JPS61193552A - Conference telephone set - Google Patents

Conference telephone set

Info

Publication number
JPS61193552A
JPS61193552A JP3287285A JP3287285A JPS61193552A JP S61193552 A JPS61193552 A JP S61193552A JP 3287285 A JP3287285 A JP 3287285A JP 3287285 A JP3287285 A JP 3287285A JP S61193552 A JPS61193552 A JP S61193552A
Authority
JP
Japan
Prior art keywords
conference
subscriber
telephone
registered
telephone device
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
Application number
JP3287285A
Other languages
Japanese (ja)
Other versions
JPH0636531B2 (en
Inventor
Kenji Ashihara
芦原 憲二
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP60032872A priority Critical patent/JPH0636531B2/en
Publication of JPS61193552A publication Critical patent/JPS61193552A/en
Publication of JPH0636531B2 publication Critical patent/JPH0636531B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M3/00Automatic or semi-automatic exchanges
    • H04M3/42Systems providing special services or facilities to subscribers
    • H04M3/56Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To improve the serviceability and the rapidness of a conference by calling simultaneously called members who are registered to attend the conference according to a call request of the conference by a specific dial and making the multi-party calls possible after the response of the called to the conference. CONSTITUTION:When the subscriber's equipment 6A of a conference caller to call a conference telephone transmits a specific dial, a CPU 1 obtains #A1 as a pointer LFTLSTP by this specific dial. Based upon the #A1, and address table CFTLSTH is searched and a #Am is obtained which searches an INDEX 3 by assigning the index INDEX 3. So that the numbers of called subscribers 6B-6N are registered in the INDEX 3, the numbers are read out in order and CPU 1 selects a corresponding registered number of the called subscribers 6B-6N out of these registered numbers and transmits a call. When every called subscriber 6B-6N receives a ringing tone from RG8B-8N, normal responses are carried out if not absent. Thus, a remarkable effect in the improvement at serviceability and rapidness of the conference telephone is obtained.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は、会議電話装置に関する。[Detailed description of the invention] [Field of application of the invention] The present invention relates to conference telephone equipment.

〔発明の背景〕[Background of the invention]

会議招集に係る加入者からの特定ダイヤルによる会議招
集を行う会議電話方法には、特開昭57−147367
号公報記載のものがある。この従来例は、特定ダイヤル
により直接中継台の呼出しを行い、その中継台からオペ
レータにより当該会議被招集者を呼出し、その応答後、
被招集者を手動により順次切替えて会議招集者と被招集
者との接続を行う。これによって、多者通話状態にさせ
た。
A conference telephone method for convening a conference using a specific dial from a subscriber is disclosed in Japanese Patent Application Laid-Open No. 57-147367.
There is one mentioned in the publication. In this conventional example, a specific dial is used to directly call an attendant, an operator calls the conference attendee from the attendant, and after the answer,
The conference convenor and the invitees are connected by manually switching the invitees one by one. This resulted in a multiparty call.

この従来例は、中継台のオペレータが介在するため、接
続完了までの時間が長いとの問題があった。
This conventional example has a problem in that it takes a long time to complete the connection because the relay stand operator intervenes.

〔発明の目的〕[Purpose of the invention]

本発明の目的は、予め登録されている会議被招集者を同
時に呼出し、接続し、サービス性、迅速性を向上させて
なる会議電話装置を提供するものである。
SUMMARY OF THE INVENTION An object of the present invention is to provide a conference telephone device that can simultaneously call and connect pre-registered conference attendees to improve serviceability and promptness.

〔発明の概要〕[Summary of the invention]

本発明は、会議招集に係る加入者(招集者)からの特定
ダイヤルによる会議招集要求に従って、予め登録されて
いる会議被招集者を、同時に呼出し。
The present invention simultaneously calls pre-registered conference invitees in response to a conference convocation request made by a specific dial from a subscriber (convener) involved in convening a conference.

会議被招集者の応答後、それらを上記会議招集に係る加
入者と多者通話状態にすることにより、一般の内線接続
と同等操作及び同等時間内に会議接続を完了させること
を可能とした。
After the conference invitee responds, by placing them in a multi-party conversation state with the subscriber involved in convening the conference, it is possible to complete the conference connection in the same operation and within the same time as a general extension connection.

〔発明の実施例〕[Embodiments of the invention]

第1図は本発明の会議電話装置の実施例を示す図である
。第2図はテーブルアクセスの説明図である。
FIG. 1 is a diagram showing an embodiment of the conference telephone device of the present invention. FIG. 2 is an explanatory diagram of table access.

第1図で、中央処理装置(CPU)1は、全体の制御・
管理を行う。主メモリ(MM)2は、CPU1の動作ソ
フトウェア及び制御・管理のための各種データを格納す
る。CPUIとMM2とはバス10を介して交信を行う
。信号送受信装置(SRD)3は、スイッチネットワー
ク4(及びCFT5)とバス10とを結ぶインターフェ
ースの機能を果す。
In FIG. 1, a central processing unit (CPU) 1 is responsible for overall control and
Perform management. The main memory (MM) 2 stores operating software for the CPU 1 and various data for control and management. CPUI and MM2 communicate via bus 10. The signal transmitting/receiving device (SRD) 3 functions as an interface connecting the switch network 4 (and CFT 5) and the bus 10.

スイッチネットワーク4は、CPUIの制御を受け、回
線接続を行う。トランク5は、多者会議用トランクであ
り、多者通話の通流電流の供給及び監視機能を持つ。
The switch network 4 performs line connections under the control of the CPUI. The trunk 5 is a trunk for multi-party conferences, and has a function of supplying and monitoring current for multi-party calls.

加入者電話機6A、6B、6D、・・・、6Nは多者通
話用加入者であり、加入者電話機6Aが会議招集に係る
加入者、加入者電話機6B〜6Nが、会議被招集に係る
加入者である。更に、リングバックトーン(RB T)
 7は返送用呼出し音の音源、リングトーン発生器(R
G)8B〜8Nは呼出し音源である。
Subscriber telephones 6A, 6B, 6D, . . . , 6N are subscribers for multiparty calls, subscriber telephone 6A is a subscriber related to convening a conference, and subscriber telephones 6B to 6N are subscribers related to convening a conference. I am a person. Furthermore, ringback tone (RBT)
7 is the sound source of the return ring tone, a ring tone generator (R
G) 8B to 8N are ringing sound sources.

動作を説明する。Explain the operation.

先ず、加入者電話機6Aから会議招集用に割当てた特定
ダイヤルを送信すると、CPUIは、5RD3を介して
これを検出しスイッチネットワーク4の通話路を設定し
、加入者電話機6Aを会議トランク5の招集者通話路端
子Aに接続する。
First, when the subscriber telephone 6A transmits a specific dial assigned for convening a conference, the CPUI detects this via the 5RD3, sets up a call path for the switch network 4, and calls the subscriber telephone 6A to the conference trunk 5. Connect to terminal A of the communication path.

次にCPUは加入電話機6Aと会議招集を契約している
被招集者用加入電話機6B〜6Nをサーチする。このサ
ーチは第2図の手順に従う。
Next, the CPU searches for subscriber telephones 6B to 6N for invitees that have a contract with subscriber telephone 6A to convene a conference. This search follows the procedure shown in FIG.

第2図で、CFTLSTは、会議電話用に登録した登録
テーブルであり、複数個のインデックスI N D E
 X 2〜I N D E X mより成る。各インデ
ックスINDEXiは、電話会議として登録してなる被
招集者用加入電話機の番号を格納する。今、インデック
スINDEX3に招集者用加入電話機6A用に登録した
被招集者加入者番号を登録しておくとすると、INDE
X3には、6B〜6Nの番号が登録されていることにな
る。インデックスアドレステーブルCFTLSTHには
、各インデックス2〜mの先頭番地#A2〜#Amを登
録しておく。このインデックスアドレステーブルCFT
LSTHのアドレス指定をボ、インタCFTLSTPが
行う。このポインタCFTLSTPは、会議招集者の加
入者6Aによる招集データより得る。
In FIG. 2, CFTLST is a registration table registered for conference calls, and includes a plurality of indexes I N D E
Consists of X 2 to I N D E X m. Each index INDEXi stores the number of a telephone subscriber for a participant registered as a telephone conference. Now, suppose that the subscriber number of the invitee registered for the subscriber telephone 6A is registered in the index INDEX3.
Numbers 6B to 6N are registered in X3. The first addresses #A2 to #Am of each index 2 to m are registered in the index address table CFTLSTH. This index address table CFT
The inter-CFTLSTP specifies the address of the LSTH. This pointer CFTLSTP is obtained from the convening data by the subscriber 6A who is the conference convenor.

かかる構成のもとで、第2図によれば、会議招集者の加
入機6Aが会議電話を招集すべく、特定ダイヤル(ブツ
シュ)を廻し、送信する。この特定ダイヤルからCPU
Iは、ポインタLFTLSTPとして#A1を得る。こ
の#A1をもとに、アドレステーブルCFTLSTHを
サーチし、#Amを得る。この#Amは、インデックス
INDEX3の先頭番地を指定したことにより、IND
EX3をサーチする。INDEX3には、被招集加入者
6B〜6Nの番号が登録(DNO”DNn)されている
故、この登録番号を順次読出す。この登録番号からCP
UIは登録番号対応の被招集用加入者6B〜6Nを選択
し、呼出し音を送出する。
Under such a configuration, as shown in FIG. 2, the subscriber 6A of the conference convener turns a specific dial (button) and sends a message in order to convene a conference call. CPU from this specific dial
I obtains #A1 as pointer LFTLSTP. Based on this #A1, address table CFTLSTH is searched to obtain #Am. This #Am is IND by specifying the first address of index INDEX3.
Search EX3. Since the numbers of invited subscribers 6B to 6N are registered in INDEX3 (DNO"DNn), these registration numbers are read out sequentially. From this registration number, CP
The UI selects the invited subscribers 6B to 6N corresponding to the registration number and sends out a ring tone.

この呼出し音の送出は、リングトーン発生器8B〜6N
を駆動することによって行う。一方、会議招集機6Aに
対しては、CFT5の端子TにRBT7を接続しさせて
呼出し中である旨のリングバツクトーンを送る。
This ring tone is transmitted by ring tone generators 8B to 6N.
This is done by driving. On the other hand, for the conference convenor 6A, the RBT 7 is connected to the terminal T of the CFT 5, and a ring back tone indicating that the call is in progress is sent.

R08B〜8Nの呼出し音を受けて各被招集加入者6B
〜6Nは応答不可(不在とか話中とか)でなければ、正
規の応答を行う。この応答した加入者はスイッチネット
ワーク4を介して会議トランク5の被招集者端子B−N
に接続となる。このとき、RBT7からの呼出し音とC
FT5の接続が切断となり、応答した会議被招集者6B
〜6Nと会議招集者6Aの通話がCFT5を介して可能
となる。
Upon receiving the ringing tone of R08B to 8N, each invited subscriber 6B
~6N makes a normal response unless it is unavailable (absent, busy, etc.). This responding subscriber is connected via the switch network 4 to the attendee terminal B-N of the conference trunk 5.
It becomes connected to. At this time, the ring tone from RBT7 and the C
Meeting invitee 6B responded when the FT5 connection was disconnected.
~6N and the conference convener 6A can communicate via the CFT 5.

次に、会議被招集者の登録・削除・変更について説明す
る。
Next, registration, deletion, and modification of meeting invitees will be explained.

会議招集者が会議被招集者の登録を行う場合、会議登録
用に割当てた特定ダイヤルと会議トランク端子番号(0
1〜99)、会議被招集者の電話番号を連続してダイヤ
ルする。CPUIは、会議招集者の会議被招集者登録用
特定ダイヤル操作を上記した会議招集用特定ダイヤル信
号と同様の方法により検出し、第2図に示す会議招集デ
ータからのポインタCFTLSTPからCFTLSTH
のアドレス#A1を求め、CFTLSTHをダイヤルさ
れた特定ダイヤル番号によって索引し、会議被招集者の
電話番号が格納されているCFTLSTのアドレス#A
3を求める。さらに、CFTLSTをダイヤルされた会
議トランク端子番号によって索引し、ダイヤルされた会
議被招集者の電話番号を格納する。かくして、会議招集
者の特定ダイヤルによる会議被招集者の登録を実現でき
た。
When a conference convenor registers a conference invitee, the conference convenor must use the specific dial assigned for conference registration and the conference trunk terminal number (0
1 to 99), consecutively dial the telephone numbers of the conference invitees. The CPUI detects the conference convenor's specific dial operation for conference invitee registration in the same manner as the above-described specific dial signal for conference convocation, and uses pointers CFTLSTP to CFTLSTH from the conference convocation data shown in FIG.
Find address #A1 of CFTLST, index CFTLSTH by the specific dialed number, and find address #A of CFTLST where the telephone number of the conference invitee is stored.
Find 3. Additionally, CFTLST is indexed by the dialed conference trunk terminal number and stores the telephone number of the dialed conference attendee. In this way, it was possible to register the conference attendees using the specific dial of the conference convener.

変更を行う場合には、上述した方法により、既登録のデ
ータ上にデータを再登録することにより可能である。削
除については、会議被招集者の電話番号を削除用に割当
られた特定番号(例えば0000)とすることによって
、CPUIにより削除を識別し、会議被招集者の電話番
号を初期設定することにより、削除することができる。
Changes can be made by re-registering the data on top of the already registered data using the method described above. Regarding deletion, by setting the conference invitee's phone number to a specific number assigned for deletion (for example, 0000), the CPUI identifies the deletion, and by initializing the conference invitee's phone number, Can be deleted.

次に、会議被招集者が話中等により接続できなかった場
合、又は登録されていない加入者を会議に参加させたい
場合について説明する。
Next, a case will be described in which a conference invitee is unable to connect due to a busy conversation, or a case where an unregistered subscriber is desired to participate in the conference.

会議中に会議招集者が加入者電話機6Aをフッキング操
作すると、CPUIは会議招集加入者6Aをダイヤル受
信状態とし、ダイヤルトーンを会議招集者加入者6Aに
送出する。そこで、会議招集加入者6Aが呼出したい会
議被招集者の電話番号をダイヤルすると、会議招集加入
者6Aとダイヤルされた会議被招集者間がスイッチネッ
トワーク4を介して接続される。会議被招集者が応答し
、会議招集加入者6Aから会議の旨の連絡を受けた後、
会議招集者が加入者電話機6Aをフッキング操作すると
、CPUIは会議招集者の加入者6Aと会議被招集者間
のスイッチネットワークを解放し、会議招集者の加入者
6AをCFT5の端子Aに、また、会議被招集者の加入
者をCFT5のB−Nの中で、空いている端子にそれぞ
れスイッチネットワークを介して接続する6かくして。
When the conference convenor performs a hooking operation on the subscriber telephone 6A during the conference, the CPUI puts the conference convenor subscriber 6A into a dial receiving state and sends a dial tone to the conference convener subscriber 6A. Therefore, when the conference convening subscriber 6A dials the telephone number of the conference convened person he/she wishes to call, the conference convening subscriber 6A and the dialed conference convened party are connected via the switch network 4. After the conference invitee responds and receives notification of the conference from conference convening subscriber 6A,
When the conference convenor performs a hooking operation on the subscriber telephone 6A, the CPUI releases the switch network between the conference convenor's subscriber 6A and the conference invitee, and connects the conference convenor's subscriber 6A to terminal A of the CFT5. , 6 thus connecting the subscribers of the conference invitee to the respective free terminals in the B-N of the CFT 5 via the switch network.

CFTに会議被招集者を追加することとなる。The meeting invitee will be added to the CFT.

尚、RG8B〜8Nは、通常のリングトーン発生器とし
たが、会議電話専用の発生器を設けておけば、通常の電
話と区別できる利点を持つ。
Note that RG8B to 8N are used as ordinary ring tone generators, but if a generator dedicated to conference calls is provided, it has the advantage of being distinguishable from ordinary telephones.

〔発明の効果〕〔Effect of the invention〕

本発明によ九ば、一般の内線接続と同等操作及び同等時
間で会議を招集することができ、会議電話のサービス性
及び迅速性の向上に顕著な効果が得られる。
According to the present invention, it is possible to convene a conference with the same operation and the same time as with a general extension line connection, and a remarkable effect can be obtained in improving the serviceability and promptness of conference calls.

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

第1図は本発明の実施例図、第2図はインデックステー
ブルのサーチ例である。 1・・・中央処理装置(CP U)、2・・・主メモリ
(MM)、3・・・送受信回路(SRD)、4・・・ス
イッチネットワーク(S W)、5・・・会議トランク
(CF T)、6A〜6N・・・会議電話加入者(電話
機)。
FIG. 1 shows an embodiment of the present invention, and FIG. 2 shows an example of searching an index table. 1... Central processing unit (CPU), 2... Main memory (MM), 3... Transmitting/receiving circuit (SRD), 4... Switch network (SW), 5... Conference trunk ( CFT), 6A to 6N...Conference telephone subscribers (telephones).

Claims (1)

【特許請求の範囲】 1、スイッチネットワークと、会議トランクと、会議招
集者の加入者に対する会議被招集者の加入者番号を登録
しておくテーブルとを備えると共に、会議招集加入者か
らの会議招集時にはそのダイヤルに従って上記会議トラ
ンクの招集者端子にスイッチネットワークを介して会議
招集加入者を接続し、且つそのダイヤルからの会議招集
要求に従って上記テーブルを自動的にサーチして登録中
の会議被招集者の加入者番号を読出し、この被招集者の
加入者番号の中で応答した加入者を上記スイッチネット
ワークを介して会議トランクの被招集者端子に自動的に
接続せしめる会議電話装置。 2、上記テーブル内の加入者番号の削除、登録、変更を
会議招集加入者によるダイヤルによって実行させた特許
請求の範囲第1項記載の会議電話装置。 3、会議電話中にあって現在の被招集者以外の電話機を
会議電話に取り入れるに際して、招集加入者によるフッ
キング、ダイヤル操作により相手の応答を得られた場合
、該応答した電話機を上記会議トランクの未接続の被招
集者端子に自動的に接続せしめた特許請求の範囲第1項
記載の会議電話装置。 4、会議招集に際しての被招集加入者への呼出し音は、
一般の呼出し音と異ならしめた特許請求の範囲第1項記
載の会議電話装置。
[Scope of Claims] 1. A switch network, a conference trunk, and a table for registering the subscriber numbers of the conference invitees to the conference convenor's subscribers, and a system for accepting conference calls from the conference convenor's subscribers. Sometimes, according to the dial, a conference convening subscriber is connected to the convenor terminal of the conference trunk via a switch network, and the conference convener is registered by automatically searching the table according to the conference convocation request from the dial. The conference telephone device reads the subscriber number of the attendee and automatically connects the subscriber who responds in the subscriber number of the attendee to the invitee terminal of the conference trunk via the switch network. 2. The conference telephone device according to claim 1, wherein deletion, registration, and change of subscriber numbers in the table are executed by dialing by a subscriber convening a conference. 3. When a telephone other than the currently invited party is called into the conference call, if the calling party obtains a response by hooking or dialing, the telephone that answered will be transferred to the above-mentioned conference trunk. The conference telephone device according to claim 1, wherein the conference telephone device is automatically connected to an unconnected attendee terminal. 4. When convening a meeting, the ring tone for the invited participants is as follows:
The conference telephone device according to claim 1, wherein the conference telephone device has a different ring tone from a general ring tone.
JP60032872A 1985-02-22 1985-02-22 Conference phone system Expired - Lifetime JPH0636531B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60032872A JPH0636531B2 (en) 1985-02-22 1985-02-22 Conference phone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60032872A JPH0636531B2 (en) 1985-02-22 1985-02-22 Conference phone system

Publications (2)

Publication Number Publication Date
JPS61193552A true JPS61193552A (en) 1986-08-28
JPH0636531B2 JPH0636531B2 (en) 1994-05-11

Family

ID=12370956

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60032872A Expired - Lifetime JPH0636531B2 (en) 1985-02-22 1985-02-22 Conference phone system

Country Status (1)

Country Link
JP (1) JPH0636531B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63240253A (en) * 1987-03-27 1988-10-05 Fujitsu Ltd Simplified system for reservation registration
JPH01264463A (en) * 1988-04-15 1989-10-20 Nec Corp System for sharing preset type conference telephone system
JPH01280952A (en) * 1988-05-06 1989-11-13 Nec Corp Conference telephone system
JPH04117859A (en) * 1990-09-07 1992-04-17 Matsushita Electric Ind Co Ltd Private branch of automatic exchange
JP2006210997A (en) * 2005-01-25 2006-08-10 Nec Infrontia Corp Three-party speech system and key telephone system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5348402A (en) * 1976-10-15 1978-05-01 Hitachi Ltd Automatic telephone service system for convention
JPS5739664A (en) * 1980-08-22 1982-03-04 Hitachi Ltd Conference telephone communication system
JPS5780853A (en) * 1980-11-06 1982-05-20 Nec Corp Simultaneous call connection system
JPS5864860A (en) * 1981-10-14 1983-04-18 Matsushita Electric Ind Co Ltd Automatic exchange
JPS5870672A (en) * 1981-10-22 1983-04-27 Matsushita Electric Ind Co Ltd Automatic exchange

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5348402A (en) * 1976-10-15 1978-05-01 Hitachi Ltd Automatic telephone service system for convention
JPS5739664A (en) * 1980-08-22 1982-03-04 Hitachi Ltd Conference telephone communication system
JPS5780853A (en) * 1980-11-06 1982-05-20 Nec Corp Simultaneous call connection system
JPS5864860A (en) * 1981-10-14 1983-04-18 Matsushita Electric Ind Co Ltd Automatic exchange
JPS5870672A (en) * 1981-10-22 1983-04-27 Matsushita Electric Ind Co Ltd Automatic exchange

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63240253A (en) * 1987-03-27 1988-10-05 Fujitsu Ltd Simplified system for reservation registration
JPH01264463A (en) * 1988-04-15 1989-10-20 Nec Corp System for sharing preset type conference telephone system
JPH01280952A (en) * 1988-05-06 1989-11-13 Nec Corp Conference telephone system
JPH04117859A (en) * 1990-09-07 1992-04-17 Matsushita Electric Ind Co Ltd Private branch of automatic exchange
JP2006210997A (en) * 2005-01-25 2006-08-10 Nec Infrontia Corp Three-party speech system and key telephone system
JP4583949B2 (en) * 2005-01-25 2010-11-17 Necインフロンティア株式会社 The present invention relates to a three-party call system and a button telephone device.

Also Published As

Publication number Publication date
JPH0636531B2 (en) 1994-05-11

Similar Documents

Publication Publication Date Title
US7412047B2 (en) Conference call setup automation
US7363030B2 (en) Establishing a conference call from a call-log
JP3940526B2 (en) Telephone exchange equipment
JPS61193552A (en) Conference telephone set
JPH06141084A (en) Private branch exchange
JP4422096B2 (en) Call group selection method and switching device thereof
JPH05344225A (en) Connection method for conference call
JPH0983651A (en) Exchange
JPH01228255A (en) System for calling attendee at conference telephone
KR910001678B1 (en) Multiple calling method by one calling pabx
KR100290929B1 (en) Method of Simultanineously Calling a lot of Registered Members in Communication System
JPH10215317A (en) Method and device for conference speech connection
JP3325330B2 (en) Electronic exchange
JPS63244961A (en) Automatic connection system for conference telephone
JPS59139758A (en) Conference system
JPS60121865A (en) Step call system
JPS611197A (en) Extension connection system
JPS5864860A (en) Automatic exchange
JPH04287557A (en) Conference telephone simultaneous invitation system
JPH0399568A (en) Callback system in exchange
KR19980027085A (en) How to specify a forced call ring in keyphone system
JPH03273744A (en) Conference telephone connecting system
JPH04127651A (en) Personal communication system
JPH03289247A (en) Automatic reply information transfer equipment
JPH0265452A (en) Private branch of electronic exchange

Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term