| Patents for H04M 3 - Automatic or semi-automatic exchanges (99,881) |
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| 02/26/1991 | WO1991003137A1 Call completion system |
| 02/26/1991 | US4996705 Telemarketing |
| 02/26/1991 | US4996704 Electronic messaging systems with additional message storage capability |
| 02/26/1991 | US4996702 Apparatus for testing spare line circuits in a communication system |
| 02/26/1991 | US4996695 Arrangement for accessing and testing telecommunication circuits |
| 02/21/1991 | WO1991002423A1 Cable pair tester |
| 02/21/1991 | WO1991002422A1 Electronic apparatus for ''hands off'' control of a voice mail system |
| 02/20/1991 | EP0413490A2 Resource allocation scheme |
| 02/20/1991 | EP0413369A1 A portable pager |
| 02/19/1991 | US4995074 Switched line modem interface system |
| 02/19/1991 | US4995071 Video conference installation |
| 02/19/1991 | US4995034 Method of integrating one or more accessory function modules in telecommunications systems and access circuit for use therewith |
| 02/19/1991 | US4995033 Digital private branch exchange and method of manufacturing same |
| 02/14/1991 | DE3926305A1 Transfer device for several mobile subscribers - interrogates electronic back call memory in given time periods in response to stored back call requirements |
| 02/13/1991 | EP0412799A2 Telephone communication system |
| 02/13/1991 | EP0412693A2 Dynamic graphics arrangement for displaying spatial-time-series data |
| 02/13/1991 | EP0412692A1 Dynamic graphical analysis of network data |
| 02/13/1991 | EP0412574A2 Antenna for watch pager system |
| 02/13/1991 | CN1011653B Battery feed circuit |
| 02/13/1991 | CN1011652B Protection arrangement for telephone subscriber line interface circuit |
| 02/12/1991 | US4993062 Telephone control system including stored blocked and allowed telephone numbers |
| 02/12/1991 | US4993014 Communications |
| 02/12/1991 | CA1280194C Paging system for electronic telephone apparatus |
| 02/06/1991 | EP0411798A2 End-to-end network surveillance |
| 02/06/1991 | EP0411796A2 Semi-automated operator assistance telecommunication calls |
| 02/06/1991 | EP0411528A1 Security device for telephone installation with music on hold |
| 02/06/1991 | EP0411378A2 Method for generating a signal for setting certain states in a secondary control circuit of an analogue telephone set |
| 02/06/1991 | EP0411037A1 Voice-operated service. |
| 02/05/1991 | US4991203 Line switching apparatus and method |
| 02/05/1991 | US4991196 Testing communications systems |
| 02/05/1991 | US4991195 Apparatus and method for testing a telephone circuit protector |
| 02/05/1991 | US4991105 Microprocessor controlled ground system monitor |
| 02/05/1991 | US4991051 Protection arrangements for communications lines |
| 01/31/1991 | DE3925497A1 Second branch office equipment with control sequence memory - in which procedural information is addressed according to signal combination with different equipment and function criteria |
| 01/30/1991 | EP0410698A2 Hands-free telephone |
| 01/30/1991 | EP0410657A2 Apparatus and method for processing a freephone number telephone call |
| 01/30/1991 | EP0410251A1 Access network for wireless telephone service |
| 01/30/1991 | CN2070518U Automatic long-distance telephone management device |
| 01/29/1991 | US4989235 Integrated communication system for ensuring effective use of channels |
| 01/29/1991 | US4989234 Systems for capturing telephonic mass responses |
| 01/29/1991 | US4989233 Systems for capturing telephonic mass responses |
| 01/29/1991 | US4989230 Cellular cordless telephone |
| 01/29/1991 | US4988209 Telephone agent management information system |
| 01/29/1991 | CA1279717C Communication facilities access control arrangement |
| 01/24/1991 | DE3922804A1 Transmission of telephone cable parameters over lines - converts cable measured value into analog frequency within range below speech frequency |
| 01/23/1991 | EP0409417A1 A pay telephone system |
| 01/23/1991 | EP0408797A1 Coupling device for broadband signals |
| 01/23/1991 | EP0235231B1 Subscriber line card arrangement |
| 01/23/1991 | EP0144344B1 Ringing signal generator |
| 01/22/1991 | US4987591 Electronic telephone apparatus able to supply sync clock signals reliably, and method of controlling the supply of sync clock signals |
| 01/22/1991 | US4987590 Multiple party telephone control system |
| 01/22/1991 | US4987587 Method and apparatus for providing 800 number service |
| 01/22/1991 | US4987573 Telephone system digital channel bank interface |
| 01/22/1991 | US4987492 User interface control for communication system |
| 01/22/1991 | CA1279393C Digital signal processing system |
| 01/21/1991 | CA2021468A1 Broadband signal switching network |
| 01/17/1991 | DE3930278C1 Establishing stereo telephone connection - using integrated digital communication system for coualing two useful data channels and signalling channel |
| 01/16/1991 | EP0408086A2 Watch pager system |
| 01/15/1991 | US4985917 Personal artificial loop (p.a.l.) |
| 01/15/1991 | US4985915 Method for interfacing between a key-phone system and a key-phone subscriber |
| 01/15/1991 | US4985914 Voice storage/retrieval system with memory address generator successively initialized with start-point addresses |
| 01/15/1991 | US4985891 ISDN system having subscriber line multiplexer with means for establishing different data links through D-channels on subscriber line and high rate transmission line |
| 01/15/1991 | CA1279134C Communications network and method with visible and voice message transmission capabilities |
| 01/10/1991 | WO1991000664A1 Personal communication system |
| 01/09/1991 | EP0407048A2 A dual channel A/D and D/A converter |
| 01/09/1991 | CN1048475A Computer-aided heavy traffic testing device |
| 01/08/1991 | US4984266 Subscriber line card arrangement |
| 01/08/1991 | US4984263 Key-phone system |
| 01/08/1991 | US4984262 Telephone network |
| 01/08/1991 | US4984250 DC termination circuit for subscriber cables |
| 01/02/1991 | EP0405830A2 Fully shared communications network |
| 01/02/1991 | EP0405029A1 Speech communication system and method |
| 01/02/1991 | CN1048293A Video text communication card |
| 01/02/1991 | CN1011110B Emergency d.c. power supply with emergency state being indicated by polarity reversal |
| 01/01/1991 | US4982426 Telecommunications line interface circuits |
| 01/01/1991 | US4982421 Virtual private line service |
| 01/01/1991 | US4982420 Recording system with response categorization |
| 01/01/1991 | US4982325 Applications processor module for interfacing to a database system |
| 01/01/1991 | US4982307 Thermal protection circuit for an integrated circuit subscriber line interface |
| 12/27/1990 | EP0404451A2 System utilizing a portable device for generating a telephone call |
| 12/27/1990 | EP0404000A1 Vocal message equipment for switching exchange |
| 12/27/1990 | EP0403864A2 Distribution block for telecommunication exchanges with break contacts |
| 12/27/1990 | EP0248035B1 Telephone subscriber loop overvoltage protection integrated circuit |
| 12/25/1990 | US4980908 Voice-switched gain control for voice communication equipment connected to telephone lines |
| 12/25/1990 | US4980906 Switch-adjunct interface |
| 12/20/1990 | CA2019309A1 Autoswitch voice messaging equipment |
| 12/19/1990 | EP0403451A1 A method and arrangement for detecting and localizing errors or faults in a multi-plane unit incorporated in a digital time switch |
| 12/19/1990 | EP0402853A2 Private branch exchange system with attendant console |
| 12/19/1990 | EP0402658A2 Terminal distribution block for incoming and outgoing electrical lines |
| 12/19/1990 | EP0402360A1 Impedance synthesis multiple loop using filtering means. |
| 12/19/1990 | EP0210221B1 Integrated message service system |
| 12/19/1990 | EP0138951B1 A self routing steering network |
| 12/18/1990 | US4979206 In common carrier telecommunications switching network |
| 12/18/1990 | US4979118 Predictive access-control and routing system for integrated services telecommunication networks |
| 12/18/1990 | CA1278122C Message transferring telephone set and method |
| 12/18/1990 | CA1278121C Data communication system |
| 12/18/1990 | CA1278116C Diagnostic method of equipment and system using the same |
| 12/17/1990 | WO1990016132A1 A method and arrangement for detecting and localizing errors of faults in a multi-plane unit incorporated in a digital time switch |
| 12/16/1990 | WO1990016136A1 Polyphonic coding |
| 12/12/1990 | EP0402083A2 Teleconferencing method for a secure key management system |