JPH01191597A - Communication system - Google Patents

Abstract

PURPOSE:To transmit a call to a prescribed terminal among plural terminals on the same transmission line by referring to stored communication information, at the time of receiving an incoming, adding the subaddress of a terminal to be connected determined from the source number of an incoming-call-information and transmitting the incoming-call-information to said terminal. CONSTITUTION:A private branch exchange(PBX) 1 stores a source number B and a destination number A included in call (call-setting message) information from a terminal 31, and stores the subaddress C of a terminal 23 that comes busy then ends communication therein corresponding to the source number B and the number A. This means that the PBX stored the fact that the call from a terminal on a transmission line 3 out to a transmission line 2 is the communication achieved by a subscriber at a terminal 23. In case a call is thus made, the PBX refers to the communication information stored in itself to obtain the subaddress of the terminal to be connected out of the source number in the incoming call information, then adds this subaddress to said information and transmits the result to said terminal. As a result, the call can reach the particular terminal amount the plural terminals on the same transmission line.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a communication system in an exchange that controls communications of a plurality of terminals connected in the form of a bus to the same transmission path.

(Conventional technology) In recent years, communication networks including new media have developed significantly.
2. Description of the Related Art In order to provide more advanced and faster communication services using communication methods, plans are being made to transition from analog communication to digital communication.

Currently, the CCITT (International Telegraph and Telephone Consultative Committee) is considering the international standardization of digital communications.
DN (Comprehensive Service Digital Network) is a typical example.

According to ISDN, a variety of services will be realized by integrating communication networks that previously provided services for each type of terminal, such as telephone networks, data communication networks, and facsimile networks, into a single network. .

For example, the I SDN basic interface specified in the CCITT I series recommendations has two information channels used for information communication between terminals, control information communication for incoming and outgoing calls between terminals and exchanges, and communication between terminals. By multiplexing and transmitting common signal channels used for information communication, up to eight terminals can be bus-connected on the same transmission path, making it possible to communicate between multiple terminals at the same time.

In this case, each information channel is 64 kbps,
The common signal channel has a capacity of 16 kbps, and the switching equipment performs switching control in units of 64 kbDs information channels based on arrival and departure control information via the common signal channel.

FIG. 3 is a diagram for explaining the configuration of a private branch exchange system in the above-mentioned ISDN basic interface.

Here, extension communication using a telephone terminal in a private branch exchange FI (hereinafter referred to as PBX) will be explained as an example.

In the figure, numeral 1 denotes a private branch exchange (PBX) that accommodates an ISDN basic interface line, and performs exchange and connection processing for various communication terminals.

2.3.4 is the internal transmission line of the PBXI, and A, B, and C are assigned as line numbers, respectively. The line number indicating the transmission path in the PBX is the same as the extension number, and the following explanation will be given assuming that the extension numbers are AB and C.

Further, terminals 21, 22, and 23 are connected to transmission line 2, terminal 31 is connected to transmission line 3, and terminal 41.42 is connected to transmission line 4, respectively. In addition to extension numbers A, B, and C, each terminal is assigned a unique subaddress; terminal 21 has subaddress a, 22 has subaddress b, 23 has subaddress C1, terminal 31 has subaddress d, and terminal 41 has subaddress e.
And the terminal 42 is set to f.

Next, in the system configuration shown in FIG. 3, a detailed description will be given of a sequence in which a subscriber of the terminal 31 of the transmission line 3 calls and communicates with a subscriber of the transmission line 2.

FIG. 4 shows the incoming call sequence when three terminals are connected in the ISDN basic interface. This corresponds to the sequence when the terminal 31 makes a call to the subscriber on the transmission line 2 in FIG.

In FIG. 4, the originating terminal 31 and the terminating terminal 21.2
Terminals 21, 22, and 23 have the same attributes as telephone terminals, and terminals 21, 22, and 23 are connected to transmission line 2 by a bus.

First, when the subscriber on the calling side (f4A terminal 31) makes a call, he or she picks up the handset (on-hook) as before.
, enter the called party number (extension number) (in this case, enter the transmission line 2
extension number A), then a call setup message is sent to the PBX.

This call setup message includes information elements such as transmission function (indicating the functions and attributes of the voice terminal and data terminal), called number (A), and calling number (in this case, extension number B of transmission path 3). ing. In this case, the calling terminal 31 adds the calling number to the call setup message, but it is also possible for the PBX to add the calling number.

The PBX performs connection processing to the called party based on the information elements in the call setup message from the calling party.The PBX sends the call setup message (incoming call) to the transmission path corresponding to the called party number.
Send. The terminal that received this incoming call setup message will transmit the paging message to the PBX if the transmission function is the same.
and generates a ring tone.

Therefore, in FIG. 4, terminal 21.22.23
sends a paging message and enters the paging state. In response to this call, when the called subscriber picks up the handset of the terminal 23 (on-hook), the terminal 23 sends a response message back to the PBX, and the PBX notifies the calling party that the called terminal has responded by means of a response message. Notice.

As a result, the calling terminal 31 becomes in communication with the terminal 23. At the same time, the PBX sends release messages to terminals 21 and 22, putting terminals 21 and 22 into the initial state.

When the call ends, the calling party hangs up the handset (on-hook), and the calling terminal sends a disconnection message to the PBX, and after the release sequence ends, the system returns to the initial state.

In a communication system such as the ISDN basic interface where multiple terminals are connected to the same transmission path, if the attributes of the terminals are the same when receiving a call, the multiple terminals will return a response and generate a ring tone. .

(Problem to be solved by the invention) By the way, such a system is very convenient in ordinary homes or in individually divided locations, but it is not possible to use a private branch exchange where multiple subscribers use terminals on the same transmission path. In some cases, it is difficult to determine which terminal a subscriber is receiving a call from, and carrying out the procedure for receiving a call from multiple terminals on the bus places a large burden on the PBX software. .

The present invention has been made to solve such problems, and an object of the present invention is to provide a communication system that can receive calls to a predetermined terminal among a plurality of terminals on the same transmission path. - [Structure of the Invention (Means for Solving the Problems)] The present invention provides a system in which a plurality of terminals are connected to the same transmission path via an exchange in the form of a bus, and each time a communication is performed, an incoming Memorize communication information that associates the calling number of the notification with the subaddress of the terminal that communicated on the called side, and connect from the calling number of the incoming notification by referring to the stored communication information when a call is received. The sub-address of the terminal to be called is determined and this sub-address is added to notify the incoming call.

(Function) In the present invention, when an incoming call is received, the sub-address of the terminal to be connected is determined from the calling number of the incoming call notification by referring to the stored communication information, and this sub-address is added to the incoming call notification. Therefore, a call can be received at a predetermined terminal among a plurality of terminals on the same transmission path.

Therefore, the exchange only needs to carry out the incoming call sequence for this specific terminal, and it is possible to make the ring tone sound only for that terminal.

(Example) Hereinafter, details of an example of the present invention will be described based on the drawings.

FIG. 1 is a diagram showing the procedure of an embodiment of the present invention.

In this embodiment, the bus connection 2 of the transmission line 2 is connected from the terminal 31 of the transmission line 3 to the bus connection 2 of the transmission line 2, as explained in the conventional example of FIGS. 3 and 4.
In the communication sequence with 1.22.23, the PBX stores the calling number (B in this case) and the called number (A in this case) in the call origination (call setting message) information from the terminal 31,
Furthermore, the subaddress C of the terminal 23 that was in the middle of a call and ended the communication is stored in correspondence with the calling numbers B and A.

This means that the PBX remembers that the subscriber of terminal 23 communicated with the incoming call from the terminal of transmission path 3 to transmission path 2.

In FIG. 1, from the terminal 31 to the terminals 21, 22, .
23 shows the communication sequence from the second time onwards.

In this embodiment, as explained in FIG. 4, the subscriber at terminal 31 goes on-hook and dials the subscriber number A of the other party. As a result, a call setting message indicating a call origination is transmitted from the terminal 31 to the PBX.

When the PBX searches to see if calling number B in this call setup message has any memory of communicating with subscriber number A in previous communications, the PBX searches for subscriber number A, that is, transmission line 2, from the stored contents. It can be seen that communication was previously conducted with terminal 23 (subaddress C).

Therefore, the PBX adds the called subaddress C to the incoming call information (call setting message) to the transmission path 2 and transmits the message.

Terminal 21.22.23 that received this call setup message
compares the called number and called subaddress in each call setup message with its own address, and if they match, returns the message.

In this case, since only the terminal 23 matches the called subaddress C in the call setup message, other terminals 21.2
Terminal 2 ignores the call setup message and does not send anything back.
Only 3 paging messages are sent back to the PBX.

Further, the ringing tone will also sound only on the terminal 23. This makes it possible to notify only the subscriber of the terminal 23 on the transmission path 2 of the incoming call from the terminal 31.

I SDN basic interface usually uses PB
Since X is not concerned with the sub-addresses of terminals connected to the transmission path, a means for the PBX to recognize and manage the sub-addresses of terminals is required.

In other words, when configuring the system, set the sub-address for each terminal in advance. - Notify the sub-address from the terminal to the PBX. - Request that the PBX notify the terminal of the sub-address. The PBX can recognize the sub-address of the terminal.

Next, a communication sequence in another embodiment of the present invention will be described.

FIG. 2 is a diagram for explaining a communication sequence when a call is transferred to another terminal on the same bus after the call is in progress as explained in FIG. 1.

In the figure, after the subscribers of terminal 31 and terminal 23 are engaged in a call, terminal 23 transmits an interruption message to the PBX for transfer to terminal 22. The PBX notifies the terminal 23 that it has accepted the interruption message by means of an interruption confirmation message.

Thereafter, in order to resume the interrupted communication, the terminal 22 transmits a resume message to the PBX, and returns a resume confirmation message as a response from the PBX. As a result, the terminal 22 becomes in communication with the terminal 31, and the originating terminal 31 goes on-hook, resulting in an initial state after the disconnection procedure.

In the case of the sequence shown in FIG. 2, the PBX sends the subaddress b of the terminal 22 that last completed communication to
By storing this in correspondence with the called party's extension number A, in response to the next call setting message for the calling number B and number A,
It operates to add the destination subaddress b to the incoming call setup message.

In other words, an incoming call from the terminal 31 to the transmission path 2 is sent to the terminal 22 (
Only subaddress b) will be notified.

In each of the embodiments described above, extension communication of a telephone terminal via a PBX has been explained as an example, but the same applies not only to telephones but also to data terminals and facsimiles. Moreover, it can be applied not only to internal line communication but also to external line communication.

Furthermore, in each of the above-described embodiments, the calling number stored by the PBX can be configured not only by an extension number but also by adding a subaddress.By considering communication between transmission lines connected to a bus, You can expect great effects.

That is, in the system explained in FIG. 3, the terminal 41 (sub address e) on the transmission line 4 was previously
PB indicates that communication with subaddress a) has ended, and that terminal 42 on the same transmission path 4 (subaddress f) has also ended communication with terminal 22 on transmission path 2 (subaddress b) in the past.
If X has memorized the extension number C (transmission line 4) and subaddress as the calling number as described above,
Communication from terminal 41 to transmission path 2 is to terminal 21, and to terminal 4
2 to the transmission path 2, it becomes possible to notify the terminal 22 of the incoming call.

Furthermore, in each of the embodiments described above, the terminal sub-address is added to the incoming message based on the latest information stored in past communications, that is, the most recently stored communication information. In order to determine the terminal sub-address at which the call should be received, it is effective to select the sub-address based on the history of past communication information.

For example, if there are multiple caller numbers and memories corresponding to caller numbers for incoming calls in the stored past communication information, the most suitable information for incoming calls can be selected from among them, such as the number of communications or the duration of the call. Depending on the length etc.
It is also possible to select.

Further, this communication information can be configured to be updated sequentially for each communication to store the learned content.

[Effects of the Invention] As explained above, when a call is received, the communication system of the present invention refers to the stored communication information to determine the sub-address of the terminal to be connected to from the calling number of the incoming call notification. Since the notification of incoming call is sent to the terminal with a subaddress added, it is possible to receive the call to a predetermined terminal among the plurality of terminals on the same transmission path.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining the incoming call sequence in a communication system according to an embodiment of the present invention, FIG. 2 is a diagram for explaining the incoming call sequence in another embodiment of the present invention, and FIG. Diagram for explaining the configuration of the communication system,
FIG. 4 is a diagram showing a communication sequence of conventional bus-connected terminals. 1...PBX, 2-4...Internal transmission line, 21-23
．． 31.41-43...Terminal. Applicant Toshiba Corporation Patent Attorney Sasa Suyama - Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (1) In a communication system in which a plurality of terminals are connected like a bus to the same transmission path via an exchange, the exchange
A storage means for storing communication information in which a caller number of a call notification in each communication is associated with a sub-address of a terminal that communicated on the called side each time a communication is performed; 2. A communication system comprising sub-address adding means for determining a sub-address of a terminal to be connected from a calling number of an incoming call notification by referring to the communication information in the incoming call notification, and adding this sub-address to the incoming call notification.