JPH0514957A - Telephone system - Google Patents

Telephone system

Info

Publication number
JPH0514957A
JPH0514957A JP19123091A JP19123091A JPH0514957A JP H0514957 A JPH0514957 A JP H0514957A JP 19123091 A JP19123091 A JP 19123091A JP 19123091 A JP19123091 A JP 19123091A JP H0514957 A JPH0514957 A JP H0514957A
Authority
JP
Japan
Prior art keywords
network
line
message
call
call processing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP19123091A
Other languages
Japanese (ja)
Inventor
Motohiro Nakano
元裕 中野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP19123091A priority Critical patent/JPH0514957A/en
Publication of JPH0514957A publication Critical patent/JPH0514957A/en
Withdrawn legal-status Critical Current

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  • Exchange Systems With Centralized Control (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To increase the probability of being connectable with an opposite terminal by performing a transmission to an arbitrary incoming terminal capable of selecting plural network routes and selecting another route when the transmission is disconnected in the process of the network. CONSTITUTION:This system is connected with a line of a common line signal system. When a disconnection signal is returned by performing a transmission from this line, whether a retransmission is performed or not is decided by retrieving a memory table 3 capable of detecting whether the connection can be performed by a reselection of a route from the contents of the disconnection signal or not.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、ディジタル構内交換機
(以下、PBXという。)等のように、複数の網への発
信または中継を行う電話システムに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone system, such as a digital private branch exchange (hereinafter referred to as PBX), for transmitting or relaying to a plurality of networks.

【0002】[0002]

【従来の技術】従来のPBXにおいては、公衆網、専用
線網等の複数の網に接続されたものが知られている。こ
のようなPBXでは、発信者の指示通りに(例えば、ダ
イヤルデータ通りに)網選択を行っていた。このような
PBXによると、指示に係る網への経路が塞がっている
等のときには、呼処理を継続できずに切断となり、発信
をやりなおす機会が多くなるという問題点があった。
2. Description of the Related Art Conventional PBXs are known that are connected to a plurality of networks such as a public network and a leased line network. In such a PBX, network selection is performed according to a caller's instruction (for example, according to dial data). According to such a PBX, there is a problem that when the route to the network related to the instruction is blocked, the call processing cannot be continued and the call is disconnected, and the number of occasions for making a call again increases.

【0003】[0003]

【発明が解決しようとする課題】そこで、発信者の指示
に係る網への経路が塞がっている等の場合には、自動的
に他の網への経路を選択するPBXが考えられている。
かかるPBXによると、一般的には発信をやり直す機会
が減少する利点がある。しかし、近年においては、端末
の種類が種々雑多なものとなり、音声のみならずデータ
が送信されるようになっている。かかる種々雑多な端末
を用いた発信に対し、上記のPBXのように単純に自動
ルート迂回を行うと、相手端末が応答するが回線の特性
が発信者の意図したものでない場合が生じ、無駄な回線
接続がなされたり、または、途中で切断が生じ無要の処
理を行う結果となったりした。
Therefore, there is a PBX that automatically selects a route to another network when the route to the network according to the caller's instruction is blocked.
According to such a PBX, generally, there is an advantage that the chance of making a call again is reduced. However, in recent years, the types of terminals have become miscellaneous, and not only voice but also data is being transmitted. When a call is sent using such various terminals, if the automatic route detour is simply performed as in the above PBX, the partner terminal may respond but the line characteristics may not be what the caller intended, which is wasteful. A line connection was made, or a disconnection occurred on the way, resulting in unnecessary processing.

【0004】本発明はこのような従来の電話システムの
問題点に鑑みなされたもので、その目的は無要な呼処理
が継続されることがなく、従来よりも相手端末に接続さ
れ易くなる電話システムを提供することである。
The present invention has been made in view of the above problems of the conventional telephone system, and the purpose thereof is a telephone in which unnecessary call processing is not continued and which is easier to be connected to a partner terminal than the conventional one. It is to provide a system.

【0005】[0005]

【課題を解決するための手段】本発明では、複数の網に
接続され、この網の少なくとも一つとの接続に使用され
ている回線が共通線信号方式となっている電話システム
に、前記回線から返送される切断メッセージに含まれる
原因データ対応に方路の再選択により呼処理を継続でき
るか否かのデータが記憶されたメモリテーブルと、前記
複数の網との間で制御データの送受を行う網制御手段
と、与えられる呼処理要求に応じて前記網制御手段を制
御して呼設定メッセージを所要網に対し送出させ、切断
メッセージが返送された場合には当該メッセージに含ま
れる原因データに基づき前記メモリテーブルを検索して
呼処理を継続できるか否か判定し、判定結果に基づき前
記網制御手段を制御する呼処理制御手段とを備えさせて
電話システムを構成した。
SUMMARY OF THE INVENTION According to the present invention, a telephone system connected to a plurality of networks, wherein a line used for connection with at least one of the networks is a common line signaling system, is provided from the line. Control data is sent and received between a memory table storing data as to whether or not call processing can be continued by reselecting a route in response to the cause data included in the returned disconnection message, and the plurality of networks. The network control means and the network control means are controlled in response to a given call processing request to send a call setup message to the required network, and when a disconnection message is returned, based on the cause data included in the message. A telephone system is configured by including a call processing control unit that searches the memory table to determine whether call processing can be continued, and controls the network control unit based on the determination result. It was.

【0006】[0006]

【作用】上記構成によると、原因データに基づいてメモ
リテーブルを検索することで方路の再選択により呼処理
を継続できるか否かが検出され、網制御が的確に行われ
ることになる。
According to the above construction, by searching the memory table based on the cause data, it is detected whether or not the call processing can be continued by reselecting the route, and the network control is accurately performed.

【0007】[0007]

【実施例】以下、図面を参照して本発明の一実施例を説
明する。図1は本発明の一実施例に係る電話システムの
ブロック図である。電話システム1には呼処理制御手段
2、メモリテーブル3、網制御手段4が備えられてい
る。網制御手段4には第1網5及び第2網6が回線を介
して接続されている。第1網5及び第2網6は第3網7
に接続され、第3網7には着側の端末8が接続されてい
る。呼処理制御手段2は回線9を介して発側の端末から
直接にまたは、PBXを介して呼設定メッセージを受け
取り、この呼設定メッセージに基づき網制御手段4を制
御し、対応する例えば第1網5へ発呼を行う。第1網5
との間の回線は共通線信号方式であり、呼設定メッセー
ジが制御チャネルを介して送られる。第1網5は呼設定
メッセージの内容を分析し、着側の端末8へ到る回線の
特性が呼設定メッセージに示された回線特性を充足する
か検出する。ここでは充足しないものとして説明を続け
る。すると、第1網5は切断メッセージを電話システム
1へ返送する。切断メッセージには切断の原因データが
「伝達能力不許可」、「輻輳」、「ビジィー」、…など
のように示される。この切断メッセージは呼処理制御手
段2に与えられる。呼処理制御手段2は切断メッセージ
に含まれている原因データに基づきメモリテーブル3を
検索して別の網を選択して再発信可能か(図の「再」で
示される)、または否か(「不」で示される)を検出す
る。再発信可能であれば網制御手段4を制御して第2網
6に対して発信を行わせ、再発信不可能であれば原因デ
ータを含めた切断メッセージを発側端末または中継のP
BXへ返送する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a telephone system according to an embodiment of the present invention. The telephone system 1 is provided with a call processing control unit 2, a memory table 3, and a network control unit 4. A first network 5 and a second network 6 are connected to the network control means 4 via lines. The first network 5 and the second network 6 are the third network 7
The destination terminal 8 is connected to the third network 7. The call processing control means 2 receives a call setup message directly from the calling terminal via the line 9 or via the PBX, controls the network control means 4 based on this call setup message, and responds to the corresponding first network, for example. Make a call to 5. First net 5
The line between and is common line signaling and call setup messages are sent over the control channel. The first network 5 analyzes the contents of the call setup message and detects whether the characteristics of the line to the destination terminal 8 satisfy the line characteristics shown in the call setup message. Here, the explanation will be continued assuming that it is not satisfied. Then, the first network 5 returns a disconnection message to the telephone system 1. In the disconnection message, the cause data of the disconnection is shown as "transmission capability not permitted", "congestion", "busy", ... This disconnection message is given to the call processing control means 2. The call processing control means 2 searches the memory table 3 based on the cause data included in the disconnection message, selects another network, and can re-send the call (indicated by "re" in the figure), or not ( (Indicated by "not"). If redialing is possible, the network control means 4 is controlled to make an outgoing call to the second network 6, and if redialing is not possible, a disconnection message including cause data is sent to the originating terminal or the relay P.
Return to BX.

【0008】以上のシステムは、例えば図2に示される
交換機A〜Dから成るシステムで実現される。同図の交
換機Aが電話システム1に相当し、交換機Bが第1網5
に相当し、交換機Cが第2網6に相当し、交換機Dが第
3網7に相当する。回線11〜14は全てISDN回線であ
り、回線12の伝達能力が非制限ディジタル不可であり、
回線11,13,14の伝達能力が非制限ディジタル可となっ
ている。交換機Aには発側の端末15が接続され、交換機
Dには着側の端末16が接続されている。
The above system is realized by a system including exchanges A to D shown in FIG. 2, for example. The exchange A in the figure corresponds to the telephone system 1, and the exchange B is the first network 5
The exchange C corresponds to the second network 6, and the exchange D corresponds to the third network 7. The lines 11 to 14 are all ISDN lines, and the transmission capacity of the line 12 is not limited to digital,
The transmission capacity of lines 11, 13, and 14 is digital without restriction. A terminal 15 on the calling side is connected to the exchange A, and a terminal 16 on the receiving side is connected to the exchange D.

【0009】交換機Aの詳細構成を図3に示す。内線回
路31-1〜31-nには、内線電話機等の内線端末32-1〜32-n
が接続されている。外線回路33には回線11が接続され、
外線回路34には回線13が接続されている。内線回路31-1
〜31-n相互間、または、外線回路33,34相互間、内線回
路31-1〜31-nと外線回路33,34との間は中央制御部36の
制御下においてスイッチ回路35により通話路が形成され
る。中央制御部36はプロセッサ、主メモリ及びインタフ
ェースを含むコンピュータにより構成され、主メモリに
格納されているプログラム及びデータに基づき各部を制
御する。中央制御部36の主メモリには図4に示されるフ
ローチャートのプログラムが備えられており、外線への
発信のときに当該プログラムに基づく動作が行われる。
The detailed structure of the exchange A is shown in FIG. Extension circuits 31-1 to 31-n include extension terminals 32-1 to 32-n such as extension telephones.
Are connected. The line 11 is connected to the outside line circuit 33,
The line 13 is connected to the outside line circuit 34. Extension circuit 31-1
31-n, or between the external line circuits 33 and 34, and between the internal line circuits 31-1 to 31-n and the external line circuits 33 and 34, the communication path is controlled by the switch circuit 35 under the control of the central control unit 36. Is formed. The central control unit 36 is composed of a computer including a processor, a main memory and an interface, and controls each unit based on a program and data stored in the main memory. The main memory of the central control unit 36 is provided with the program of the flowchart shown in FIG. 4, and when transmitting to an outside line, the operation based on the program is performed.

【0010】端末15から端末16を宛先とし、伝達能力が
「非制限ディジタル」で発呼がなされたとする。すると
交換機Aの中央制御部36は呼処理制御手段2として選択
できる方路の有無を検出し(401) 、方路が有するため回
線11を介して呼設定メッセージを送出する(402) 。する
と、交換機Bは回線12へ中継しようとするが、回線12の
伝達能力が「非制限ディジタル不可」であるため、交換
機Aへ切断メッセージである解放完了を返送する。解放
完了には切断理由として伝達能力不許可と当該信号源が
中継交換機であることを示すデータとが含まれて返送さ
れる。そこで、交換機Aの中央制御部36は、受信信号が
解放完了であるか呼設定受付であるかを検出する(403)
。ここでは解放完了であるので切断理由の分析へ移る
(404) 。切断理由は「伝達能力不許可」であるからメモ
リテーブル3を参照して方路変更により接続される可能
性があるかを調べる(405) 。メモリテーブル3によれば
伝達能力不可は「再」であり、方路変更により接続され
る可能性があるので、ステップ401 へ戻って回線13から
発信を行う。この場合には、回線13,14の伝達能力がと
もに「非制限ディジタル」であり伝達能力の条件が満た
され交換機Cが呼設定メッセージを中継する。この呼設
定メッセージは交換機Dに受け付けられ、呼設定受付が
返送され呼出メッセージが返送され、端末16の応答によ
り応答メッセージが返送され、応答受付メッセージが交
換機C,D側へ送られて通話へと進む。以上の通信プロ
トコルが図5に示される。
It is assumed that a call is made from the terminal 15 to the terminal 16 with a transmission capability of "unrestricted digital". Then, the central control unit 36 of the exchange A detects whether or not there is a route that can be selected as the call processing control means 2 (401), and since the route has the route, it sends a call setting message through the line 11 (402). Then, the exchange B tries to relay to the line 12, but since the transmission capacity of the line 12 is "unrestricted digital impossibility", the exchange A returns a disconnection completion message which is a disconnection message. Upon completion of the release, the reason for disconnection is that the transmission capability is not permitted and data indicating that the signal source is the transit exchange is included and returned. Therefore, the central control unit 36 of the exchange A detects whether the received signal is release completion or call setting acceptance (403).
. Since release is complete here, move to analysis of the reason for disconnection
(404). Since the reason for disconnection is "transmission capability not permitted", the memory table 3 is referred to check whether there is a possibility of connection by changing the route (405). According to the memory table 3, the transmission capability is "re" and there is a possibility of connection due to the change of the route, so the process returns to step 401 and the transmission is made from the line 13. In this case, the transfer capacities of the lines 13 and 14 are both "unlimited digital", the transfer capacity condition is satisfied, and the exchange C relays the call setup message. This call setting message is accepted by the exchange D, the call setting acceptance is returned, the call message is returned, the response message is returned by the response from the terminal 16, and the response acceptance message is sent to the exchanges C, D to make a call. move on. The above communication protocol is shown in FIG.

【0011】なお、本実施例では発呼に係る端末が属す
る交換機において切断理由の分析を行って、方路の変更
の可否を判定したが、中継交換機において上記と同様の
処理を行ってもよい。
In this embodiment, the reason for disconnection is analyzed in the exchange to which the calling terminal belongs to determine whether or not the route can be changed. However, the relay exchange may perform the same processing as above. ..

【0012】[0012]

【発明の効果】以上説明したように本発明によれば、切
断メッセージに含まれる原因データに基づいてメモリテ
ーブルを検索することで方路の再選択により呼処理を継
続できるか否かが検出され、無要な呼処理が継続される
ことなく、従来よりも相手端末に接続され易くなる。
As described above, according to the present invention, it is detected whether or not call processing can be continued by reselecting a route by searching the memory table based on the cause data included in the disconnection message. As a result, unnecessary call processing is not continued, and it becomes easier to connect to the partner terminal than before.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例のブロック図。FIG. 1 is a block diagram of an embodiment of the present invention.

【図2】本発明により構成した通信システムのブロック
図。
FIG. 2 is a block diagram of a communication system configured according to the present invention.

【図3】構内交換機のブロック図。FIG. 3 is a block diagram of a private branch exchange.

【図4】本発明の一実施例の動作を示すフローチャー
ト。
FIG. 4 is a flowchart showing the operation of the embodiment of the present invention.

【図5】本発明の一実施例による通信プロトコルを示す
図。
FIG. 5 is a diagram showing a communication protocol according to an embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1 電話システム 2 呼処理制御手段 3 メモリテーブル 4 網制御手段 5 第1網 6 第2網 7 第3網 8,15,16 端末 9,11〜14 回線 A〜D 交換機 DESCRIPTION OF SYMBOLS 1 Telephone system 2 Call processing control means 3 Memory table 4 Network control means 5 1st network 6 2nd network 7 3rd network 8,15,16 Terminal 9,11-14 line A-D switch

Claims (1)

【特許請求の範囲】 【請求項1】 複数の網に接続され、この網の少なくと
も一つとの接続に使用されている回線が共通線信号方式
となっている電話システムにおいて、 前記回線から返送される切断メッセージに含まれる原因
データ対応に方路の再選択により呼処理を継続できるか
否かのデータが記憶されたメモリテーブルと、 前記複数の網との間で制御データの送受を行う網制御手
段と、 与えられる呼処理要求に応じて前記網制御手段を制御し
て呼設定メッセージを所要網に対し送出させ、切断メッ
セージが返送された場合には当該メッセージに含まれる
原因データに基づき前記メモリテーブルを検索して呼処
理を継続できるか否か判定し、判定結果に基づき前記網
制御手段を制御する呼処理制御手段とを備えたことを特
徴とする電話システム。
Claim: What is claimed is: 1. A telephone system connected to a plurality of networks, wherein the line used for connection with at least one of the networks is a common line signaling system, wherein the line is returned from the line. A network table for transmitting / receiving control data between the plurality of networks and a memory table storing data as to whether or not call processing can be continued by reselecting a route in response to the cause data included in the disconnection message. Means for controlling the network control means in response to a given call processing request to send a call setup message to the required network, and when a disconnection message is returned, the memory based on the cause data contained in the message. A telephone system comprising a call processing control means for searching the table to determine whether or not the call processing can be continued, and controlling the network control means based on the determination result. Temu.
JP19123091A 1991-07-05 1991-07-05 Telephone system Withdrawn JPH0514957A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19123091A JPH0514957A (en) 1991-07-05 1991-07-05 Telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19123091A JPH0514957A (en) 1991-07-05 1991-07-05 Telephone system

Publications (1)

Publication Number Publication Date
JPH0514957A true JPH0514957A (en) 1993-01-22

Family

ID=16271067

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19123091A Withdrawn JPH0514957A (en) 1991-07-05 1991-07-05 Telephone system

Country Status (1)

Country Link
JP (1) JPH0514957A (en)

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Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 19981008