| Patents for H04M 3 - Automatic or semi-automatic exchanges (99,881) |
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| 09/16/1987 | EP0237211A2 Packet buffer memory control for statistical multiplexing |
| 09/16/1987 | EP0236803A1 Method for the operation of a fault-protected and highly available multiprocessor central controller of a switching system |
| 09/16/1987 | EP0236780A1 Method for the operation of an error-protected multiprocessor controller having a high availability to a switching system |
| 09/15/1987 | US4694487 Controlling multi-fort hunt groups in a distributed control switching system |
| 09/15/1987 | US4694483 Computerized system for routing incoming telephone calls to a plurality of agent positions |
| 09/15/1987 | CA1226982A1 Speech synthesized time announcement circuit |
| 09/15/1987 | CA1226926A1 Arrangement for line jumper testing |
| 09/09/1987 | EP0236013A2 Call distribution arrangement |
| 09/08/1987 | US4692918 In a distributed processing system |
| 09/08/1987 | US4692817 Programmed conversation recording system |
| 09/08/1987 | CA1226656A1 Dial-operated pbx exchange |
| 09/07/1987 | EP0125279A4 Acd management information system. |
| 09/02/1987 | EP0234861A2 Packet generation apparatus and method |
| 09/02/1987 | EP0234860A2 Time stamping for packet system nodes |
| 09/02/1987 | EP0234859A2 Time stamp and packet virtual sequence numbering for reconstructing information signals from packets |
| 09/02/1987 | EP0234711A2 Information transmission/processing |
| 09/02/1987 | EP0233902A1 Telephone and demodulator |
| 09/01/1987 | US4691347 Method and apparatus for controlling a conference |
| 09/01/1987 | US4691346 PBX integrity arrangement for maintaining the functional integrity of PBX communication devices and associated facilities |
| 09/01/1987 | US4691337 Method and apparatus for determining the value of analog voltages occurring on telephone subscriber lines of a digital telephone exchange |
| 09/01/1987 | US4691336 Telephone test set having an auxiliary amplifier and speaker for permitting listening to line signals |
| 09/01/1987 | CA1226358A1 Arrangement for loop analysis testing for a digital switching system |
| 08/27/1987 | DE3605754A1 Method for checking the functional capacity of telephone subscriber connection circuits |
| 08/25/1987 | US4689815 Controlling multi-port hunt groups in a distributed control switching system |
| 08/25/1987 | US4689783 Digital satellite exchange |
| 08/20/1987 | DE3605171A1 Test method for telephone subscriber connection circuits |
| 08/18/1987 | US4688209 Method and apparatus for looping around a digital transmission line at a channel unit |
| 08/18/1987 | US4688208 Time division exchange for carrying out a loop-back test |
| 08/18/1987 | CA1225759A1 Remotely controlled telephone hold program system |
| 08/18/1987 | CA1225727A1 Multifrequency tone distribution using a conferencing arrangement |
| 08/18/1987 | CA1225726A1 Method and apparatus for displaying at a selected station special service information during a silent interval between ringing |
| 08/13/1987 | WO1987004884A1 Pay-per-view catv system |
| 08/12/1987 | EP0231809A2 Method for integration of one or more supplementary-function modules in telephone exchanges and also access circuit for realisation of the method |
| 08/12/1987 | EP0231466A1 Device for the indication of looping in the ringing phase |
| 08/11/1987 | US4686701 Processing sequence calls in a distributed control switching system |
| 08/11/1987 | US4686700 Telephone off-hook detector circuit |
| 08/11/1987 | US4686699 Call progress monitor for a computer telephone interface |
| 08/11/1987 | US4686698 Workstation for interfacing with a video conferencing network |
| 08/11/1987 | US4686696 Transmission line signal sensing circuit employing means for conserving power, especially for use with a telephone disconnect circuit, and associated method |
| 08/11/1987 | US4686512 Integrated digital circuit for processing speech signal |
| 08/05/1987 | EP0231015A1 Coherent photonic telecommunication device |
| 08/05/1987 | CN86108619A Telecommunications network and method |
| 08/04/1987 | US4685122 Interface circuit for remote control of a PABX |
| 08/04/1987 | US4685120 Electronic trigger switch for maintenance termination unit |
| 08/04/1987 | US4685102 Switching system loopback test circuit |
| 08/04/1987 | CA1225157A1 Signal recognition system |
| 07/22/1987 | EP0229494A1 Telecommunications network and method |
| 07/22/1987 | EP0229378A2 Communication system having automatic circuit board initialization capability |
| 07/22/1987 | EP0229170A1 Statistical analysis system and method for use with public communication facility. |
| 07/21/1987 | US4682354 Automatic call coverage for unattended PBX stations |
| 07/21/1987 | US4682349 Switching system with video switching matrix |
| 07/21/1987 | US4682347 Telephone line selection and isolation method and apparatus |
| 07/21/1987 | US4682346 Telephone test set |
| 07/21/1987 | US4682345 Adapter for coupling together two subscribers' lines to a telephone test set |
| 07/16/1987 | WO1987004308A1 Direct access test unit for central office |
| 07/14/1987 | US4680785 Personal-signaling communication system |
| 07/14/1987 | US4680784 Traffic simulator for testing exchanges taking the subscriber-system interaction into account |
| 07/14/1987 | CA1224285A1 Optical main distributor |
| 07/08/1987 | EP0228053A2 Control of real-time systems utilizing a nonprocedural language |
| 07/08/1987 | EP0228048A2 Customer programmable real-time system |
| 07/07/1987 | US4679228 Speakerphone sensing circuit |
| 07/07/1987 | US4679224 Telephone line testing circuit |
| 07/07/1987 | US4679187 Adaptive trunk-compression system with constant grade of service |
| 07/07/1987 | CA1223985A1 Apparatus and method for checking time slot integrity of a switching system |
| 07/07/1987 | CA1223945A1 Automated system for establishing telephone voice connections |
| 07/01/1987 | EP0227327A2 Communication systems and terminals therefor |
| 07/01/1987 | EP0227186A2 Circuit arrangement for the evaluation of the output signals of current detectors in telecommunication systems |
| 06/30/1987 | US4677665 Method and apparatus for electronically detecting speech and tone |
| 06/30/1987 | US4677664 Method and apparatus for an improved ring trip detection telephone circuit |
| 06/30/1987 | US4677663 Telephone answering and call forwarding improvement |
| 06/30/1987 | US4677662 Multiple line self-contained telephone |
| 06/30/1987 | US4677661 Microprocessor controlled telephone unit |
| 06/30/1987 | US4677659 Telephonic data access and transmission system |
| 06/30/1987 | US4677610 Three-port conference circuit for use in a digital telephone system |
| 06/30/1987 | US4677609 Semi-automated directory assistance systems |
| 06/24/1987 | CN85108929A Automatic separator for subscribers in megnetotelephon party-line system |
| 06/23/1987 | US4675899 Frequency ring director |
| 06/23/1987 | US4675895 Test adapter tools for telephone cutover system |
| 06/23/1987 | US4675863 Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels |
| 06/23/1987 | US4675862 For use with a digital transmission line |
| 06/23/1987 | CA1223324A1 Conference bridge |
| 06/18/1987 | WO1987003763A1 Routing of network traffic |
| 06/16/1987 | US4674118 Telephone line hold and hold release apparatus |
| 06/16/1987 | US4674117 Subscriber line circuit having an improved offhook supervision circuit |
| 06/16/1987 | US4674116 Telephone line concentrator without switching matrix |
| 06/16/1987 | EP0225714A1 Communications network |
| 06/16/1987 | CA1223096A1 Message retrieval system |
| 06/10/1987 | EP0225084A2 Line Access apparatus |
| 06/10/1987 | EP0225083A2 Line access apparatus for in-band communication |
| 06/10/1987 | EP0224645A2 Electronic trigger switch for maintenance termination unit |
| 06/09/1987 | US4672662 Switching system and method for network having a plurality of terminal control equipment units |
| 06/04/1987 | WO1987003440A1 Interface circuit |
| 06/04/1987 | DE3542029A1 Circuit arrangement for evaluating mutually independent signals which occur on separate line wires |
| 06/03/1987 | EP0224212A2 Dial tone detection arrangement with a detection notification feature |
| 06/03/1987 | CN85108555A Method of automatic switchover for subscriber's extension |
| 06/02/1987 | US4670900 Single line telephone call forwarding device |
| 06/02/1987 | US4670898 Direct access test unit for central office |
| 06/02/1987 | US4670628 Reprogrammable call forwarding device |
| 06/02/1987 | CA1222586A1 Personal-servicing communication system |
| 05/27/1987 | EP0223546A2 Telephone line access apparatus |