JPH04216252A - Call terminating method and communication terminal for digital network - Google Patents

Abstract

PURPOSE:To identify incoming calls to the own group and the other group by using a specified termination designation code and to unnecessitate the change of an already subscribed terminal even when the group terminal is newly subscribed. CONSTITUTION:A group Gn containing plural terminals TE has a group identification value In, and these group identification values In are set so as to be primes to terminal designation identification values X1-X6 of respective terminals in the own group one and another. On the call originating side, a function Y is generated by Y=XiXIn while using the terminal designation identification value Xi of the desired terminal to terminate the call and the group identification value In of the call originating side group Gn and transmitted as the termination designation code. On the call terminating side, according to whether the received termination designation code can be divided by the group identification value In of the own group Gn or not, it is identified whether the incoming call comes from the inside of the own group or not. When the incoming call comes from the outside of the own group, the termination is refused.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a method for receiving calls in a digital network such as ISDN (Integrated Services Digital Network), and in particular, to a method for determining whether an incoming call is from within the same group or from outside the group. The present invention relates to a method for receiving calls on a digital network that makes it possible to restrict incoming calls. For example, in ISDN terminal communication, even if the terminals are at the same level, the present invention is applicable to communication terminals that want to allow line connection only for calls made from within each company, especially television (TV) conference terminals and TV conference multipoint control devices. It is useful when applied to a terminal adapter, etc. when connecting an ISDN line, or a line interface part.

0010

[Prior Art] Conventionally, in digital networks such as ISDN, an ISDN address is used to specify a terminal to which a call is to be received.
For example, subaddresses are used to designate one of a plurality of terminals accommodated in a terminal adapter to receive a call. In such digital networks, each company may form a terminal group and wish to restrict incoming calls from outside the group. For example, in a system that conducts a TV multipoint conference between multiple TV conference devices within a group, the TV conference devices installed at each location are
A line is connected to a TV conference multipoint control device installed at another point via an N line, and a TV multipoint conference is realized via an ISDN line under the control of this TV conference multipoint control device. However, when communicating through a public line such as ISDN, any connection is possible as long as consistency at the terminal level (layer consistency in the case of ISDN) is achieved. For this reason, in the TV multipoint conference system described above, even if the TV conference equipment is from another company that does not belong to the company's group,
It is possible to make a line connection to the TV conference multipoint control device of your own group, and it is possible to conduct a TV multipoint conference using that TV conference multipoint conference control device without permission.

[0011] For this reason, it is necessary to restrict access from other companies' TV conference equipment to the TV conference multipoint equipment of your own group. When a call is received, you can register the sub-address and check this to identify whether the call is from within your company's group or from outside your company's group.
This restricts incoming calls.

[0020]

[Problem to be Solved by the Invention] However, if incoming calls are restricted using the conventional method, when a new terminal joins a group, all terminals that have already joined the group will have to receive the ISDN number, subaddress, etc. of the newly joined terminal. Registration is required, which is undesirable because it requires a huge amount of work if there are a large number of terminals joining the group.

[0021] The present invention has been made in view of the above circumstances, and it is an object of the present invention to enable multiple terminals to be connected to one's own group without having to change existing terminals even when a new terminal joins a group. It is an object of the present invention to provide a method for receiving a call and a communication terminal that can identify a group's incoming calls.

[0030]

[Means for Solving the Problems] FIG. 1 is a diagram illustrating the principle of the present invention. The present invention provides a method for receiving calls in a digital network including a plurality of grouped terminals TE, in which the group Gm has a group identification value Im, and this group identification value Im is a terminal of each terminal in its own group. These functions Y(Xi, In ) is generated and this function Y is specified by the destination specification code SAR=Y(Xi,
In), and the receiving side analyzes the received call specification code SAR using the group identification value of its own group to identify whether the incoming call is from within its own group or not. A method for terminating a digital network is provided.

Further, in the present invention, in the above-mentioned call receiving method, the calling side generates the function Y by Y=Xi ×In and transmits it as the calling specification code SAR, and the receiving side uses the received calling specification code as its own group. A method for receiving a call in a digital network is provided in which it is determined whether the call is from within the own group or not based on whether the call can be divided by the group identification value Im of Gm. Further, in the present invention, in the above-mentioned call receiving method, the digital network includes a plurality of groups G1, G2, . . . , and the group identification values I1, I2, . A network termination method is provided. Further, in the present invention, in the above-mentioned call receiving method,
A method for receiving calls in a digital network is provided that identifies incoming calls from within one's own group and restricts incoming calls so that calls from outside one's own group are rejected.

Furthermore, in the present invention, in the above-mentioned call receiving method, when receiving calls are not restricted, the receiving side sets the group identification value Im of its own group Gm to 1, thereby distinguishing between call receiving restrictions and non-receiving restrictions. A digital network receiving method that can be used selectively is provided. The destination specification code may be a destination subaddress in ISDN. Further, the present invention provides a communication terminal having a function of performing the methods of each of the above embodiments.

[0040]

[Operation] On the calling side, the terminal specification identification value Xi of the terminal to receive the call and the group identification value In of the calling side group Gn
A function Y(Xi, In) is generated from the function Y(Xi, In) and transmitted as the destination designation code SAR. The receiving side analyzes the received call specification code SAR using the group identification value of its own group to identify whether the incoming call is from within its own group. Function Y of this arrival designation code SAR
can be the multiplication value of the terminal designation identification value Xi and the group identification value In, and the receiving side uses the reception designation code SAR
It is checked whether or not it can be evenly divided by the group identification value Im of the own group Gm, and if it can be divided, it can be determined that the incoming call is from within the own group, and if not, it can be determined that it is from outside the own group. In addition, when it is determined that the call is from outside the own group, the incoming call can be restricted so that the incoming call is rejected.Also, when the incoming call is not restricted, on the receiving side, the group identification value Im of the own group Gm
By setting 1 to 1, it is possible to selectively use incoming call restriction and incoming call non-restriction.

[0050]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. An embodiment of the invention is shown in FIG. This embodiment concerns an in-house TV conference system that conducts TV multipoint conferences using ISDN. In FIG. 2, 11
~14 are ISDN terminal adapters, which are installed at different locations ■~■. Among these, terminal adapters 11 to 13 belong to the group of company A, and terminal adapter 14 belongs to the group of company B. Each terminal adapter 11
~14 can be connected to each other via ISDN lines. Each terminal adapter 11-14 has three ports #1-#3 of H0 rate interface. Here, the terminal adapter 11 has three TV conference terminals 111.
~113 are connected, and the terminal adapter 12 has three T
The V conference terminals 121 to 113 are connected, and the terminal adapter 1
3 has three channels c of the TV conference multipoint control device 3.
h1 to ch3 are connected, and three TV conference terminals 141 to 143 are connected to the terminal adapter 14. The TV conference multipoint control device 3 has three channels and performs control so that a TV multipoint conference can be held between three TV conference terminals connected to these channels via a terminal adapter 13.

[0051] All terminal adapters 1i (i=1 to 4)
A natural number Xj (j=1 to 3) is assigned to each of the three ports as an incoming port designation value. For each terminal adapter, if the port number is the same,
The incoming port designation value Xj is also the same. Each TV conference terminal connected to these terminal adapters 1i and each channel of the TV conference multipoint control device 3 uses the incoming port designation value of the connected port as the incoming terminal designation value. Also, each group has a different group identification value Im.
(However, m=a or b) is assigned. This group identification value Im is selected to be a value that is relatively prime to the incoming port designation value Xj of each port of the terminal adapter, and a value that is relatively prime to the group identification values Im of other groups. In this example, the group identification value Ia of company A's group is "11", and the group identification value Ia of company B's group is "11".
b is selected as "13". In this system, when making a call, the destination ISDN number and destination port designation value Xj
When dialing is specified, the terminal adapter with the group identification value Im sends the destination subaddress SAR
=Xj ×Im, and a call is made using the destination ISDN number + destination subaddress SAR.

FIG. 3 shows an example of the configuration of each terminal adapter 11 to 14. This terminal adapter is INS1500
It has a configuration with a 3-port interface on the H0 channel, and in the figure, 11 to 16 are 1.544 Mbps
/384 kbps speed conversion buffer, 17 is I
It has SDN layer 1 function and has D channel, B channel (6
18 is a demultiplexer that has an ISDN layer 1 function and separates the D channel and B channel; 19 is an LAPD circuit that performs D channel synchronization processing and has a layer 2 function; Reference numeral 10 denotes a CPU that executes a call/call protocol and has a layer 3 function and a call/call information processing function.

The operation of this embodiment system will be explained below. Since the ISDN terminating subaddress is transparent between terminals, there is no problem even if additional information is superimposed on the original terminating subaddress (that is, the value designated by the terminating terminal). Therefore, when the calling side wants a terminal Gij to receive a call within its own group, it sets the group identification value Im of its own group (of all terminals in that group) to the incoming port designation value Xj of the terminal adapter to which that terminal Gij is connected. The value obtained by multiplying the terminating terminal specified value X by
As an AR, make a call along with an ISDN number. That is,
Transmission is performed as SAR=Xj×Im.

[0054] The terminal adapter on the receiving side uses the group identification value Im of its own group as the group analysis identification value *Im.
Then, the received destination subaddress SAR is divided by this group analysis identification value *Im. As a result of this division, if the destination subaddress SAR can be divided neatly, that is, (SAR
)mod(Im)=0, it can be determined that the incoming call is from within the own group. If the incoming call is from another group, since the group identification values Im of each group are relatively prime, a remainder will be generated as a result of division, and this can be immediately determined. In this way, it is possible to determine whether the call is within the group or outside the group, and permit/reject incoming calls as necessary. Also, if it is within a group, the quotient of the division is the terminal G that you want to receive the call from.
Since the designated value of the receiving terminal of ij is Xj, the call can be received at that terminal.

In the embodiment shown in FIG. 2, it is necessary to limit incoming calls to the TV conference multipoint control device 3 to those from the TV conference terminals 211 to 213 and 221 to 223 within the group to which company A belongs. In this case, the TV of company A's group
When a conference terminal requests connection to the TV conference multipoint control device 3, the terminal adapter accommodating the TV conference terminal sets the group identification of its own group to the receiving terminal specified value Xj of the TV conference multipoint control device 3 when making a call. Value Ia = “
11" to generate the destination subaddress SAR, and
A call is made to the V-conference multipoint control device 3. in this case,
Terminal adapter 13 that accommodates the TV conference multipoint control device 3
can divide this called subaddress SAR by the group identification value Ia = "11" of its own group, and determines that the incoming call is from its own group, so it accepts the incoming call.

On the other hand, when a call is made from the group of company B, the terminal adapter 14 multiplies the incoming terminal designation value X by the group identification value Ib = "13" and determines the incoming subaddress SA.
Since R (=X×13) is generated and transmitted, A
The terminal adapter 13 of the company group sets its destination subaddress SAR to the group identification value Ia = "11" of its own group.
", and therefore it can be determined that the incoming call is from another group, and the incoming call is rejected. Note that since there is no particular problem in communicating between the TV conference terminals of Company A and Company B, each terminal adapter 11 , 12 , 14 except for terminal adapter 13 uses the group analysis identification value *Im when receiving a call. is set to *Im = 1 to determine whether to permit or disallow incoming calls. In this case, all incoming calls are permitted if the called subaddress is a natural number.

[0057] In this way, normally the terminal adapters 11, 1
2 and 14 are in an unrestricted mode in which calls can be received even from other companies' groups, and the terminal adapter 13 is in a restricted mode in which only calls from within the own group are allowed. 12, 1
4. If you want to reject calls from outside your group,
For incoming calls, the group analysis identification value *Im is set to the group identification value Im of the own group, and the called subaddress S
All you have to do is divide AR. Further, if it is desired to cancel the incoming call restriction on the receiving side terminal adapter 13 of the company A group, the group analysis identification value *Im is set to *Im = 1 on the receiving side terminal adapter 13 as described above. As a result, all incoming calls are permitted, so even incoming calls from other groups can be connected to the TV conference multipoint control device 3.

[0060]

As described above, according to the present invention, incoming calls from one's own group and those from multiple groups can be distinguished, and the incoming calls can be permitted or rejected as necessary. Also, when a new device joins the group,
Correspondingly, there is no need to change existing subscriber terminals.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a block diagram showing an embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration example of a terminal adapter in the embodiment.

[Explanation of symbols]

11-14: Terminal adapter 2ij: TV conference terminal 3: TV conference multipoint control device 11-16: Speed conversion buffer 17: Multiplexer 18: Demultiplexer 19: LAPD circuit 10: Central processing unit (CPU)

Claims (7)

[Claims] Claim 1: A call termination method in a digital network including a plurality of grouped terminals, the method comprising:
m) has a group identification value (Im), and this group identification value is the terminal specified identification value (Im) of each terminal in its own group.
X1 to Xn) is set to be relatively prime to
) and the group identification value (In
) to generate these functions Y (Xi, In) and send this function Y as a destination specification code (SAR),
A digital network receiving method in which the receiving side analyzes the received call assignment code (SAR) using the group identification value of its own group to identify whether or not the incoming call is from within its own group. . [Claim 2] The calling side transmits the function Y of the destination designation code as a multiplication function of the terminal designation identification value Xi and the group identification value In, that is, Y=Xi ×In, and the receiving side transmits the function Y of the reception designation code as SAR to own group (Gm
2. The method for receiving a call in a digital network according to claim 1, wherein whether or not the received call is from within the own group is determined based on whether or not the call can be divided by the group identification value (Im). Claim 3: The digital network is connected to a plurality of groups (G
3. The digital network receiving method according to claim 1, wherein the group identification values (I1, I2, . . . ) of each group are set to be disjoint. 4. A method for receiving calls in a digital network, in which calls from within the own group are identified by the method for receiving calls according to any one of claims 1 to 3, and incoming calls from outside the own group are restricted so as to be rejected. [Claim 5] When incoming calls are not restricted, the receiving side uses the group identification value (*Im) of its own group (Gm).
5. The method for restricting incoming calls in a digital network according to any one of claims 1 to 4, wherein by setting 1 to 1, it is possible to selectively use incoming call restriction and incoming call non-restriction. 6. Claims 1 to 5, wherein the destination designation code is a destination subaddress in an integrated services digital network ISDN.
A method for restricting incoming calls on a digital network as described in any of the above. 7. A communication terminal having a function of performing the call receiving method according to any one of claims 1 to 6.