| Patents for H04M 3 - Automatic or semi-automatic exchanges (99,881) |
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| 05/07/1991 | US5014125 Television system for the interactive distribution of selectable video presentations |
| 05/07/1991 | CA1283986C Hold detecting and control circuit for a key telephone system |
| 05/07/1991 | CA1283967C Broadband signal switching apparatus |
| 05/02/1991 | WO1991006187A1 Telephone system used for the distribution of advertising messages |
| 05/02/1991 | EP0425203A2 Virtual private line service |
| 05/02/1991 | EP0425202A2 Control of overload in communications networks |
| 05/02/1991 | EP0425163A2 Customer programmable automated integrated voice/data technique for communication systems |
| 05/02/1991 | EP0425161A2 Customer definable integrated voice/data call transfer technique |
| 05/02/1991 | EP0425146A2 Apparatus for controlling a digital crossconnect system from a switching system |
| 05/02/1991 | EP0425145A2 Method and apparatus for providing real-time switching of high bandwidth transmission channels |
| 05/02/1991 | EP0424877A2 Malicious call detection method and system |
| 05/02/1991 | EP0424495A1 Voice messaging for pay phone telephone systems. |
| 05/02/1991 | EP0270604B1 Message delivery system and method |
| 05/01/1991 | CN2076284U Full-automatic long distance telephone switching system |
| 04/30/1991 | US5012512 Telephone operator and agent to database communication arrangement |
| 04/30/1991 | US5012511 Method of and system for control of special services by remote access |
| 04/30/1991 | US5012510 Dynamic callback technique |
| 04/30/1991 | US5012509 Communication conference apparatus and method for remote conferencing |
| 04/30/1991 | US5012465 Interconnection system for interconnecting connection units and a central switching facility |
| 04/24/1991 | EP0424015A2 Multilocation queuing for telephone calls |
| 04/24/1991 | EP0423773A2 Emergency resumption processing apparatus for an information processing system |
| 04/24/1991 | CN1050960A Device for evaluating and/or regulating throughput of virtual circuits on asynchronous time-division multiplex transmission channel |
| 04/24/1991 | CA2028258A1 Malicious call detection method and system |
| 04/23/1991 | US5010569 Telephone-call distributor |
| 04/23/1991 | US5010317 Satellite based simulcast paging system |
| 04/18/1991 | WO1991005424A1 Method for terminating an isdn line |
| 04/18/1991 | CA2027770A1 Emergency resumption processing apparatus for an information processing system |
| 04/17/1991 | CN1050803A 呼叫分配系统 Call Distribution System |
| 04/17/1991 | CN1012413B Operation mode of crossbar telephone switchboard management system |
| 04/16/1991 | US5008930 Customer definable integrated voice/data call transfer technique |
| 04/16/1991 | US5008926 Message management system |
| 04/16/1991 | US5008884 Private automatic branch exchange system with line accessing number adding feature |
| 04/16/1991 | US5008835 Method and apparatus for storing and forwarding voice signals and generating replies |
| 04/16/1991 | US5008772 Telephone circuit protector module having plural circuit grounding means |
| 04/16/1991 | CA1283195C Frequency-division multiplex broadband multimedia network |
| 04/11/1991 | DE3932689A1 Activating telephone exchange night switch - using central memory to store allocations of switchboard positions to subscribers |
| 04/10/1991 | EP0421912A2 Emergency mobilization system |
| 04/10/1991 | EP0421583A1 Call distribution system |
| 04/09/1991 | US5007078 Automated order entry recording method and apparatus |
| 04/09/1991 | US5007076 Call announcement arrangement |
| 04/09/1991 | US5007049 Electronic exchange having a conference telephone communication function and conference telephone communication method |
| 04/09/1991 | CA1282885C Lpc-based dtmf receiver for secondary signalling |
| 04/09/1991 | CA1282884C Telephone system with stimulus operation or default operation |
| 04/09/1991 | CA1282883C Remote disconnection and short-circuiting apparatus and method |
| 04/07/1991 | CA2027081A1 Call distribution system |
| 04/04/1991 | WO1991004639A1 Digital telecommunications device |
| 04/04/1991 | DE3931776A1 Digitale telekommunikations-vorrichtung Digital telecommunication device |
| 04/03/1991 | EP0420623A2 Communication apparatus and method |
| 04/03/1991 | EP0420528A2 Dynamic transport facility identification |
| 04/03/1991 | EP0420527A2 Electronic messaging systems with additional message storage capability |
| 04/03/1991 | EP0420204A2 Method for the transmission of subscriber data from one secret subscriber to another in communication exchanges |
| 04/03/1991 | EP0419973A2 Method for activating an optical display in a communication terminal of a switching exchange |
| 04/03/1991 | EP0419960A2 Circuit for testing parts of a digital time-multiplexed telecommunications exchange, especially telephone exchange |
| 04/03/1991 | EP0419948A2 Method for initiating switching-related functions and services |
| 04/03/1991 | EP0148836B1 Method and apparatus for sending a data message to a selected station during a silent interval between ringing |
| 04/02/1991 | US5005197 Method and apparatus as for testing a telephone line interface card |
| 04/02/1991 | CA1282481C Communication system dynamic conferencer circuit |
| 04/02/1991 | CA1282480C Automatic speech recognition to select among call destinations |
| 04/02/1991 | CA1282479C Automated operator assistance calls with voice processing |
| 03/27/1991 | EP0418851A2 ISDN D-channel interface |
| 03/27/1991 | EP0418282A1 Portable call generator |
| 03/26/1991 | US5003595 Secure dial access to computer systems |
| 03/26/1991 | US5003593 Teleconferencing method for a secure key management system |
| 03/26/1991 | US5003588 Circuit arrangement for protecting electronic interface circuit of subscriber line circuits |
| 03/26/1991 | US5003587 Telephone on-hold device |
| 03/26/1991 | US5003584 Method and apparatus for the billing of value-added communication calls |
| 03/26/1991 | US5003580 Adapter for interfacing a work station terminal to a key telephone system |
| 03/26/1991 | US5003577 Voice and data interface to a voice-mail service system |
| 03/26/1991 | US5003575 Method and apparatus for storing and forwarding voice signals with controlled access |
| 03/26/1991 | US5003574 Voice capture system |
| 03/26/1991 | US5003573 Self-diagnosis of loop start and ground start trunk interfaces |
| 03/26/1991 | US5003554 Apparatus for the automatic in-circuit testing of coder/decoder telecommunications circuits and method therefor |
| 03/21/1991 | WO1991003900A1 A method and apparatus for processing pages |
| 03/20/1991 | EP0417425A1 Method for transmitting information between several user stations and user station for carrying out the method |
| 03/20/1991 | EP0417336A1 Switching device for broad-band signals |
| 03/20/1991 | CN1050117A Microcomputer-controlled testing instrument for cross-bar switchboard |
| 03/19/1991 | US5001741 Apparatus for testing and sparing linecard equipment in a telecommunications exchange |
| 03/19/1991 | US5001710 Customer programmable automated integrated voice/data technique for communication systems |
| 03/19/1991 | CA1281800C Mass polling system |
| 03/19/1991 | CA1281799C Remote maintenance system for digital communication network |
| 03/19/1991 | CA1281768C Protection arrangements for communications lines |
| 03/13/1991 | EP0416129A1 Switching system for application service |
| 03/13/1991 | EP0211849B1 Pager system and communication protocol |
| 03/12/1991 | US4999731 Surge protector for telecommunications systems |
| 03/12/1991 | CA2024871A1 Broadband signal switching equipment constructed in accordance with field-effect transistor technology |
| 03/12/1991 | CA1281397C Circuit arrangement for telecommunications switching systems, particularly telephone switching systems with information processing switching device and processing load limiting |
| 03/07/1991 | WO1991003115A1 A system and method for forwarding facsimile messages |
| 03/07/1991 | DE4007460A1 Rapid identification of faults and changeover in telephone network - having faults identified by 1 out of N-unit coupled back to switching network |
| 03/06/1991 | CN1011936B Modular structure of integrated service data network communication system of producing and displaying fault literal information |
| 03/05/1991 | US4998273 Telephone line called number recognizer |
| 03/05/1991 | US4998271 Telephone accessory |
| 03/05/1991 | US4998248 Integrated services digital network (ISDN) system and multimedia data connection method in same system |
| 03/05/1991 | US4998243 ISDN terminal adapter with teleconference provision |
| 03/05/1991 | US4998101 Broadband signal switching matrix network |
| 03/05/1991 | US4997387 Main distributing strip for incoming and outgoing electrical lines |
| 03/02/1991 | WO1991003753A1 Optical coupler |
| 02/28/1991 | DE3928007A1 Broker telephone installation using ISDN devices - provides connections to public or private telephone network and direct cross-connections between broker stations |
| 02/27/1991 | EP0414051A2 Circuit arrangement for key-controlled switching devices in communication exchanges, especially telephone exchanges |
| 02/27/1991 | EP0413842A1 Programmable conferencing module for ring arrays and switchable ring array networks |
| 02/27/1991 | CN1049579A Access network for cordless telephone service |