JPH0282738A - Selective receiving system for isdn representative group - Google Patents

Abstract

PURPOSE:To prevent receiving impossibility completion by selecting a line to be able to receive the number of calls for each bearer information at the time of the receiving request to an ISDN representative group and selecting a next line when a B channel is wholly busy and receiving cannot be executed after selection. CONSTITUTION:An ISDN network 30 monitors the number of the calls of respective lines in correspondence to the bearer information. When the request of the receiving is executed for the terminal in which the bearer information is a voice for an ISDN representative group, the ISDN network 30 refers to the data of a maximum call number allowable table 24, a maximum allowable call number (m) in a line 10 in which the bearer information is a voice, and the number of the calls at the present time are compared, and when the number of the calls at the present time does not exceed (m), the line 10 is selected. When the B channel in the idle condition is not present at the line 10, the same processing is executed for other line and the line is selected. Thus, it is prevented that the receiving cannot be completed.

Description

[Detailed description of the invention] [Summary] Regarding the ISDN representative group selection call termination method, when a call is received to the ISDN representative group, a terminal device that allows bearer information of the incoming call selects a blocked line and the call is not completed. ISDN is an ISDN that accommodates a representative group of multiple lines, each of which can connect different types of terminals at the same time. In the network, maximum allowable call number storage means for storing the maximum allowable number of calls corresponding to bearer information for each line; connected call number monitoring means for monitoring the number of calls in use for each line corresponding to bearer information; When a call termination request is made, the bearer information of the receiving terminal, the maximum allowable number of calls storage means, and the connected call number monitoring means are referred to, and the line is selected so that the number of calls in use corresponding to the bearer information does not exceed the maximum allowable number of calls. The apparatus is configured to include a line switching means for selecting a line having a vacant B channel from among them and performing incoming call processing.

[Industrial application field]

The present invention relates to an ISDN representative group selection terminating system, and more specifically, when a terminal with acceptable bearer information is occupied even if an empty B channel exists on the terminating line, the I
ISDN that allows you to select other lines in the SDN representative group
Concerning a representative group selection incoming call method.

In this specification, bearer information refers to the attributes of a signal that can be handled by a terminal device, and is based on TAB L E48 of the CCITT recommendation.
“Bearer (pa)” defined in c/Q, 931.
ability information element
t” specifies its specific content.

A plurality of lines (also referred to as user network interfaces) accommodated in the ISDN network are hereinafter referred to as lines.

) constitute the ISDN representative group. When a call arrives at this ISDN representative group, it is desired that the call is received at a terminal device that is connected to any line in the ISDN representative group and is capable of accepting bearer information.

[Prior Art] It is possible to simultaneously connect different types of terminals such as telephones and hook-up devices to one line in the ISDN representative group.
Bearer information is used as the selection control information.

Figure 6 shows conventional ISDN! FIG. 2 is a block diagram illustrating a call receiving method in i1. In the same figure, 2-1 is the ISD
It is one of the N representative groups, and the ISDN representative group 2-1 consists of a plurality of lines 10-1 to 10-n. Each line has
Telephone (TI) 200 and facsimile machine (Fax P)
+) Different types of terminal devices such as 201 can be connected. ISD
N representative group 2-1 is accommodated in the ISDN network 30a.

In the conventional ISDN representative group, when determining whether a call can be received on one line in the ISDN representative group, only the number of vacant B channels is used as a criterion. For this reason, there is no problem when all terminals connected to one line allow the same bearer information, but a problem occurs when terminal devices using different bearer information are connected.

That is, as shown in FIG. 6, on one line 10-1 constituting the representative group, there is a telephone (TI) 200 whose bearer information is voice (Speech), and a telephone (TI) 200 whose bearer information is 3. lK
A facsimile machine (Fax P+) 201 which is Hz audio is connected, and the maximum number of usable channels on this line is two. It is assumed that a telephone call arrives on the line 10-1 when only the telephone (T,) 200 is in use and the facsimile machine (Fax P+) 201 is idle. In this case, since there is one free B channel, the ISDN network 30a determines that the line 10-1 is a line that can receive calls. However, when the ISDN network 30a selects this line 10-1, the telephone (T, ) that can accept the bearer information (Speech) of the telephone ('r+)2oo, which is the incoming call, is selected.
200 is busy, the call is incomplete and IS
Even though the DN network 30a determines that the call can be received, the call is not actually received.

There was a problem in that it was sometimes impossible to receive calls because the terminal was blocked.

The purpose of the present invention is to manage the number of calls for each bearer information for each line constituting an ISDN representative group in an ISDN network, and when a call is requested to the ISDN representative group, the number of calls that can be received is determined based on the number of calls for each bearer information. Based on the idea that if a line is selected and an attempt is made to receive a call, but the call cannot be received because all B channels are blocked, the next line is selected. To prevent call reception from being incomplete due to a terminal device that allows information selecting a blocked line, and to promptly allow a terminal device of another line that allows bearer information to receive a call.

[Problem to be solved by the invention]

As explained above, in the past, it was determined whether the call could be received only by the B channel being blocked, so even if the ISDNfl determined that the call could be received and selected a line, it actually did not check the bearer information of the incoming call. Acceptable Terminal Device [Means for Solving the Problem] FIG. 1 is a block diagram of the principle of the present invention. In the figure, -1 to 1-n are lines constituting representative group 2, 3 is an ISDN network, 4 is maximum allowable call number storage means, 5 is connected call number monitoring means, and 6 is line switching means.

Each of the lines 1-1 to 1-n can simultaneously connect different types of terminals with different allowable bearer information.

The maximum allowable call number storage means 4 stores the maximum allowable call number corresponding to the bearer information for each of the lines 1-1 to 1-n. The connected call number monitoring means 5 corresponds to bearer information for each line.
Monitor the number of calls in use.

When a call termination request is made, the line switching means 6 refers to the bearer information of the terminating terminal, the maximum allowable number of calls storage means 4, and the number of connected calls monitoring means 5, and determines the number of calls in use corresponding to the bearer information of the incoming call. A line with an empty B channel is selected from among the lines whose number does not exceed the maximum allowable number of calls, and incoming call processing is performed.

[For production]

In the present invention, the number of calls is managed for each bearer information for each line constituting the SDN representative group, and the number of calls that can be received for each bearer information is Select the appropriate line. Also, if you try to receive a call by selecting one, but cannot receive the call because all B channels are occupied, another line is selected.

When a call termination request is made, the bearer information of the terminating terminal, the maximum allowable call number storage means 4, and the connected call number monitoring means 5 are referred to, and the number of in-use calls corresponding to the bearer information of the incoming call is the maximum allowable number of calls. Since a line with an empty B channel is selected from among lines that do not exceed , the connection will not be incomplete as would occur if a connection was attempted by simply monitoring only an empty B channel.

〔Example〕

FIG. 2 is a system configuration diagram of an ISDN network according to an embodiment of the present invention. In the figure, 2o-1 to 20-n are terminal devices (7B), 21 is a network termination device (N-th), and 2-1 to 2-2 are terminal devices (7B);
-s is a representative group, and 22-1 to 22-+a are subscriber termination line collection bags! (LC), 23 is a central control unit, 24 is a maximum allowable number of calls table for each bearer information, 25 is a common line signal control unit (C3E), 30 is an ISDN network, and 60 is a network.

To briefly explain the operation of the system shown in FIG. 2, when a calling terminal issues a call termination request to a terminal that uses speech bearer information, for example, the network 60 communicates with the central controller 23 and common line signal control. Device (C3H) 25
select one of the subscriber termination concentrators (LC) 22-1 to 22-n under the control of
Furthermore, one line is selected from among the representative group accommodated in the selected subscriber terminating line concentrator (LC), and a call is received at a terminal connected to that line. In this case, the central controller 23 uses the maximum allowable number of calls table (*1) 24 and the subscriber terminal concentrator (LC) 22 in the central controller 23.
-1 to 22. The network 60 is controlled to select an appropriate line by referring to the number of calls in use monitoring section *2 in n.

Figure 3 is the maximum allowable number of calls table (*1) shown in Figure 2.
It is a figure which shows Example 24. In this figure, the same parts as in FIG. 2 are given the same reference numerals.

In one &jlIO constituting representative group 2-1, telephones 200-1 to 200-1 whose bearer information is voice (Speech)
200-i and facsimile machines 201-1 to 201-1 whose bearer information is 3.1 KH2 audio.
201-j is connected. As shown in the maximum allowable call number table (*1) 24, the number of calls allowed for each bearer information is up to Speech = m.

3.1 KHz Audio = n
shall be. However, m and n must be less than or equal to the number of terminals in the corresponding bearer information (m: 5i, n5j), and the number of B channels of the relevant line (2 for basic access interface, PCM
30 or 31 for a primary group interface of 30, etc.
c,) is the maximum. The rsDN network 530 monitors the number of calls on the line based on bearer information. Of the representative group,
When an incoming call is requested for a terminal whose bearer information is voice (Speech), ISDNf130 refers to the data in the maximum number of calls allowed table (*1) 24 and determines that the bearer information is voice (Speech). , the maximum allowable number of calls m on line 10 and the current number of calls (number of calls in use)
If the current number of calls does not exceed m, line l
Select O. However, if there is no free B channel on the line 10, the same process is performed on other lines to select the line.

FIG. 4 is a block diagram showing FIG. 3 in more detail. In FIG. 4, representative group 2-1 includes a plurality of lines 10-1.1.
0-2. . . , and telephones 200-1 to 2001 and facsimile machines 201-1 to 201-j are connected to the line 10-1 in the same way as shown in FIG.

Telephones 202-1 to 202-k are connected to line 10-2. The ISDN network 30 has tables 24-1, 24-2, . . . that store the maximum allowable number of calls and the current number of calls in the bearer information for each line and for each bearer information.
・Equipped with

FIG. 5 is a flowchart illustrating the incoming call operation of ISDN 1130 in the system of FIG. In FIGS. 4 and 5, when a call setup request is made to the ISDN representative group in step S1, the originating terminal or
The bearer information of the receiving terminal formed in the SDN network is read out, and in step S3, the value X indicating the line number is set to 0.Then, in step S4, the line with number X (interface) is set to 0.
A call number management table corresponding to the information and the bearer information, for example, 2
4-1, and in step S5, bearer information that matches the read bearer information is detected in the table.

Next, in step S6, it is determined whether the maximum allowable number of calls corresponding to the bearer information is 0, and if it is not 0, step S7
The number of busy calls using the bearer information in line X (the current number of calls) and the maximum allowable number of calls that can use the bearer information in line
-1 etc. and compare. As a result of this comparison, if the current number of calls is less than the maximum allowable number of calls, it is determined that the call can be accepted, and the process advances to step S8 to perform a B channel hunt operation. As a result of this hunt operation, if it is not possible to hunt for a free B channel because all B channels of circuit IX are occupied, X is incremented in step SIO, and another circuit in the same representative group is searched for in step 84.
~ Performs the same operation as S7. When the B channel is hunted in step S9, 1 is subtracted from the current number of calls in step Sll, and the process ends.

When the current number of calls exceeds the maximum allowable number of calls in step S7, X is compared with the total number of lines in the representative group in step S12, and if X is less than the total number of lines, in step SIO
is incremented, the process returns to step S4, and the same operations as steps 84 to S7 described above are performed for another line within the same representative group. If X becomes greater than or equal to the total number of lines in step S12, the call setting request is rejected in step S13, and the process is terminated.

For a given line, the maximum allowable number of calls corresponding to the bearer information indicated at the time of the call setup request is compared with the current number of calls, and if the call is not ready to accept, another line within the same representative group is investigated. If it is determined that the call can be accepted, but the B channel cannot be hunted because all B channels of the line are occupied, another line within the same representative group is checked. If all interfaces in the representative group are checked and no interface capable of receiving calls is found, the call setup request is rejected.

In the configuration shown in Figure 4, when the representative group 2-1 receives bearer information = voice (Speech), the IS
When searching line 10-1 with DNm30, bearer information =
Since the maximum allowable number of speech calls q is equal to the current number of calls q, this line 10-1 is not selected and the bearer information of the next line 10-2 = the maximum allowable number of speech calls p is Since the current number of calls is greater than S, line 10-
2 is selected, and if the terminal connected to that line has a free B channel, the incoming call is processed for that terminal. [Effects of the Invention] As explained above, according to the present invention, in ISDNm, the ISDN representative The number of calls is managed for each bearer information for each line that makes up the group, and when a call is requested to the ISDN representative group, a line that can receive the call is selected based on the number of calls for each bearer information, and the selected line is selected and attempted to receive the call. However, if a call cannot be received because all B channels are blocked, the next line is selected, so that when a call is received to the 15ON representative group, the terminal device that accepts the bearer information of the incoming call will select the line that is blocked. By selecting , it is possible to prevent call termination from being incomplete and to promptly have the call arrive at a terminal device on another line that accepts the bearer information.

[Brief explanation of the drawing]

Fig. 1 is a principle block diagram of the present invention, Fig. 2 is a system configuration diagram of ISDNM4 according to an embodiment of the present invention, Fig. 3 is an explanatory diagram of the maximum allowable number of calls table according to an embodiment of the present invention, and Fig. 4 is Figure 3 is a more detailed block diagram, Figure 5 is the 4th block diagram.
FIG. 6 is a flowchart explaining the call receiving operation in the system shown in the figure. FIG. 6 is a block diagram explaining the conventional call receiving method. In the figure, 1-1.1-2. ,,,． 1-n, 10.10-1
．． 10-2...Line (user network interface), 2.2-)~2-1m...Representative group, 3...ISDNli, 4...Maximum allowable number storage means, 5...Connection Call number monitoring means, 20-1 to 20-n...terminal equipment (TE), 21...
・Network termination equipment (NT), 22-1 to 22-a+...Subscriber termination line concentrator (LC)
), 23...Central control unit (CC) 2424...
Maximum allowable number of calls table (*l), 25...Common line signal control equipment (C5E) 25.30...ISDN network, 60...Network.

Claims (1)

[Claims] 1. In an ISDN network (3) that accommodates a representative group (2) consisting of a plurality of lines (1-1, 1-2, ..., 1-n), each of which can connect different types of terminals at the same time. , maximum allowable call number storage means (4) for storing the maximum allowable number of calls corresponding to the bearer information for each of the lines, and connected call number monitoring for monitoring the number of calls in use for each of the lines corresponding to the bearer information. Means (5), when a call termination request is made, refers to the bearer information of the called terminal, the maximum allowable call number storage means (4), and the connected call number monitoring means (5), and responds to the bearer information. ISDN characterized in that it is equipped with a line switching means (6) that selects a line with a free B channel from among the lines where the number of calls in use does not exceed the maximum allowable number of calls and performs incoming call processing.
Representative group selection incoming call method.