| Patents for H04M 3 - Automatic or semi-automatic exchanges (99,881) |
|---|
| 06/01/1988 | EP0268667A1 A telephone line monitoring system. |
| 06/01/1988 | DE3634783C1 Operator's or enquiry station for a telephone switching system, particularly a multiple broker's facility |
| 06/01/1988 | DE3634781C1 Circuit arrangement for monitoring connections which are on hold in telephone switching systems constructed as multiple broker's facilities |
| 05/31/1988 | US4748681 Integrated-services radio transmission system |
| 05/31/1988 | US4748660 Process for determination of the last intermediate node in a network of numerous interconnected nodes |
| 05/31/1988 | US4748657 Handset actuated signal intercept |
| 05/31/1988 | US4748653 Toll fraud control override |
| 05/31/1988 | US4748652 Circuit for detecting abnormality in feeder |
| 05/31/1988 | US4748651 Multiline transmission line test receptacle with provision for testing each line |
| 05/31/1988 | US4748620 Time stamp and packet virtual sequence numbering for reconstructing information signals from packets |
| 05/25/1988 | EP0164362B1 Method for customer definable telephone capability |
| 05/24/1988 | US4747128 Telephone privacy protector |
| 05/24/1988 | US4747127 Telecommunication switching system |
| 05/24/1988 | US4747126 Voice mail system on magnetic tape |
| 05/24/1988 | US4747125 Programmed conversation recording system with variable patience interval |
| 05/24/1988 | US4747124 PBX telephone call control system |
| 05/24/1988 | US4746921 Broadband signal space switching apparatus |
| 05/24/1988 | US4746855 Relay multiplexing for circuit testers |
| 05/24/1988 | CA1237210A1 Multiple line self-contained telephone |
| 05/24/1988 | CA1237208A1 Mechanized loop testing using a local metallic access port |
| 05/18/1988 | EP0267808A2 Telephone circuit for supplying ringing signals to a subscriber telephone line and for detecting unhooking |
| 05/18/1988 | EP0157819B1 Multi-processing stored program controlled telecommunication establishment |
| 05/18/1988 | CN87106044A Security arrangement for telecommunications exchange system |
| 05/17/1988 | US4745592 Coherent photonic telecommunications system |
| 05/17/1988 | CA1236943A1 Method and apparatus for controlling digital voice recording and playback over telephone lines and adapted for use with standard host computers |
| 05/17/1988 | CA1236906A1 Conference circuits and methods of operating them |
| 05/17/1988 | CA1236882A1 Method of detecting hazardous line voltages over a two-wire line |
| 05/11/1988 | CN87204085U Simple telephone exchanger |
| 05/11/1988 | CN87105157A Pabx-networking |
| 05/10/1988 | US4744028 Methods and apparatus for efficient resource allocation |
| 05/04/1988 | EP0265944A2 Cordless telephone system |
| 05/04/1988 | EP0265837A2 Circuit arrangement, its application and testing method for a message communication network |
| 05/04/1988 | EP0265817A1 Method for traffic load control for telecommunication exchanges, in particular telephone exchanger equipped with control processors and traffic overload limitation |
| 05/04/1988 | CN87106171A Circuit protector of communication line |
| 05/03/1988 | US4742539 Telephone loop current modulator |
| 05/03/1988 | US4742538 Current source and off-hook detector |
| 05/03/1988 | US4742537 Telephone line monitoring system |
| 05/03/1988 | US4741711 Modular distribution frame including protector modules adapted for break access testing |
| 04/28/1988 | DE3636529A1 Circuit arrangement for telecommunications systems, in particular telephone switching systems, in which switching operations are statistically evaluated |
| 04/27/1988 | EP0264644A2 Circuit arrangement for simulating the NSI contact by means of the hold circuit in a two-way telephone set |
| 04/27/1988 | EP0264365A1 Remotely controlled telephone hold program system |
| 04/26/1988 | US4741028 Method of randomizing telephone numbers |
| 04/26/1988 | US4741026 Message signaling arrangement between a switching system and user terminals |
| 04/26/1988 | US4741025 Speech additive distribution equipment for conferencing system |
| 04/26/1988 | US4741017 Apparatus and method for identifying and analyzing telephone channel units, commands and responses |
| 04/26/1988 | US4741016 Special service signal tester |
| 04/26/1988 | US4740788 Method of providing location dependent visitor dispatching service |
| 04/26/1988 | CA1235828A1 Time division exchange for carrying out a loop-back test |
| 04/26/1988 | CA1235783A1 Voice integrated presentation system |
| 04/21/1988 | WO1988002966A1 Automatic voice processing assisted customer information system |
| 04/21/1988 | WO1988002965A1 Directory assistance call processing and non-supervisory signal monitoring arrangements |
| 04/20/1988 | EP0264092A2 Telephone system |
| 04/20/1988 | EP0264046A1 Switching device for broad-band signals |
| 04/20/1988 | EP0264006A1 Communication system with special communication services which can be activated by programme submodules of a system control programme |
| 04/20/1988 | EP0263972A2 Electronic hold circuit for a two-way telephone set fed by the subscriber line |
| 04/20/1988 | EP0150181B1 Method and apparatus for displaying at a selected station special service information during a silent interval between ringing |
| 04/19/1988 | US4739509 Automated message chronicling system |
| 04/19/1988 | CA1235541A1 Method and apparatus for operating on companded pcm voice data |
| 04/19/1988 | CA1235540A1 Method and apparatus for accessing communication systems |
| 04/19/1988 | CA1235468A1 Process for the determination of the ultimate intermediate node in a system comprised of several interconnected modes |
| 04/13/1988 | EP0263563A2 Time division multiplex exchange |
| 04/13/1988 | EP0263551A1 Method of overload control for the central of a telecommunication system and arrangement for implementing the method |
| 04/13/1988 | EP0263420A2 Apparatus for testing electrical conductors in distribution frames for telecommunication exchanges |
| 04/12/1988 | US4737986 Subscriber's line closing circuit |
| 04/12/1988 | US4737983 Automatic call distributor telephone service |
| 04/12/1988 | US4737982 Reprogrammable call forwarding device |
| 04/12/1988 | US4737951 Exchange with error correction |
| 04/12/1988 | US4737950 Multifunction bus to user device interface circuit |
| 04/12/1988 | CA1235218A1 Automatic call transfer system capable of carrying out call transfer without manual operation |
| 04/07/1988 | DE3633186A1 Method for dialling control in computer-controlled communications branch exchanges |
| 04/06/1988 | EP0262860A2 Digital signal analysis by transformation to vector domain |
| 04/06/1988 | EP0262803A2 Howler indicator in cordless telephone system |
| 04/06/1988 | EP0262709A1 Telecommunication system including a central back-up memory |
| 04/06/1988 | EP0262479A1 Switching device for broad-band signals |
| 04/06/1988 | EP0262331A2 Method of discrimination of input data for a processor-controlled telephone exchange, especially a private telephone exchange with alpha-numerically split input organs in the topical terminals |
| 04/06/1988 | CN87211484U Monitor system of wire communication network |
| 04/05/1988 | US4736444 Pay telephone monitoring system |
| 04/05/1988 | US4736412 Method of and circuit arrangement for evaluating the output signals of current flow detectors in telecommunication facilities |
| 04/05/1988 | US4736409 Control data transmission system for private branch exchange |
| 04/05/1988 | US4736407 Computer assisted graphic teleconferencing method and apparatus |
| 04/05/1988 | US4736405 Communication system with operation-procedure guiding function by speech |
| 04/05/1988 | US4736402 Signaling arrangement |
| 04/05/1988 | US4736362 Programmable data-routing multiplexer |
| 04/05/1988 | CA1234940A1 Multi-line telephone control system |
| 04/05/1988 | CA1234904A1 Communication system for videoconferencing |
| 03/31/1988 | DE3633477A1 Method for testing modular switching systems |
| 03/31/1988 | DE3632827A1 Method for operating a telecommunication system with a network of hierarchically structured exchanges |
| 03/30/1988 | EP0261790A2 Integrated switching system and announcement circuit |
| 03/30/1988 | EP0261483A1 Arrangement for putting through audio signals |
| 03/30/1988 | EP0261352A2 Cross point switch architecture for a micro-PBX |
| 03/30/1988 | EP0161253B1 Interface channel unit |
| 03/30/1988 | EP0109431B1 Combined handset and headset arrangement |
| 03/30/1988 | CN87106170A Telecommunication network including central back-up memory |
| 03/29/1988 | US4734937 Telephone installation |
| 03/29/1988 | US4734936 Ringing signal sending-out circuit |
| 03/29/1988 | US4734935 Communication system with remotely controllable signal receiving means |
| 03/29/1988 | US4734934 Binaural teleconferencing system |
| 03/29/1988 | US4734933 Telephone line status circuit |
| 03/29/1988 | US4734931 In a business communication system |
| 03/29/1988 | US4734930 Voice recording apparatus |