telephone processing such as dial reception from a standard telephone, analog / digital voice conversion, etc., and a digital key telephone connected to the remaining two lines of the above-mentioned 4-wire extension port. A digital button telephone interface means for transmitting / receiving data signals to / from a digital key telephone, separating / combining a voice signal and a control signal on the data signal, and a plurality of channels being time-division multiplexed Digital voice highway, with at least 2 per extension port
A digital voice to which a channel is assigned and a digital signal transmitted through the digital key telephone interface means is loaded on one channel and a digital signal converted into a digital voice by the standard telephone interface means is loaded on the other channel. A highway, a time-division voice switch unit for switching the communication path by exchanging data between the channels on the digital voice highway, and a plurality of extension ports provided for each of a plurality of extension ports, each of which can be connected to four terminals and a extension jack such four-wire, two terminals of the four terminal extension jack each extension port connect to the digital key telephone set interface means, said digital button extension jack When a telephone is connected, a data line is connected to these two terminals so that the digital key telephone and the digital key telephone interface means are electrically connected to each other, and four terminals of an extension modular jack of each extension port are provided. the remaining two terminals in the lead to the standard telephone interface means, and the if you connect the standard phone extension jack connected analog lines to the two terminals between the standard telephone set the standard telephone interface means It is configured to conduct, and corresponds to the two wires at the certain 4-wire extension port.
And storage means for storing a first extension and a second extension corresponding to the remaining two-wire, first performing the call processing terminal corresponding to the first extension
The performing the call processing means, the call processing terminal corresponding to the second extension 2
When an event occurs in the call processing means and the certain 4-wire extension port, the first call processing means determines whether the telephone associated with the event is the digital key telephone according to the output of the event determination means. A switching unit for performing processing and switching to perform processing by the second call processing unit if the telephone associated with the event is the standard telephone. 6. All four wires of said certain 4-wire extension port
An analog key telephone interface means for transmitting and receiving a data signal to and from an analog key telephone connected to the analog key telephone; the two terminals are connected to the analog key telephone interface means; 6. The premises according to claim 5, wherein when the analog key telephone is connected to the terminal, a data line is connected to the two terminals so that the analog key telephone and the analog key telephone interface means are electrically connected. Automatic exchange. 7. Standard telephone interface means for exchanging signals with a standard telephone, key telephone interface means for transmitting / receiving data signals to / from a key telephone, and transmitted from the standard telephone via an analog line. DTMF signal receiving means for receiving a DTMF signal, and communication path means for connecting or opening a communication path between an extension port and the DTMF signal reception means, wherein the key telephone and the standard telephone are connected to one extension port. When both are connected, when the key telephone of the extension port is receiving a page, the DC loop current of the analog line is monitored by the standard telephone interface means of the extension port, and at the extension port. When a DC loop current is detected, the communication path means is controlled to control the standard telephone. Private automatic branch exchange, characterized in that a control means to allow paging response by the standard telephone set connected to the DTMF signal receiving means. 8. A standard telephone interface means for exchanging signals with a standard telephone, an analog button telephone interface means for performing transmission / reception processing of a data signal with an analog key telephone, and a signal exchange with a digital key telephone. Digital button telephone interface means; DTMF signal receiving means capable of receiving a DTMF signal transmitted from the standard telephone; a digital voice highway in which a plurality of channels are time-division multiplexed; A time-division voice switch unit for switching connection of a communication path by exchanging data between channels, and the analog key telephone or the digital key telephone and the standard telephone are both connected to one extension port. Where you are When the key telephone of the extension port receives a page, the DC loop current of the analog line is monitored by the standard telephone interface means of the extension port, and the DC loop current is detected at the extension port. And a control means for controlling the time-division voice switch unit to send a signal from the standard telephone to the DTMF signal receiving means so that the standard telephone can make a paging response.