JPH04123688A - Call connection control system - Google Patents

Abstract

PURPOSE:To prevent line occupancy with a specific media user without using channel assignment procedure by executing the processing of disconnecting a received call when the maximum number of available calls is equal to the number of calls currently used by means of an ISDN connecting part when the ISDN line is shared between or among plural media users. CONSTITUTION:When an incoming call is detected, an ISDN connecting part 1 analizes a call setting message on the controlled channel of an ISDN line 5, obtains an incoming number R1, refers to a column b1 on a media user identification table 6, obtains a media user M on a column b2, refers to a column b3 on a call management table 7 and obtains a maximum number Nmax of available calls on a column b4 and a number Nnow of calls currently used of a column b5. When the maximum number Nmax of available calls exceeds the number Nnow of calls currently used, a connecting processing is executed; while when the maximum number Nmax of available calls is equal to the number Nnow of calls currently used, a disconnecting (DISCONNECT) message is transmitted and the disconnecting processing is executed. Thus, the line occupancy with the specific user can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a processing method during call connection of an ISDN connection device (for example, a network control unit of a terminal, a PBX, etc.) in a multimedia communication processing system using ISDN. In particular, the present invention relates to a call connection control method for identifying a media user to be connected for each incoming call when one physical line is shared by a plurality of media users.

[Prior art]

Conventionally, when using a telephone line, a called number was assigned to each physical line, and the number of calls that could be used simultaneously on one physical line was limited to one. Therefore, by using the called party number as an identification means for one call, one media user can be associated with each call. I
When using an SDN line, information elements included in the call setup (SETUP) message on the control channel (Dch) received at the time of incoming call (for example, transmission capability information) are used to identify the media user to be connected for each call. elements, high layer compatibility information elements, called party number information elements, called party subaddress information elements, etc.). However, as a method for identifying the media user to be connected for each call for all callers, including callers entering the ISDN (Integrated Service Digital Network) from the telephone network, the called party number is used. was. Furthermore, as a method for systematically using multiplexed information channels, a method using a channel designation procedure using a channel identifier information element under an arbitrary channel termination contract condition in a point-to-point connection type has been used.

The technology related to this, for example, is supervised by Hideyoshi Tominaga.

“ISDN Installation Guide for Users Q&A” published by Ohmsha
Ajp 56-59.

[Problem to be solved by the invention]

However, when using an ISDN line, the called party number is given to each interface group (controlled Dch unit), and one interface group has multiple multiplexed information channels (Bchs).
The number of calls that can be used simultaneously in one interface group is plural. Therefore, when using the called number as a means of identifying the media user to be connected for each call,
In the management method for each physical line, similar to traditional telephone lines,
When multiple media users share a physical line, there is a problem in that the line is monopolized by a specific media user. Here, conventionally, a method has been used in which an information channel to be used is assigned to each media user in a reactive manner using a method based on a channel designation procedure. However, channel specification is only possible within an interface group, so if you set up a representative number that spans multiple interface groups, the information assigned to you within the incoming interface group will be used even if other interface groups are empty. There was one point that if the channel was not empty, the call would be lost. Furthermore, because information channels are fixedly allocated, it is difficult to secure a detour channel in the event of a failure, which is an advantage when a physical line is shared by multiple media users.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a channel specification procedure (valid only within an interface group) when an ISDN line is shared by multiple media users. The purpose of the present invention is to provide a technology that can prevent a line from being monopolized by a specific media user without using it.

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[Means to solve the problem]

In order to achieve the above object, the call connection control method of the present invention provides an ISDN connection unit (disguise and
A plurality of media processing units (devices) that process multimedia information input and output via a DN connection unit (device), one or more main control units (equipment W) that control each unit,
In a multimedia communication processing system composed of a plurality of media users who operate the main control unit and communicate using the media processing unit (device), one or more ISDN lines are connected to multiple When shared by the media users, at the ISDN connection unit (device),
Identification means for selecting a media user by analyzing information on a control channel at the time of call connection, and identifying the maximum number of marginal calls that can be used simultaneously for each media user and the number of currently used calls that the media user is currently communicating with. A call number management table to be stored, a process for identifying a media user using the identification means for an incoming call, and a maximum number of marginal calls in use and a number of currently used calls corresponding to the media user in the call number management table. , a process of comparing the maximum number of used marginal calls with the number of currently used calls, a process of managing and connecting the number of currently used calls when the maximum number of used marginal calls is greater than the number of currently used calls, and communication. The most important feature is that it is provided with means for managing the number of currently used calls again after termination, and for disconnecting when the maximum total number of used calls is equal to the number of currently used calls.

[For production]

According to the above-mentioned means, for an incoming call, the process of identifying the media user by identification, and the process of referring to the maximum total number of used calls and the number of currently used calls corresponding to the media user in the call number management table. , a process to compare the maximum total number of calls used and the number of currently used calls, a process to manage and connect the number of currently used calls if the maximum total number of used calls is greater than the number of currently used calls, and a process to connect the current number of calls after communication is completed. The I
When an SDN line is shared by multiple media users, it is possible to prevent a specific media user from monopolizing the line without using a channel specification procedure, and to create a multiplexed information channel (
Bch) can be distributed and used to each media user in a planned manner.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be specifically described using the drawings.

Note that throughout the description of the embodiments, parts having the same functions are given the same reference numerals, and repeated explanations thereof will be omitted.

1 and 2 are block diagrams showing the schematic configuration of an embodiment of the present invention, and FIG. 1 shows a case where there is one main control section (
For example, a terminal device that aggregates a plurality of ISDN@ lines), and FIG. 2 shows an example of a case where there are a plurality of main control units (for example, a system using a PBX).

As shown in FIGS. 1 and 2, the system of this embodiment includes an ISDN connection section (device) 1, a media processing section (device)
2, a main control unit (device) 3, and a media user 4. 5 is the ISDNU line.

As a specific example of media handled by the media processing unit 3,
Examples include telephone, G3FAX, G4FAX, and computer communication procedures.

The ISDN connection unit 1 uses a media user identification table 6, the maximum total number of calls that each media user can use simultaneously, and the current number of calls that each media user can use as a means for identifying media users for each call. It is equipped with a call number management table 7 that is managed and stored.

In this embodiment, as a means for identifying a media user for each call, call setup (
SETUP) A method of using layer numbers obtained by analyzing messages and using a media user identification table 6 in which media users are assigned to each layer number will be described.

An example of the media user identification table 6 is shown in FIG.

A method for identifying a media user is a method that uses information elements other than the 5th destination number (transferability information element, high-order consistency information element, 2nd destination subaddress information element, etc.) as described in the above-mentioned conventional technology. It is also possible to have a media user identification table (Figure 3) corresponding to each method,
It is possible to identify media users.

Further, an example of the call number management table 7 is shown in FIG.

As a method of managing the number of calls for each media user, in addition to the method of managing the numerical values described in this example, there is also a method of managing the number of calls for each media user, in which an area corresponding to the maximum number of total calls used is kept as a table for each media use, and the number of calls currently being used is Another possible method is to manage the number of tables by acquiring and releasing table areas. An example of the call number management table in this case is shown in FIG.

In FIGS. 3 to 5, b19bt9b31b4
．． b is a column, R1 to Rfl are layer numbers, M1 to Mn are media users, N wax is the maximum total number of calls used by media user M1, and N now is the number of calls currently used by media user M1.

Further, FIG. 6 is a flowchart of a call disconnection operation at the time of incoming call in a system to which the present invention is applied.

The call connection method at the time of incoming call in this embodiment is performed in accordance with the following procedure according to FIG.

(101) A calling party makes a call to a media user within the system shown in FIG. 1 or 2.

(102) ISDN connection unit 1 detects an incoming call.

(103) The call setup (SETUP) message on the control channel (DCh) of the ISDN line 5 is analyzed to obtain the called party number R1.

(104) Using the called party number R1, refer to @b1 in the media user identification table of FIG. 4 to obtain the media user M1 of @b2.

(105) Using the media user M1, refer to column b3 in FIG.
Obtain the current number of calls Nnov for b.

(106) Compare the maximum total number of used calls N wax and the current number of used calls N nov. If the maximum total number of used calls Nwax is larger than the current number of used calls Nnov, step 11
Steps 7 to 119 are proceeded to, and if the maximum total number of used calls Nmax is equal to the current number of calls Nnov, proceed to step 127.

(117) The value obtained by adding 1 to the current number of calls N nov is a
b, and performs connection processing. The connection process refers to the media processing unit 2. Main control unit 3. It notifies the media user 4 of the detection of an incoming call, and also sends a response (CONNECT) message to the ISDN line 5 to enable data transfer between the caller 1 and the media user.

(118) Transferring data between the calling party and the media user.

(119) After the communication ends, refer to the current number of calls in 4ai b s, subtract 1 from the value, and store it again.

(127) Sends a DISCONNECT message and performs disconnection processing.

In this way, one ISDN line can be shared by multiple media users by providing a media user identification table and a call number management table in the ISDN connection unit 1 and managing the usage status of each media user. This also has the advantage of preventing a line from being monopolized by a specific media user, and by sharing it, a detour channel can be obtained in the event of a line failure, thereby improving safety.

The present invention has been specifically explained above based on examples, but
It goes without saying that the present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the spirit thereof.

〔Effect of the invention〕

As described above, according to the present invention, when an ISDN line is shared by multiple media users, it is possible to prevent a specific media user from monopolizing the line without using a channel designation procedure, and Information channel (Bch)
It becomes possible to distribute and use the information to each media user in a planned manner.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the conceptual configuration of an embodiment of a system in which the present invention is applied to a device that aggregates multiple ISDN lines. FIG. 2 is an embodiment in which the present invention is applied to a system using a PBX. FIG. 3 is a block diagram showing the conceptual configuration of an example. FIG. 3 is a diagram showing an example of a media user identification table. FIG. 4 is a diagram showing an example of a call number management table when the number of calls is managed numerically. FIG. 5 is a diagram showing an example of a call number management table for managing the number of calls depending on whether an area is in use or not, and FIG. 6 is a flowchart of a call disconnection operation at the time of incoming call in a system to which the present invention is applied. In the figure, l... ISDN connection unit (device), 2... media processing unit (device), 3... main control unit (device), 4...
...Media user, 5...ISDN line, 6...
Media user identification table, 7... Call number management table. b,,b,,b,,b4. b, -- column, R1-Rn・
...Call number 1M1~Mn...Media user, Nm
ax... Maximum total number of calls in use, N now... Number of currently used calls.

Claims (1)

[Claims] (1) ISDN connection section that connects to ISDN and the ISDN
A plurality of media processing units that process multimedia information input and output via the N connection unit, one or more main control units that control each unit, and a plurality of main control units that operate the main control units to control the media processing units. In a multimedia communication processing system composed of a plurality of media users who use and communicate, when one or more ISDN lines are shared by the plurality of media users, the ISDN connection section Identification means for selecting a media user by analyzing information on the control channel at the time of connection, and storing the maximum total number of calls that can be used simultaneously for each media user and the current number of calls that the media user is currently using. a call number management table for incoming calls, a process for identifying a media user using the identification means for an incoming call, and a process for identifying the maximum total number of calls and current number of calls corresponding to the media user in the call number management table. Processing to refer to, processing to compare the maximum total number of used calls with the number of currently used calls, processing to manage and connect the number of currently used calls if the maximum total number of used calls is greater than the number of currently used calls, and termination of communication. The call connection control method is characterized by comprising means for performing processing for re-managing the number of currently used calls, and processing for disconnecting when the maximum total number of used calls is equal to the number of currently used calls.