Patents
Sitemap › H04 - Electric communication technique › H04M - Telephonic communication › H04M 3 - Automatic or semi-automatic exchanges
Patents for H04M 3 - Automatic or semi-automatic exchanges (99,881)
09/1990
09/13/1990DE3907237A1 Device for the simulation, analysis and monitoring of ISDN terminals operating according to the ISDN system
09/12/1990EP0386958A1 Dual rail dilated switching networks
09/12/1990EP0386607A2 A predictive access-controll and routing system for integrated services telecommunication networks
09/12/1990EP0386369A2 Apparatus for testing and sparing linecard equipment in a telecommunications exchange
09/12/1990EP0385986A1 Method of processing calls.
09/11/1990US4956861 Method and apparatus for addressee location
09/05/1990EP0385804A2 Network termination equipment
09/05/1990EP0385670A2 Spontaneous voice and data messaging
09/05/1990EP0385270A2 Surge protector
09/05/1990EP0359757A4 Automated interactive mass communications system
09/04/1990US4955054 Integrated telecommunication system with improved digital voice response
09/04/1990US4955047 Automated attendant with direct inward system access
09/01/1990CA2011170A1 Surge protector
08/1990
08/29/1990EP0384765A1 Communications link testing
08/29/1990EP0384025A2 Method for answering calls in communication exchanges with operator positions
08/29/1990EP0384024A1 Process for categorising and registering information arising from telephone connections
08/29/1990EP0383790A1 Telephone line communications control system
08/29/1990EP0247118B1 Interface circuit
08/28/1990US4953204 Multilocation queuing for telephone calls
08/28/1990US4953203 High capacity information forwarding system
08/28/1990US4953200 Private branch exchange capable of discriminating different types of telephone sets connected thereto
08/28/1990US4953195 Private branch exchange system with specific information transmitting function
08/28/1990US4953194 Automated documentation system for a communications network
08/28/1990US4953159 Arrangements for processing different categories of messages
08/23/1990DE4005365A1 Speech control system for communication device
08/21/1990US4951310 Automatic call distribution system
08/21/1990CA1273134A1 Telephone signal transmission device
08/21/1990CA1273089A1 Toll fraud control
08/21/1990CA1273088A1 Toll fraud control override
08/16/1990EP0382670A2 Voice applications generator
08/16/1990EP0382646A1 Emulators of a digital network terminal and bus test and measurement systems
08/16/1990EP0382431A1 Communications network
08/16/1990EP0382212A2 Multi-media information service center and multi-media communication system
08/16/1990EP0382091A2 Entrance distributor for private branch exchanges
08/14/1990US4949373 Method of coordinating the transfer of a phone call
08/14/1990US4949355 Test access system for a digital loop carrier system
08/14/1990US4949086 Broadband signal switching equipment
08/09/1990WO1990009725A1 Communications network
08/08/1990EP0381104A1 Device for the connection of a central connection chain to connection units
08/08/1990EP0380946A2 Method for the control of the regulation ability of a phase-locked loop circuit
08/08/1990EP0380798A2 Method for the representation of call data in a telephone exchange
08/08/1990CN1044562A Microcomputer control system used in automatic trunk service
08/07/1990US4947427 Protection arrangement for a telephone subscriber line interface circuit
08/07/1990US4947421 Call waiting arrangement providing options to both a subsequent calling party and to the called party
08/07/1990CA1272520A1 Security arrangement for a telecommunications exchange system
08/02/1990CA2009105A1 Arrangement for linking a central connection chain to connection units
08/01/1990EP0380315A2 TV phone communication system and apparatus therefor
08/01/1990EP0380191A2 Method and apparatus for altering the access format of telephone calls
08/01/1990EP0380189A2 Method and apparatus for performing an automated collect call
08/01/1990EP0380164A1 Circuit arrangement for establishing conference connections on a loop
07/1990
07/31/1990US4945555 Method and means for remote testing of unused telephone lines
07/31/1990US4945554 Test circuit arrangement for computer-controlled communications switching systems
07/31/1990US4945534 Programmable conferencing module for ring arrays and switchable ring array networks
07/31/1990US4945533 Method and apparatus for transmitting data
07/26/1990DE3901793A1 Method for handling connections in communications switching systems in an integrated services network (ISDN)
07/25/1990EP0378694A1 Response control system
07/25/1990EP0195786B1 Telephone switching system adjunct call processing arrangement
07/25/1990CN1044198A Circuit for center controlling telecommunications exchange apparatus, particularly, pcm telephone exchange apparatus, with center conneting members and thereof connect with subconnecting members
07/25/1990CN1008962B Subscriber rf telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of rf channels
07/24/1990US4944004 Interface circuit with transient event tolerance
07/24/1990US4943998 Intermeshed communication network
07/24/1990US4943996 Shared access to voice and information
07/24/1990US4943995 Semi-automated customer information system
07/24/1990US4943993 Cable pair tester
07/23/1990CA2007839A1 Method and apparatus for performing an automated collect call
07/20/1990WO1990008441A1 Earth detecting circuit
07/18/1990CN1044020A Speech sound input telephone automatic directory inquiries system
07/18/1990CN1008875B Control system for interunit communication
07/18/1990CN1008871B Bus-type master-slave mutual-call inter-com
07/17/1990US4942602 Coordinated transfer of voice and information through a network of digital switches
07/17/1990US4942601 Method of making a call reservation and sending an interrupt tone in a private branch exchange (PBX)
07/17/1990CA1271827A1 Announcing waiting times in queueing systems
07/13/1990CA2007673A1 Voice storage/retrieval system with memory address generator successively initialized with start-point addresses
07/12/1990WO1990007834A1 Impedance synthesis multiple loop using filtering means
07/11/1990EP0377395A2 Host load balancing
07/11/1990EP0377394A2 Coordinated transfer of voice and information through a network of digital switches
07/11/1990EP0377392A2 Method for conferencing a phone call and terminal displayed information associated with it
07/10/1990US4941168 System for the recognition of automated telephone answering devices and delivery of prerecorded messages to such devices
07/10/1990US4941167 Telephone system with customized central message center
07/10/1990US4941063 Telephone lines overvoltage protection apparatus
07/10/1990CA1271574A1 Cordless telephone system
07/04/1990EP0376587A2 Acoustic calibration arrangement for a voice switched speakerphone
07/04/1990EP0376556A2 Real-time network routing
07/04/1990EP0376545A2 Automated message retrieval system
07/04/1990EP0376544A2 Path allocation arrangement for multi-terminal groups
07/04/1990EP0376527A2 Remote agent operation for automatic call distributors
07/04/1990EP0376526A2 Telephone agent management information system
07/04/1990EP0376525A2 Automated call handling apparatus
07/04/1990EP0376517A2 Telephone agent call management system
07/04/1990CN1008680B System for interfacing a standard telephone set with a radio transceiver
07/03/1990US4939776 Logic signal circuit for a releasing relay
07/03/1990US4939773 Multiple party telephone control system
07/03/1990US4939771 Attendant-controlled call message delivery system and method
07/03/1990US4939765 Interlock circuit for preventing corruption of telephone line signals
06/1990
06/28/1990WO1990007213A1 A protection circuit
06/28/1990DE3842936A1 Subscriber terminal with time display
06/27/1990EP0375250A2 Electronic ringing signal generator
06/27/1990EP0375119A2 Improved method and apparatus for customer account servicing
06/27/1990EP0374943A2 Communication conference system
06/27/1990EP0214179B1 Processing sequence calls in a distributed control switching system
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