JP3033668B2 - Calling / receiving method for ISDN multi-line line of exchange or key telephone - 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 (PBX) and a key telephone which is an extension terminal thereof. This is related to the outgoing / incoming system for setting the PBX button telephone line.

[0002]

2. Description of the Related Art A key telephone of a digital multi-function telephone connected to an extension of a PBX is a function button for selecting an outside line, transferring, holding, etc., its display lamp, dial number,
It has an indicator for displaying numbers such as call charges. For a PBX that subscribes to the Integrated Services Digital Network (ISDN), for example,
When using the 23B + D channel of the ISDN interface for the outside line, that is, the office line, the plurality of extension telephones are divided into small groups,
In addition, a 23-line office line is divided to form a group of several lines, and in each group, a multi-line system is used in which the line number of the office line corresponding to the group is fixedly assigned to the external line buttons of a plurality of telephones. . Such a multi-line system has the advantages of reducing collisions during simultaneous external line transmission, distributing non-dial-in general incoming calls to extension telephones, and reducing the number of buttons on each telephone. When calling from a key phone,
The user presses the outside line button of the vacant display to dial and, in the case of an incoming call, presses the outside line button of the incoming call display to respond.

[0003]

As is well known, ISDN lines have line numbers corresponding to the number of B channels. However, in the conventional method as described above, the line at the time of outgoing call is determined by the outside line button pressed, and when the desired channel is a channel of another group of telephones in the negotiation of channel setting between the user and the network. , Could not change channel.
Further, when there is an incoming call to a B channel other than the B channel assigned to the outside line button, there is a disadvantage that the outside line button cannot respond to the incoming call.

It is an object of the present invention to provide a key telephone exchange which can solve the above-mentioned drawbacks of the prior art and can freely set the correspondence between an external line button and a channel.

[0005]

According to the present invention, there is provided a telephone set having a line set on a plurality of channels connected to an integrated service digital communication network and an outside line button corresponding to the line number of the line. Communication channel means to be accommodated;
Control means for setting a communication path through the communication path means between the telephone and the line in response to an outgoing / incoming call of the telephone, a line telephone exchange including line occupancy data for managing occupancy of a plurality of lines, Control means for storing channel occupancy data for managing occupancy of a plurality of channels, and call control data corresponding to a line in which a channel number and a channel group number used for each of the outgoing and incoming calls are set; Refers to the line busy / busy data, the channel busy / busy data and the call control data of the storage means in response to the outgoing / incoming call ,
An arbitrary empty channel is set for the outside line button, and a communication path through the communication path means is set between the telephone and the line. Update blockage data and call control data.

[0006]

According to the present invention, the line-by-line call control data corresponding to the line is provided in the storage means of the key telephone exchange, and the control means comprises:
In response to the outgoing / incoming call, the communication path passing through the communication path means is set between the telephone and the line with reference to the line busy / busy data, the channel busy / busy data and the call control data in the storage means. These data are updated by the control means in response to the outgoing and incoming calls. As a result, an arbitrary free B channel can be set as the external line button regardless of the line assignment of the external line button of the key telephone.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a key telephone exchange according to the present invention;

FIG. 2 is a relay system diagram showing an embodiment of the present invention. The key telephone 10 is a digital multifunctional telephone provided with outside line buttons 11 to 14 and corresponding display lamps. The key telephone 10 is connected to a private branch exchange (PBX) 16 through a subscriber line 15 and functions as an extension terminal of the private branch exchange 16, and although only one is shown in FIG. The private branch exchange 16 is connected to an integrated services digital network (ISDN) 18 through an external line, i.e.
Is a 64 Kb / s 23 B + D channel of the ISDN interface, and includes 23 lines of 64 Kb / s B channel.

The external line buttons 11 to 14 of the key telephone 10 include:
A predetermined line is allocated by a conventional multi-line system. That is, the office line 17 using the 23 B + D channel of the ISDN interface is divided into several lines to form one group, and the plurality of extension telephones 10 are divided into small groups by several units. In each group, the line number of the station line 17 corresponding to the group is assigned to the outside line button of the plurality of telephones 10. At the time of outgoing / incoming call from outside line, one of the outside line buttons 11 to 14 is pressed, and at the time of general incoming call, the private branch exchange 16 displays incoming call connection on a lamp of the outside line button corresponding to the incoming line. This system differs from the conventional system in that, at the time of outgoing / incoming calls, an arbitrary free B channel is set to correspond to the external line button regardless of the line assignment of the external line buttons 11 to 14 of the key telephone 10.

FIG. 1 is a functional block diagram showing an embodiment of a key telephone line setting system according to the present invention. The private branch exchange 16 is a time-division communication path switch (TS) for transferring a digital communication signal between the key telephone 10 and the office line 17 shown in FIG.
And the communication path switch 19 is a telephone control circuit (L) 21
It is connected to a plurality of key telephones 10 via a subscriber line 15. Although not shown, other extension terminals such as a facsimile terminal and a data terminal are also connected to the subscriber line 15. The call path switch 19 is also
(T) 25 is connected to the station line 17.

The private branch exchange 16 is a digital exchange for making an extension call connection between extension terminals via a call path switch 19 and for making a call connection between the extension terminal and the office line 17.
The key telephone 10 is connected to the telephone control circuit 21 from the subscriber line 15.
This is a digital telephone that transmits and receives interface signals as digital signals to and from the private branch exchange 16 through the telephone. The interface signals include, for example, an on-hook / off-hook signal sent from the telephone 10, an outside line number by pressing the outside line buttons 11 to 14 in FIG. 2, a dial signal, a call signal transmitted and received in both directions, and a private branch exchange. There are communication control signals from 16 and so on. The telephone control circuit 21 is a circuit which transmits and receives signals under the control of the central processing unit (CPU) 22 in the outgoing / incoming connection of the key telephone 10 and relays a call signal with the call path switch 19. The external line trunk 25 is controlled by the central processing unit 22 to control the ISDN 1 in the external line connection.
8 is a circuit for transmitting / receiving a signal to / from, and relaying a call signal between the call path switch 19 and the office line 17.

The central processing unit 22 is connected to a ROM memory 23 for storing an exchange processing program and a RAM memory 24 for registering exchange processing data in a rewritable manner. This is a control circuit for performing a replacement process of the private branch exchange 16. Data memory 24 of FIG.
Contains a map and data whose state is set by the central processing unit 22 every time an external call is generated. These maps and data include the following, as can be seen from FIG. That is, the line occupancy map 30 (FIG. 4) indicates the occupied state of each of the office lines 17 having the maximum capacity accommodated by the private branch exchange 16, in this embodiment, the office lines 17 for 32 lines. Therefore, one map 30 is prepared in the system. The line-by-line call control data 31 (FIG. 5) is provided corresponding to each of the office lines 17 and includes information necessary for each line. These pieces of information include, for example, an ISDN interface number and a B channel number assigned to the used line each time an external call occurs. B channel vacancy map 32 (Fig. 6)
Are prepared for each interface, and indicate an idle state of the B channel. FIG. 6 is an example of the primary group interface.

For the sake of explanation, the outside line buttons 11 to
It is assumed that line numbers # 1 to # 4 of the station line 17 are assigned to 14 (FIG. 2). Referring to FIG. 7, for example, when outside line button 11 is pressed in outgoing line transmission, line number # 1 of station line 17 is sent to telephone control circuit 21 of private branch exchange 16. Central processing unit
22 is the line number # 1 in the line occupancy map 30 of the memory 24.
Is empty, and if empty, the area of line number # 1 is closed and displayed. Thereafter, when the called party number is received from the key telephone set 10, the call setup message (SETUP) 100 with the channel information element identifier set to an arbitrary channel is edited and transmitted to the ISDN 18 from the external trunk 25 having the line number # 1. . A call setup acceptance message (CALL-PROC) 101, a call message (ALER
T) 102 and the response message (CONN) 103 are received including the channel designation. At this time, it is checked whether or not the designated B channel is empty by referring to the channel information element identifier. If it is free, the designated B channel is displayed in the B channel empty / busy map 32, and the B channel number to be used this time is set in the line-by-line call control data 31, and the line number is set.
Save # 1. When the designated B channel is blocked,
Save the line number # 1 and perform release processing. Communication ends,
When releasing the call, the used B channel in the B channel occupancy map 32 is displayed empty, and the B channel number recorded in the line-by-line call control data 31 is cleared.

Referring to FIG. 8, when an external call arrives, the IS
Upon receiving the call setup message (SETUP) 200 from the DN 18, the central processing unit 22 refers to the channel information element identifier in the message 200, and if this is designated as B channel changeable, the B channel empty / busy map. At 32, it is checked whether the designated B channel is empty. If it is empty,
A vacant line in the interface group that has received the call is searched for and captured by the line vacancy map 30.
Thereafter, the designated B channel is displayed in the B channel empty / occupied map 32, and the B channel number is set in the line-by-line call control data 31 corresponding to the captured line, and the used channel is stored. At the same time, a call setup acceptance message (CALL-PRO
C) Send 201 back.

Referring to FIG. 9, when a designated B channel is closed and a channel changeable call setup message (SETUP) is received.
A case will be described below in which 200 is received or a call setup message 201 is received by designating an arbitrary channel with reference to FIG. In these cases, a vacant line in the interface group where the call arrived is captured by the line occupancy map 30, and then the vacant B channel in the interface group is stored in the B channel occupancy map 32. To find and capture. The B channel number is set and stored in the line-by-line call control data 31 corresponding to the captured line. In this case, a call setup acceptance message (CALL-PR
When transmitting OC) 202, the indication of the captured B channel is added to the channel information element identifier of the message and transmitted.

Referring to FIG. 11, as in FIG.
Call setup message (SETUP) specified to allow channel change
When 200 is received, the designated B channel is busy,
If the other B channels are also full, or if all the B channels in the interface group are full, a release completion message (REL-COMP) 203 indicating that there is no available line / channel is transmitted. .

If both the B channel and the line can be captured in the above-described incoming call to the outside line, the incoming call is notified to the telephone 10 having the outside line button to which the captured line number is allocated. This incoming call is visually displayed on the lamp of the button corresponding to that of the telephone 10. When both the B channel and the line can be captured during the transmission / reception to / from the external line 17, the central processing unit 22 sets the communication path switch 19 to the communication path between the extension terminal and the B channel.

As described above, by using the configuration in which the used B channel number is recorded in the line-by-line call control data 31 corresponding to each line of the outside line every time an outgoing / incoming call is made, it is assigned to the outside line button of the key telephone 10. Any free B channel can be set for the registered line. Therefore, even if the telephone 10 has only one outside line button, there is no problem.

[0019]

As described above, according to the present invention, an arbitrary free B channel can be set in a line registered corresponding to an outside line button of a key telephone. As a result, the B channel can be designated from the network side, and the call loss of the communication network is reduced. In addition, an incoming call from any B channel can be answered with one outside line button. Further, the incoming call order can be set for a plurality of outside line buttons of the key telephone.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing an embodiment of a key telephone exchange according to the present invention.

FIG. 2 is a diagram illustrating a relay system of the embodiment shown in FIG. 1;

FIG. 3 is an explanatory diagram showing an example of a data array of a data memory in the embodiment.

FIG. 4 is a diagram showing a configuration example of a line occupancy map of FIG. 3;

FIG. 5 is a diagram showing a configuration example of line-by-line call control data of FIG. 3;

FIG. 6 is a diagram illustrating a configuration example of a B channel empty / occupied map in FIG. 3;

FIG. 7 is a diagram illustrating a sequence of signal transfer between the exchange and the network at the time of transmission in the embodiment.

FIG. 8 is a diagram exemplifying a case where a designated channel is blocked in a signal transfer sequence between the exchange and the network at the time of an incoming call;

FIG. 9 is a diagram illustrating an example of a case where an empty channel is captured in a sequence of signal transfer between the exchange and the network at the time of an incoming call;

FIG. 10 is a diagram exemplifying a case of an incoming call on an arbitrary channel in a sequence of signal transfer between the exchange and the network at the time of an incoming call;

FIG. 11 is a diagram showing an example of a case where a line and a B channel are blocked in a sequence of signal transfer between an exchange and a network at the time of an incoming call;

[Explanation of symbols]

 10-key telephone 11-14 Outside line button 15 Subscriber line 16 Private branch exchange 17 Outside line 18 ISDN 19 Time-division communication path switch 21 Telephone control circuit 22 Central processing unit 23, 24 Memory

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-269035 (JP, A) JP-A 1-282990 (JP, A) JP-A 62-143379 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) H04Q 3/58 107

Claims (2)

(57) [Claims] 1. A communication line means for accommodating a line set on a plurality of channels connected to an integrated service digital communication network, and a telephone having an outside line button corresponding to the line number of the line, and the telephone Control means for setting a communication path through the communication path means between the telephone and the line in response to an outgoing / incoming call of the button telephone exchange, the exchange comprising: Line occupancy data to manage, channel occupancy data to manage the occupancy of the plurality of channels, and call control data corresponding to a line in which a channel number and a channel group number used for each of the outgoing and incoming calls are set. Storage means for storing the line busy / busy data, the channel busy / busy data, and the call control of the storage means in response to the outgoing / incoming call. Referring to the data, set an arbitrary vacant channel to the outside line button
And setting a communication path passing through the communication path means between the telephone and the line, and updating the line occupancy data, channel occupancy data and call control data in response to the outgoing / incoming call. Key telephone switchboard. 2. The key telephone exchange according to claim 1, wherein said key telephone has at least one outside line button.