JPH07123455A - Rerouting system for private network using isdn leased line - Google Patents
Rerouting system for private network using isdn leased lineInfo
- Publication number
- JPH07123455A JPH07123455A JP5268515A JP26851593A JPH07123455A JP H07123455 A JPH07123455 A JP H07123455A JP 5268515 A JP5268515 A JP 5268515A JP 26851593 A JP26851593 A JP 26851593A JP H07123455 A JPH07123455 A JP H07123455A
- Authority
- JP
- Japan
- Prior art keywords
- station
- epbx
- isdn
- call
- leased line
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 claims description 14
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
Landscapes
- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Exchange Systems With Centralized Control (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はデジタル構内交換機によ
り構築されるプライベート・ネットワークにおけるリル
ーチング方式に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rerouting system in a private network constructed by a digital private branch exchange.
【０００２】[0002]
【従来の技術】図５は、従来の個別線専用線で構築され
たプライベート・ネットワークの中継方式例を示す図
で、デジタル電子構内交換機であるＥＰＢＸ（Ａ局）に
収容されている端末（発信者）１０がＥＰＢＸ（Ｄ局）
に収容されている端末（着信先）１２へ接続操作をする
場合の例である。2. Description of the Related Art FIG. 5 is a diagram showing an example of a relay system of a private network constructed by a conventional private line dedicated line, which is a terminal accommodated in an EPBX (station A) which is a digital electronic private branch exchange. 10) EPBX (Station D)
This is an example of a case where a connection operation is performed to the terminal (destination) 12 accommodated in.
【０００３】発信者のダイヤル操作で、個別線専用線２
１を介して、ＥＰＢＸ（Ｂ局）へ発信し、同様に個別線
専用線２２を介してＥＰＢＸ（Ｃ局）へ発信する。この
とき、同図に示すようにＣ局で相手ルートに対し障害又
は全話中で迂回ルートがない場合、話中音（ＢＴ）接続
で呼損となる。Individual line dedicated line 2 by the dialing operation of the caller
1 to EPBX (station B), and similarly to individual line dedicated line 22 to EPBX (station C). At this time, as shown in the figure, if there is no obstacle to the partner route at the station C or there is no detour route during the whole talk, the busy tone (BT) connection causes a call loss.
【０００４】[0004]
【発明が解決しようとする課題】このように従来技術で
は、ＥＰＢＸ（Ｂ局）に個別線専用線又はＩＳＤＮ専用
線の迂回ルート２５があるにもかかわらず、ＥＰＢＸ
（Ｃ局）に発信処理を行ない、ＥＰＢＸ（Ｃ局）で相手
ルートが確保できない為、有効な迂回処理が行なわれな
いという問題点があった。As described above, in the prior art, the EPBX (station B) has the bypass route 25 for the dedicated line or ISDN dedicated line, but the EPBX
However, there is a problem in that effective route processing is not performed because the originating route is sent to (C station) and the partner route cannot be secured in EPBX (C station).
【０００５】すなわち、個別専用線２５は中継局間の障
害又は全話中の迂回ルートとしてではなく、ＥＰＢＸ
（Ｅ局）に収容されている端末への接続処理のときにＥ
ＰＢＸ（Ｃ局）およびＥＰＢＸ（Ｄ局）を中継しないた
めのルートとして使用されるだけであった。したがっ
て、従来技術のプライベート・ネットワークでは柔軟性
に欠け、使い勝手の悪いものであった。That is, the individual leased line 25 is not used as a fault between relay stations or as a detour route during the entire talk, but as an EPBX.
E when connecting to a terminal accommodated in (E station)
It was only used as a route for not relaying PBX (station C) and EPBX (station D). Therefore, prior art private networks lacked flexibility and were inconvenient to use.
【０００６】本発明は個別線専用線のみならずＩＳＤＮ
専用線で構築されたプライベート・ネットワークにおい
てルート迂回機能が有効に行なわれないという欠点を解
消し、中継局間の障害又は全話中の際に迂回ルートを有
効に設定できるＩＳＤＮ専用線を用いたプライベート・
ネットワークにおけるリルーチング方式を提供すること
を目的とする。The present invention is applicable to ISDN as well as individual lines.
The ISDN leased line was used to solve the drawback that the route detour function is not effectively performed in the private network constructed with the leased line and to enable the detour route to be effectively set when there is a failure between relay stations or during all talk. private·
An object is to provide a rerouting method in a network.
【０００７】[0007]
【課題を解決するための手段】本発明は上述の課題を解
決するために、ＩＳＤＮ専用線を収容したデジタル構内
交換機は、ＩＳＤＮレイヤ３における切断メッセージの
理由情報要素を識別する手段を備え、発信局のみならず
中継局においても迂回ルートがあれば迂回処理を行な
う。In order to solve the above-mentioned problems, the present invention provides a digital private branch exchange containing an ISDN leased line with means for identifying a reason information element of a disconnection message in ISDN layer 3, If there is a detour route not only at the station but also at the relay station, detour processing is performed.
【０００８】[0008]
【作用】本発明によれば、第１のデジタル構内交換機に
収容されている第１の内線端末より中継局を介して第２
のデジタル構内交換機に収容されている第２の内線端末
への接続処理を行うＩＳＤＮ専用線を用いたプライベー
ト・ネットワークにおけるリルーチング方式において、
各デジタル構内交換機間ではＩＳＤＮ回線のＤチャネル
を介して呼設定を行い、この呼設定を行ったデジタル構
内交換機からＩＳＤＮレイヤ３情報要素の理由情報を含
めた切断メッセージを受信すると、この切断メッセージ
を受信したデジタル構内交換機は迂回ルートが有るか否
かを判断し、迂回ルートが有る場合にはこの切断メッセ
ージを送信したデジタル交換機との呼の解放処理を行う
とともに、迂回ルートでの新たな発呼処理を行う。According to the present invention, the first extension terminal accommodated in the first digital PBX exchanges the second extension via the relay station.
In the rerouting method in the private network using the ISDN leased line for connecting to the second extension terminal accommodated in the digital private branch exchange of
A call setup is performed between the digital private branch exchanges via the D channel of the ISDN line, and when a disconnection message including the reason information of the ISDN layer 3 information element is received from the digital private branch exchange that has performed this call setup, this disconnection message is sent. The received digital private branch exchange judges whether or not there is a detour route, and if there is a detour route, it releases the call with the digital exchange that sent this disconnect message and also makes a new call on the detour route. Perform processing.
【０００９】[0009]
【実施例】次に添付図面を参照して本発明によるＩＳＤ
Ｎ専用線を用いたプライベート・ネットワークにおける
リルーチング方式の実施例を詳細に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, referring to the attached drawings, ISD according to the present invention will be described.
An example of a rerouting method in a private network using N leased lines will be described in detail.
【００１０】図２は、本発明によるＩＳＤＮ専用線で構
築されプライベート・ネットワークの実施例を示す中継
方式であり、ここには従来技術で説明した図５と同様に
ＥＰＢＸ（Ｃ局）とＥＰＢＸ（Ｅ）局間が障害又は全話
中の場合を示している。なお、本実施例では局間の中継
線１〜５はＩＳＤＮ専用線が用いられている。FIG. 2 is a relay system showing an embodiment of a private network constructed by an ISDN leased line according to the present invention, in which EPBX (station C) and EPBX (station B) are the same as in FIG. 5 described in the prior art. E) Shows a case where there is a fault between stations or when all stations are busy. In this embodiment, ISDN dedicated lines are used as the relay lines 1 to 5 between the stations.
【００１１】図３は、図２に示したＩＳＤＮ専用線にお
ける迂回ルートが無い場合の通常のシーケンス例であ
る。したがってこのシーケンス例ではリルーチングを行
わない場合、すなわち図２に示したＥＰＢＸ（Ｂ局）−
ＥＰＢＸ（Ｅ局）間のＩＳＤＮ専用線５が無い場合の端
末１０から端末１２への接続処理例を示している。FIG. 3 shows an example of a normal sequence when there is no detour route in the ISDN leased line shown in FIG. Therefore, in this sequence example, when rerouting is not performed, that is, the EPBX (station B) shown in FIG.
An example of connection processing from the terminal 10 to the terminal 12 when there is no ISDN leased line 5 between EPBXs (E stations) is shown.
【００１２】ＥＰＢＸ（Ａ局）に収容されている端末
（発信者）１０のダイヤル操作で、ＩＳＤＮ専用線１を
介して、呼設定（ＳＥＴＵＰ）メッセージを送出し、Ｅ
ＰＢＸ（Ｂ局）より呼設定受付（ＣＡＬＬ＿ＰＲＯＣ）
メッセージを受信する。同様にＥＰＢＸ（Ｂ局）では呼
設定（ＳＥＴＵＰ）メッセージの接続先番号（着番号）
を翻訳し、ＩＳＤＮ専用線２を介して発信操作を行な
う。A dial operation of the terminal (caller) 10 accommodated in the EPBX (station A) sends out a call setup (SETUP) message via the ISDN leased line 1, and E
Call setup acceptance (CALL_PROC) from PBX (station B)
Receive the message. Similarly, in EPBX (station B), the connection destination number (called number) of the call setup (SETUP) message
Is translated and the originating operation is performed via the ISDN leased line 2.
【００１３】しかし、ＥＰＢＸ（Ｃ局）は、ＥＰＢＸ
（Ｅ局）の中継ルートが障害又は全話中で迂回ルートが
ない為、通常の切断メッセージ（ＤＩＳＣ）をＥＰＢＸ
（Ｂ局）に行う。ＥＰＢＸ（Ｂ局）はＥＰＢＸ（Ｃ局）
と同様に迂回ルートがあるかどうかを判断するが、この
場合にはＩＳＤＮ専用線５が無い為、ＥＰＢＸ（Ａ局）
に対して切断シーケンス（ＤＩＳＣ）を行うとともに、
ＥＰＢＸ（Ｃ局）に対し解放メッセージ（ＲＥＬ）を送
信し、Ｃ局より解放完了メッセージ（ＲＥＬ＿ＣＯＭ
Ｐ）を受信することで解放シーケンスを終了する。However, EPBX (station C) is
Since the relay route of (E station) is faulty or there is no detour route in all talks, normal disconnect message (DISC) is sent to EPBX
(Station B) EPBX (station B) is EPBX (station C)
It is judged whether or not there is a detour route in the same manner as, but in this case there is no ISDN leased line 5, so EPBX (Station A)
Disconnecting sequence (DISC) to
Release message (REL) is sent to EPBX (C station), and release completion message (REL_COM) is sent from C station.
The release sequence is ended by receiving P).
【００１４】ＥＰＢＸ（Ａ局）は、切断メッセージ（Ｄ
ＩＳＣ）をＥＰＢＸ（Ｂ局）より受信すると、発信者の
端末１０に対し話中音（ＢＴ）接続で呼損とするととも
に、ＥＰＢＸ（Ｂ局）に対し解放メッセージ（ＲＥＬ）
や解放完了メッセージ（ＲＥＬ＿ＣＯＭＰ）の解放シー
ケンスを行う。The EPBX (station A) sends a disconnection message (D
When the ISC) is received from the EPBX (B station), the caller's terminal 10 loses the call due to the busy tone (BT) connection, and the EPBX (B station) releases the message (REL).
The release sequence of the release completion message (REL_COMP) is performed.
【００１５】図１は、図２のＩＳＤＮ専用線５によって
リルーチング処理を行う場合の実施例を示すシーケンス
例であり、図４はそのときのリルーチング処理の概要フ
ローチャートである。以下、これら図を用いてＥＰＢＸ
（Ａ局）に収容されている端末１０よりＥＰＢＸ（Ｄ
局）に収容されている端末１２への接続処理を説明す
る。FIG. 1 is a sequence example showing an embodiment in which the rerouting process is performed by the ISDN leased line 5 of FIG. 2, and FIG. 4 is a schematic flowchart of the rerouting process at that time. Below, using these figures, EPBX
From terminal 10 accommodated in (Station A), EPBX (D
A process of connecting to a terminal 12 accommodated in a station will be described.
【００１６】図１において、ＥＰＢＸ（Ａ局）に収容さ
れている発信端末１０のダイヤル操作により、ＥＰＢＸ
（Ａ局）はＥＰＢＸ（Ｂ局）に対してＩＳＤＮ専用線１
のＤチャネルを介して呼設定（ＳＥＴＵＰ）メッセージ
を送出し、ＥＰＢＸ（Ｂ局）より呼設定受付（ＣＡＬＬ
＿ＰＲＯＣ）メッセージを受信する。同様にＥＰＢＸ
（Ｂ局）では呼設定（ＳＥＴＵＰ）メッセージの接続先
番号（着番号）を翻訳し、ＩＳＤＮ専用線２を介して発
信操作を行う。In FIG. 1, the EPBX (station A) accommodates the EPBX by dialing the transmitting terminal 10 accommodated therein.
(Station A) is an ISDN leased line 1 for EPBX (Station B)
The call setup (SETUP) message is sent out via the D channel of the device, and the call setup acceptance (CALL) is sent from the EPBX (station B).
_PROC) message is received. Similarly, EPBX
At the (B station), the connection destination number (called number) of the call setup (SETUP) message is translated, and the originating operation is performed via the ISDN leased line 2.
【００１７】しかし、図２に示すようにＥＰＢＸ（Ｃ
局）では相手ルートに対し、障害又は全話中で迂回ルー
トがない為、ＥＰＢＸ（Ｂ局）に対してＩＳＤＮレイヤ
３情報要素の理由情報（例えば、＃３：相手ルートな
し）を含めた切断（ＤＩＳＣ）メッセージを送出する。
そして、ＥＰＢＸ（Ｂ局）はＥＰＢＸ（Ｃ局）に対し解
放メッセージ（ＲＥＬ）を送信し、Ｃ局より解放完了メ
ッセージ（ＲＥＬ＿ＣＯＭＰ）を受信する。ここまでの
シーケンスは図３で示した通常のＩＳＤＮ専用線のシー
ケンスと同じである。However, as shown in FIG. 2, EPBX (C
Disconnection including reason information (for example, # 3: no partner route) of the ISDN layer 3 information element for EPBX (station B) because there is no obstacle or a detour route in all talks with respect to the partner route (DISC) message is sent.
Then, the EPBX (B station) transmits a release message (REL) to the EPBX (C station) and receives a release completion message (REL_COMP) from the C station. The sequence up to this point is the same as the sequence of the normal ISDN leased line shown in FIG.
【００１８】一方、ＥＰＢＸ（Ｂ局）ではＩＳＤＮレイ
ヤ３情報要素の理由情報を含めた切断（ＤＩＳＣ）メッ
セージを受信すると、図４のフローチャートに示すよう
に、迂回ルートが有るかどうかを判断し、迂回ルートが
有りかつそれが“空”の場合はリルーチング処理を行な
う。すなわち、ＥＰＢＸ（Ｂ局）−ＥＰＢＸ（Ｃ局）間
の呼の解放処理を行った後、迂回ルートであるＩＳＤＮ
専用線５に対して新たに発信シーケンス（ＳＥＴＵＰ，
ＣＡＬＬ ＰＲＯＣ）を行い、ＥＰＢＸ（Ｅ局、Ｄ局）
を経由して、ＥＰＢＸ（Ｄ局）に収容されている着信端
末１２を呼び出す。On the other hand, when the EPBX (station B) receives the disconnection (DISC) message including the reason information of the ISDN layer 3 information element, it judges whether or not there is a detour route, as shown in the flowchart of FIG. If there is a detour route and it is “empty”, rerouting processing is performed. That is, after the call release process between the EPBX (station B) and the EPBX (station C) is performed, the ISDN which is the detour route.
A new transmission sequence (SETUP,
CALL PROC) and EPBX (E station, D station)
The called terminal 12 accommodated in the EPBX (station D) is called via the.
【００１９】ＥＰＢＸ（Ｄ局）からの呼出メッセージ
（ＡＬＥＲＴ）は、ＥＰＢＸ（Ｅ局）及びＥＰＢＸ（Ｂ
局）を経由してＥＰＢＸ（Ａ局）に送られ、呼出し音
（ＲＢＴ）が発呼端末１０で聴取される。そして、着信
端末１２が応答すると、同様のルートで応答メッセージ
（ＣＯＮＮ）及び応答確認メッセージ（ＣＯＮＮ ＡＣ
Ｋ）がＥＰＢＸ（Ａ局）に送られ、接続処理が完了す
る。The calling message (ALERT) from the EPBX (station D) is the EPBX (station E) and EPBX (B).
Via the station) to the EPBX (station A) and the ringing tone (RBT) is heard at the calling terminal 10. Then, when the receiving terminal 12 responds, a reply message (CONN) and a reply confirmation message (CONN) are taken along the same route. AC
K) is sent to EPBX (Station A), and the connection process is completed.
【００２０】リルーチング処理は図４に示すような条件
を満足する場合に行い、これら条件を満たさない場合に
は通常の切断シーケンスを行う。以下、その条件を示
す。 （ｉ）相手ルートより受信した切断（ＤＩＳＣ）メッセ
ージ中の理由情報要素の理由値が、あらかじめ設定して
あるデータ値（例えば＃３：相手ルートなし）と一致す
ること。 （ii）迂回ルートが有り、かつ空きチャネルがあるこ
と。The rerouting process is carried out when the conditions shown in FIG. 4 are satisfied, and the normal cutting sequence is carried out when these conditions are not satisfied. The conditions are shown below. (I) The reason value of the reason information element in the disconnection (DISC) message received from the partner route matches a preset data value (for example, # 3: no partner route). (Ii) There is a detour route and an available channel.
【００２１】このように本実施例によれば、ＩＳＤＮ専
用線で構築されたプライベート・ネットワークにおい
て、相手ルートに対する障害又は全話中を認識でき、有
効な迂回ルートを見つけて迂回処理が実現できる。As described above, according to the present embodiment, in the private network constructed by the ISDN leased line, it is possible to recognize the obstacle to the other party's route or the whole busy, and to find the effective detour route and realize the detouring process.
【００２２】なお、ＩＳＤＮ専用線はプロトコル・シー
ケンスが標準化されているが、本実施例はシーケンス
上、標準を準拠しており、プライベート・ネットワーク
内に本実施例に該当しないＥＰＢＸがあっても問題には
ならない。Note that the ISDN leased line has a standardized protocol sequence, but this embodiment conforms to the standard in terms of sequence, and there is a problem even if there is an EPBX that does not correspond to this embodiment in the private network. It doesn't.
【００２３】[0023]
【発明の効果】以上、詳細に説明したように本発明によ
れば、ＩＳＤＮ専用線で構築されたプライベート・ネッ
トワークにおいて、ＩＳＤＮレイヤ３情報を利用して、
切断シーケンス中にリルーチング（再迂回）処理を行な
う事により、今まで呼損となっていたものを有効な迂回
を行ない呼損率を最低限に抑えられるという効果があ
る。更に特別な装置も必要としない為、非常に安価にサ
ービスを行なうことができる。As described in detail above, according to the present invention, ISDN layer 3 information is used in a private network constructed by an ISDN leased line,
By performing the rerouting process during the disconnection sequence, there is an effect that the call loss rate can be minimized by effectively detouring what has been a call loss until now. Furthermore, since no special device is required, the service can be performed at a very low cost.
【図１】本発明によるＩＳＤＮ専用線を用いたプライベ
ート・ネットワークにおけるリルーチング方式の実施例
を示すリルーチング・シーケンス。FIG. 1 is a rerouting sequence showing an embodiment of a rerouting method in a private network using an ISDN leased line according to the present invention.
【図２】本発明によるプライベート・ネットワークの一
実施例を示す中継方式図。FIG. 2 is a relay system diagram showing an embodiment of a private network according to the present invention.
【図３】図２に示した中継方式における通常の呼処理シ
ーケンス。FIG. 3 shows a normal call processing sequence in the relay system shown in FIG.
【図４】本実施例におけるリルーチング処理の概要を示
すフローチャート。FIG. 4 is a flowchart showing an outline of rerouting processing in the present embodiment.
【図５】従来技術におけるプライベート・ネットワーク
の中継方式図。FIG. 5 is a relay system diagram of a private network in the related art.
１０，１２ 加入者端末 １〜５ ＩＳＤＮ専用線 10,12 Subscriber terminals 1-5 ISDN leased line
Claims (1)
いる第１の内線端末より中継局を介して第２のデジタル
構内交換機に収容されている第２の内線端末への接続処
理を行うＩＳＤＮ専用線を用いたプライベート・ネット
ワークにおけるリルーチング方式において、 各デジタル構内交換機間ではＩＳＤＮ回線のＤチャネル
を介して呼設定を行い、 前記呼設定を行ったデジタル構内交換機からＩＳＤＮレ
イヤ３情報要素の理由情報を含めた切断メッセージを受
信すると、 前記切断メッセージを受信したデジタル構内交換機は迂
回ルートが有るか否かを判断し、迂回ルートが有る場合
には前記切断メッセージを送信したデジタル交換機との
呼の解放処理を行うとともに、迂回ルートでの新たな発
呼処理を行うことを特徴とするＩＳＤＮ専用線を用いた
プライベート・ネットワークにおけるリルーチング方
式。1. An ISDN for connecting from a first extension terminal accommodated in a first digital private branch exchange to a second extension terminal accommodated in a second digital private branch exchange via a relay station. In the rerouting method in the private network using the leased line, the call setup is performed between the digital private branch exchanges via the D channel of the ISDN line, and the reason information of the ISDN layer 3 information element is sent from the digital private branch exchange that has performed the call setup. When the disconnect message including the disconnection message is received, the digital private branch exchange receiving the disconnect message determines whether or not there is a detour route, and if there is a detour route, releases the call with the digital exchange that transmitted the disconnect message. The ISDN leased line is characterized by performing new call processing on the detour route as well as processing. Rerouting method in the private network used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5268515A JP2855065B2 (en) | 1993-10-27 | 1993-10-27 | Rerouting method in private network using ISDN leased line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5268515A JP2855065B2 (en) | 1993-10-27 | 1993-10-27 | Rerouting method in private network using ISDN leased line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07123455A true JPH07123455A (en) | 1995-05-12 |
| JP2855065B2 JP2855065B2 (en) | 1999-02-10 |
Family
ID=17459591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5268515A Expired - Lifetime JP2855065B2 (en) | 1993-10-27 | 1993-10-27 | Rerouting method in private network using ISDN leased line |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2855065B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6798875B2 (en) * | 2001-12-19 | 2004-09-28 | General Electric Company | Method and system for rerouting telephone calls directed to a private branch exchange via a private corporate network |
-
1993
- 1993-10-27 JP JP5268515A patent/JP2855065B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6798875B2 (en) * | 2001-12-19 | 2004-09-28 | General Electric Company | Method and system for rerouting telephone calls directed to a private branch exchange via a private corporate network |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2855065B2 (en) | 1999-02-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH05895B2 (en) | ||
| JP3303776B2 (en) | Exchanger for connecting LAN telephone terminal and connection method therefor | |
| JPH08130577A (en) | Exchange apparatus and test method for the exchange apparatus | |
| JP2855065B2 (en) | Rerouting method in private network using ISDN leased line | |
| JPS59221197A (en) | Additional dial system | |
| JPS63222538A (en) | Information communication network | |
| JPH07236165A (en) | Bureau detour method | |
| JP2667823B2 (en) | Connection between telecommunications carriers | |
| JPS5868347A (en) | Incoming transfer system | |
| JPH0758996B2 (en) | Line configuration method | |
| JP3583051B2 (en) | Transit exchange and PBX relay connection method thereof | |
| JPS5923696A (en) | Subscriber connecting system of private branch exchange | |
| JPS6156565A (en) | Inter-office call-back system | |
| JPS5961391A (en) | Incoming system of message communication to subscriber accommodated in private branch of exchange | |
| JPH01164159A (en) | Trunk line transferring service system | |
| JPH08293924A (en) | Inter-station transfer method | |
| JPS6264155A (en) | Data line connection system | |
| JPH1013458A (en) | Facsimile accumulation exchange device | |
| JP2001358845A (en) | Line termination equipment | |
| JPH04132395A (en) | Route selection system | |
| JPH04270541A (en) | ISDN terminal control device | |
| JPS61278262A (en) | System for connecting outgoing relay line in telephone exchange system | |
| JPH04362845A (en) | User information transfer system | |
| JPS6046695A (en) | Connection system for data call | |
| JPH06245241A (en) | Private network control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19981110 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081120 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081120 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091120 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091120 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101120 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101120 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20111120 Year of fee payment: 13 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20111120 Year of fee payment: 13 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20121120 Year of fee payment: 14 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20121120 Year of fee payment: 14 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20131120 Year of fee payment: 15 |
|
| EXPY | Cancellation because of completion of term |