JPH04255155A - Connection management method in isdn terminal - Google Patents

Abstract

PURPOSE:To improve the effective utilization rate of an Integrated Services Digital Network(ISDN) line by registering address information and attribute information of an opposite ISDN terminal in pairs to a table and interconnecting opposite terminals through the reference of the table. CONSTITUTION:A storage means 12 of each ISDN terminal interconnected via ISDN network 13 is provided with a table in which address information representing an address of each opposite terminal 11 and attribute information representing its attribute are stored with cross reference, the attribute information is rewritten automatically on each interconnection and the table having the newest attribute information is referenced to implement inter-communication. Thus, even when the configuration of the opposite ISDN terminal is changed, the change is followed and the probability of erroneous dialing processing is reduced and an event of disabled communication is avoided.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is directed to an ISDN (Integrated Network) system which has built-in storage means necessary for mutual communication.
Service Digital Network
) relates to a connection management method in a terminal, particularly in an ISDN terminal; With the construction of an ISDN network in which a large number of ISDN terminals are interconnected, each line has been digitized, and it has become possible to communicate multiple pieces of information such as voice, data, facsimile, etc. on a single line at transmission speeds suitable for each line. A multimedia communication network is realized here. The present invention proposes an improved plan for mutual communication between ISDN terminals in an ISDN multimedia communication network in which various media coexist.

0002

2. Description of the Related Art It is essential for ISDN terminals to have built-in storage means (memory) for mutual communication. For example, the IS disclosed in JP-A No. 2-053354
The DN terminal includes a storage means in which address information of the other party's ISDN terminal and communication means identification data are stored. When setting up a call from an ISDN terminal to the other party's ISDN terminal, address information is obtained from the key input pressed to make the call, the storage means is accessed with the address information, and the other party's ISDN terminal receives voice information. Identification of whether the terminal is a communication terminal, a line-switched data communication terminal, a packet-switched data communication terminal, etc. is performed based on the accessed communication means identification data. Then, for example, the packet switching data communication mode identified here is activated in the ISDN terminal, and a call is made for call setup.

0003

SUMMARY OF THE INVENTION In an ISDN multimedia communication network, it is assumed that the ISDN terminal configuration of each subscriber is not fixed but changes dynamically. For example, a certain ISDN line is usually an IS that functions as a telephone.
Even though it is connected to a DN terminal, it may be temporarily connected to a laptop computer. Furthermore, each subscriber is not limited to only one type of ISDN terminal; in addition to telephone function terminals, facsimile function terminals and data communication function terminals (such as personal computers) can be connected at the same time. There are cases where For such subscribers, the type of ISDN terminal changes.

[0004] When the configuration of the other party's ISDN terminal to which the call is made changes dynamically as described above, under the above-mentioned prior art, it is difficult to determine which ISDN terminal corresponds to the communication means identification data stored in the storage means. Different types of ISD
A call will be made to terminal N, resulting in incorrect call processing. In other words, if the configuration of the ISDN terminal is changed, there is a problem that mutual connection between the two ISDN terminals becomes impossible and communication becomes impossible.

SUMMARY OF THE INVENTION Therefore, in view of the above-mentioned problems, it is an object of the present invention to reduce the probability of erroneous call processing being performed when interconnecting ISDN terminals that communicate with each other.

[0006]

FIG. 1 is a diagram showing the basic steps of a connection management method according to the present invention. In this figure, in step a, pairs of address information and attribute information regarding the other party's ISDN terminal are formed as a table. In step b, interconnection with the other party's ISDN terminal is executed with reference to the table.

[0007] In step c, attribute information paired with address information is automatically rewritten each time there is interconnection. From then on,
Steps b and c are repeatedly executed in this order.

[0008]

[Operation] By adding step c to step b above, the storage means is provided with a learning function for attribute information. As a result, a table having the latest attribute information is always formed in the storage means, and even if the configuration of the other party's ISDN terminal changes dynamically, it can be flexibly followed. Therefore, the probability of erroneous call processing being performed is greatly reduced, and the worst situation of communication failure can be avoided as much as possible.

[0009]

Embodiment FIG. 2 is a diagram showing an outline of an ISDN communication system to which the present invention is applied. In this figure, the ISDN communication network has a large number of ISDN terminals (only three are shown) 11, each of which has a built-in storage means (memory) 12 described above, and these ISDN terminals 11 are connected to the ISDN network 13 and their respective subscriptions. Mutual communication is performed via the personal line 14.

FIG. 3 is a diagram showing an example of the configuration of an ISDN terminal according to the present invention. This is a so-called multimedia compatible ISDN terminal, with telephone function section (TEL) 21,
It includes a data communication function section (DATA) 22, a facsimile function section (FAX) 23, and the like. In addition, in the figure, 24 is a console section consisting of various input operation means including a numeric keypad, function keys, etc., and 28 is the above-mentioned functional section (21,
22, 23), the console section 24, and the aforementioned memory 12 for holding tables and programs.
Furthermore, it is a processor (CPU) that controls the ISDN interface (INF) 29 via the common bus BS. This interface unit 29 is a part that processes the ISDN protocol for connecting to the ISDN network 13 (FIG. 1) via the subscriber line 14.

[0011] As described in the section of the above-mentioned function, the essence of the present invention is to provide the ISDN terminal 11 with a learning function of attribute information. In this case, the learning function must naturally be performed automatically by the ISDN terminal 11 at its own discretion. The essence of the present invention will be specifically explained below. First, what attribute information is will be explained with reference to FIG. FIG. 4 is a diagram showing an example of a table formed in the storage means 12. In the figure, numeral 30 is a table formed as a part of the storage means 12, in which the above-mentioned attribute information is written and registered. Note that each attribute information is each address information (three arbitrarily extracted address information AD3, AD4, AD5).
(for example)).

[0012] A unique table 30 is formed in the storage means 12 in each ISDN terminal 11, and includes, for example, address information AD3 for a certain partner ISDN terminal with which mutual communication is to be performed.
Assign. If the other party's ISDN terminal is a circuit-switched terminal, it will be indicated, and if the information to be exchanged with this other party's terminal is voice data, this will be indicated. If not, or if this is mainly used, register it as attribute information in the corresponding area of AD3.

[0013] The above attribute information is re-registered as new information by the ISDN terminal itself using the learning function described above. In order to realize this learning function, the embodiment of the present invention uses a setup (SETUP) frame for call setup. This setup frame is essential when starting mutual communication with the other party's ISDN terminal. Typically, an ISD
Before an N terminal can interconnect with the other party's ISDN terminal, it first transmits a setup frame to the other party. When the attributes of the other party and the attributes of yourself (sender) match, the other party sends a message “RELEASE COMPLET”.
E” is returned.Therefore, this “RELEA” is returned.
SE COMPLETE", it will not be possible to recognize that they have the same attributes, and the transmission and reception of original information (voice, facsimile, etc.) will not begin.

FIG. 5 is a diagram showing the format of the setup frame. In this figure, "transmission capability" indicates whether it is a circuit-switched system or a packet-switched system. Of the "calling number/calling sub-address", the calling number indicates the dial number of the user (sender), and the calling sub-address indicates the dial number of the own terminal (the sender), and the calling sub-address indicates the number of functions (21
, 22, 23, etc.), it indicates which functional unit is making the call. Among the "called number/subaddress," the called number indicates the dial number of the other party's (called destination) terminal, and the called subaddress is used to specify the called destination of one of the various functional units. "Higher layer compatibility" indicates whether the caller is making a call from a telephone, facsimile, etc. The above is the basic attribute information, and in addition to this, there is also "user user" information. This is information individually and arbitrarily negotiated with a specific ISDN terminal, and can be used freely.

[0015] Examples according to the present invention will be described below. These examples include an example (A, B, and C) in which learning is performed when a setup frame is received from a partner ISDN terminal, and an example (D, E, and F) in which learning is performed when a setup frame is transmitted to a partner ISDN terminal. It is broadly divided into Other embodiments (G and H) relate to operations during transmission.

Embodiment A The ISDN terminal that has received a setup frame for call setup from the other party's ISDN terminal, i) the other party's ISD written in the received setup frame;
Search the internal table 30 for address information indicating terminal N. ii) As a result of the search, if the address information is not registered in the table 30, the address information and the attribute information of the ISDN terminal are newly registered as a pair in the table; If so, the table 30 is updated by rewriting the attribute information already registered in the part of the table corresponding to the address information with the attribute information written in the setup frame just received.

Embodiment B i) An area for writing a table update permission flag is set in the setup frame, for example, in the "user" information section, in order to display whether or not the table 30 may be updated. The ISDN terminal that has received the setup frame from the partner ISDN terminal ii) monitors the table update permission flag written in the received setup frame.

iii) As a result of the monitoring, Table 3
If updating of 0 is permitted, the internal table 30 is updated, and if not permitted, the contents of the table 30 are saved as they are. This example B
is valid in the following cases: The type of ISDN terminal connected to an ISDN line is not always fixed. For example, the ISDN line may be temporarily rented and communication may be performed using a laptop computer. In such a case, it is more convenient to leave the own attribute information in the other party's table 30 unchanged without updating it. In this case, a setup frame with the table update permission flag set to "0" (update not permitted) will be received.

Embodiment C i) A table deletion request is made in the setup frame, for example, in the "user user" information part, in order to display whether or not the contents of the table 30 regarding the partner ISDN terminal to which the setup frame should be transmitted should be deleted. Set the area for writing flags.

The ISDN terminal that has received the setup frame from the partner ISDN terminal ii) monitors the table deletion request flag written in the received setup frame. iii) As a result of the monitoring, if a request has been made to delete the contents of the table within itself, the deletion is executed, and if no request has been made, the contents of the table are saved as they are.

This embodiment C is effective in the following cases. For example, due to changes in office layout, IS
It may be necessary to relocate the DN terminal. In such a case, the information regarding the ISDN terminal is transferred to other
Since it is no longer necessary for the SDN terminal, it is advantageous to delete it from the table in terms of reducing the size of the table and shortening the table search time. In this case, a setup frame with the table deletion request flag set to "1" (deletion request) will be received.

Embodiment D When an ISDN terminal sets up a call to the other party's ISDN terminal, i) Prior to transmitting a setup frame for call setting to the other party's ISDN terminal, The table 30 is searched using the address information of a certain partner ISDN terminal.

ii) As a result of the search, if the address information is not registered in the table 30, the address information and the attribute information of the other party's ISDN terminal are newly registered as a pair in the table, and if If it is registered, the attribute information already registered in the part corresponding to the address information in the table is rewritten with the attribute information written in the setup frame that is about to be sent, and the table is updated. Perform updates.

Embodiment E i) When an ISDN terminal sets up a call to a partner ISDN terminal, it refers to table update permission display means (25 in FIG. 3) provided within the ISDN terminal. ii) the result of that reference;
The table is updated when it is acceptable to update the contents of the internal table regarding the other party's ISDN terminal. If it should not be updated, the contents of the internal table are kept as they are.

This embodiment E is effective in the following cases. The other party's ISDN terminal does not always have the same attributes. For example, although the other party's ISDN terminal is normally used only as a telephone, it may be known in advance that it will be temporarily used for data communication or facsimile communication. In times like this,
It is more convenient to leave the attribute information regarding the other party in the own table 30 regarding the other party's ISDN terminal without updating it. Therefore, as shown in FIG. 3, table update permission display means 25 is provided. When it is known in advance that the attribute of the other party will be changed only temporarily, "0" (update not possible) is displayed for the other party's ISDN terminal on the display means 25. The processor (28 in FIG. 3) in the source ISDN terminal first monitors the display means 25 when transmitting the setup frame, and if update not possible (“0”) is displayed, the processor (28 in FIG. 3) Leave the contents of the table as is.

Embodiment F i) When an ISDN terminal sets up a call to the other party's ISDN terminal, it refers to table deletion permission display means (26 in FIG. 3) provided within the ISDN terminal. ii) As a result of the reference, if the content of the internal table 30 regarding the partner ISDN terminal can be deleted, the deletion is executed. If it is not to be deleted, the table is updated by rewriting the contents of the table 30 within itself with the attribute information of the other party's ISDN terminal written in the setup frame for call setting.

This embodiment F is effective in the following cases. For example, the other party's ISDN terminal may be relocated due to changes in office layout, etc., and this may be known in advance. In such a case, it is advantageous to delete the contents of the internal table regarding the ISDN terminal related to the transfer in terms of reducing the size of the table and shortening the table search time. Therefore, as shown in FIG. 3, table deletion permission display means 26 is provided. When there is a notification that the other party is relocating, etc., the display means 26 displays "1" (
(can be deleted) is displayed. The processor (28 in FIG. 3) in the source ISDN terminal first monitors the display means 26 before transmitting the setup frame.
When deletion allowed (“1”) is displayed, the contents of the other party are deleted from the contents of the own table.

Embodiment G When an ISDN terminal sets up a call to the other party's ISDN terminal, i) prior to transmitting a setup frame for call setting to the other party's ISDN terminal, the destination ISDN written in the setup frame; ISDN of the other party
The table 30 is searched using the address information of the terminal.

ii) As a result of the search, if the address information is registered in the table, and the attribute information of the other party's ISDN terminal corresponding to the address information and the attribute information written in the setup frame are A setup frame is sent to the other party's ISDN terminal only when the two match. Normally, when making a telephone call, when performing data communication, and when performing facsimile communication, the functional unit (TEL) 2 in Fig. 3 is used.
1. Functional section (DATA) 22 and functional section (FAX) 2
Make a call from step 3.

Embodiment H i) Refer to the search availability display means (27 in FIG. 3) provided in the ISDN terminal. ii) As a result of the reference, if no search is required, the setup frame is transmitted without comparing attribute information. If a search is required, a comparison of attribute information is performed.

This embodiment H is effective in the following cases. When a certain ISDN terminal makes a call to the other party's ISDN terminal, communication is being made to the other party's ISDN terminal for the first time, and therefore it is naturally known that the address information and attribute information regarding the other party's ISDN terminal are not registered in the table 30. There are times when I am. It is wasteful to perform a table search in such a case. vice versa,
When a certain ISDN terminal makes a call to the other party's ISDN terminal, the attribute information of the other party's ISDN terminal may be known accurately without checking. Even in such a case, it is wasteful to perform a table search. Therefore, Figure 3
As shown in FIG. 2, a retrieval availability display means 27 is provided. For such a partner ISDN terminal, "0" (search not possible) is displayed. The processor (28 in FIG. 3) in the source ISDN terminal first monitors the display means 27 when transmitting the setup frame, and when the search failure ("0") is displayed, the processor (28 in FIG. 3) Skip table lookup.

[0032]

As explained above, according to the present invention, it is possible to check whether the setup frame matches the attributes of the other party's ISDN terminal before actually transmitting it to the other party's ISDN terminal.
PLETE" is clearly not returned by the other party's ISD.
There is no need to send setup frames to N terminals in vain. Therefore, the effective utilization rate of the ISDN line is improved.

[0033] Also, since the attributes are automatically updated sequentially by the learning function, "RELEASE COM
PLETE'' is not returned.

[Brief explanation of the drawing]

1 is a diagram showing the basic steps of a connection management method according to the invention; FIG.

FIG. 2 is a diagram showing an overview of an ISDN communication system to which the present invention is applied.

FIG. 3 is a diagram showing a configuration example of an ISDN terminal according to the present invention.

FIG. 4 is a diagram showing an example of a table formed in the storage means 12.

FIG. 5 is a diagram showing the format of a setup frame.

[Explanation of symbols]

10...ISDN communication system 11...ISDN terminal 12...Storage means 13...ISDN network 21...Telephone function section 22...Data communication function section 23...Facsimile function section 24...Console part 25... Table update availability display means 26... Means for displaying whether or not table deletion is possible 27...Searchability display means 28...processor 30...table

Claims (9)

[Claims] Claim 1: ISDN terminals (11) that are interconnected via an ISDN network (13) and each have built-in storage means (12) necessary for mutual communication,
In each of the ISDN terminals (11), the storage means (
12), a table (30) is formed in which address information indicating the address of each partner ISDN terminal (11) is associated with attribute information indicating its attributes, and the attribute information is updated each time the interconnection is performed. A connection management method in an ISDN terminal, characterized in that the above-mentioned mutual communication is performed by automatically rewriting the table (30) having the latest attribute information. [Claim 2] The ISD receives a setup frame for call setting from the other party's ISDN terminal (11).
The N terminal (11) receives the corresponding ISDN terminal (11) written in the received setup frame.
The address information indicating the address information is stored in the table (30
), and as a result of the search, if the address information is not registered in the table (30), the address information and the ISDN terminal (1) are registered in the table (30).
Newly register the attribute information in 1) as a pair, and
If it is registered, the attribute information already registered in the part corresponding to the address information in the table (30) is rewritten with the attribute information written in the setup frame just received. The connection management method according to claim 1, wherein the table (30) is updated. 3. An area for writing a table update permission flag is set in the setup frame to indicate whether or not the table (30) may be updated, and the other party's ISDN terminal (11) ) the ISDN terminal (11) that received the setup frame from
monitors the table update permission flag written in the received setup frame, and if the update of the table (30) is permitted as a result of the monitoring, updates the internal table (30). 3. A connection management method according to claim 2, wherein the update is performed and, if not permitted, the contents of the table (30) are saved as they are. 4. A table deletion request flag is written in the setup frame to indicate whether or not the contents of the table (30) regarding the partner ISDN terminal (11) that should transmit the setup frame should be deleted. The ISDN terminal (11), which has set an area for the setup frame and received the setup frame from the partner ISDN terminal (11), monitors the table deletion request flag written in the received setup frame, and As a result of monitoring, the corresponding table (30) within the company
If there is a request to delete the contents of the table (
3. The connection management method according to claim 2, wherein the contents of step 30) are saved as they are. 5. When the ISDN terminal (11) sets up a call to the other party's ISDN terminal (11), it sends a setup frame for call setting to the other party's ISDN terminal (11).
Prior to sending the call to the terminal (11), the address information of the destination ISDN terminal (11) written in the setup frame is used in the table
30), and as a result of the search, if the address information is not registered in the table (30), the address information and the other party's ISDN are registered in the table (30).
The attribute information of the terminal (11) is newly registered as a pair, and if registered, the attribute information already registered in the part corresponding to the address information in the table (30) is registered. , Rewrite with the attribute information written in the setup frame that is about to be sent,
The connection management method according to claim 1, wherein the table (30) is updated. 6. When the ISDN terminal (11) sets up a call to the other party's ISDN terminal (11), it refers to a table update permission display means (25) provided within the ISDN terminal, and as a result of the reference, The other party's ISDN terminal (11
) when it is acceptable to update the contents of the table (30) within the company, and
If it should not be updated, update the corresponding table (3
6. The connection management method according to claim 5, wherein the contents of 0) are saved as they are. 7. When the ISDN terminal (11) sets up a call to the other party's ISDN terminal (11), it refers to table deletion permission display means (26) provided within itself, and as a result of the reference, The other party's ISDN terminal (11
), delete the contents of the table (30) in your own company when it is acceptable to delete it, and if it is not allowed to delete it, delete the contents of the table (30) in your own company as described above. 6. The connection management method according to claim 5, wherein the table is updated by rewriting with attribute information of the other party's ISDN terminal (11) written in a setup frame for call setting. 8. When the ISDN terminal (11) sets up a call to the other party's ISDN terminal (11),
Prior to transmitting a setup frame for call setting to the other party's ISDN terminal (11), the address information of the other party's ISDN terminal (11), which is the destination, written in the setup frame is used to send the call to the table (3).
0), and as a result of the search, the address information is registered in the table (30), and the attribute information of the other party's ISDN terminal (11) corresponding to the address information and the setup frame are searched. The connection management method according to claim 1, wherein the setup frame is transmitted to the other party's ISDN terminal (11) only when the attribute information written in the attribute information is compared with the attribute information written in the attribute information. 9. A search permission display means (27) provided in the ISDN terminal is referred to, and as a result of the reference, if a search is not required, the setup frame is transmitted without comparing the attribute information. 9. The connection management method according to claim 8, further comprising performing a comparison of the attribute information if a search is required.