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)
05/1989
05/09/1989US4829563 Method for predictive dialing
05/09/1989US4829514 Digital voice recording and reproduction and telephone network signalling using direct storage in RAM of PCM encoded data
05/09/1989US4829513 Time slot summation communication system for allowing conference calls
05/09/1989CA1253988A1 Answer supervision with automatic voice sensitivity and cadence history
05/09/1989CA1253986A1 Control of a real-time system utilizing a non- procedural language
05/09/1989CA1253985A1 Voice mail system on audio tape
05/09/1989CA1253939A1 Graphics based call management
05/09/1989CA1253938A1 Arrangement for path selection in a communications network
05/09/1989CA1253937A1 Held party notification feature
05/09/1989CA1253936A1 Digital network system having arrangement for testing digital subscriber line
05/03/1989EP0314375A2 Telecommunications wiring test apparatus and method
05/03/1989EP0313562A1 Telephone on-hold device.
05/02/1989US4827518 Speaker verification system using integrated circuit cards
05/02/1989US4827500 Automatic speech recognition to select among call destinations
05/02/1989US4827497 Electronic trigger switch for maintenance termination unit
05/02/1989US4827085 Voice and image teleconferencing system including paperless facsimile means
05/02/1989CA1253600A1 Controlling multi-port hunt groups in a distributed control switching system
05/02/1989CA1253599A1 Methods and apparatus for efficient resource allocation
04/1989
04/26/1989EP0312828A1 Circuit arrangement for routinely testing the timing distribution of a plurality of units operated with the same timing
04/26/1989CN1032610A Apparatus for connecting and disconnecting a ringing signal to a called subscriber
04/25/1989US4825466 Telephone interface security device
04/25/1989US4825460 Line interface unit for caller-controlled receipt and delivery of voice messages
04/25/1989US4825458 Subscriber telephone equipment test apparatus
04/25/1989US4825433 Digital bridge for a time slot interchange digital switched matrix
04/25/1989US4825349 Emergency D.C. power supply with the emergency state being indicated by polarity reversal
04/25/1989US4825195 Method of monitoring to anticipate the triggering of an alarm
04/25/1989US4825130 Dispatch board system
04/25/1989CA1253242A1 Routing of network traffic
04/25/1989CA1253241A1 Automatic call distributor telephone service
04/20/1989WO1989003625A1 Apparatus for connecting and disconnecting a ringing signal to a called subscriber
04/20/1989WO1989003622A1 Direct access test unit for central office
04/19/1989EP0311966A2 Subscriber-concentrated communication system
04/19/1989EP0311754A2 Hands off speech conferencing device
04/18/1989US4823374 Telephone exchange system with performance features activatable from an authorized subscriber station
04/18/1989US4823343 Diagnostic system for remote computers
04/18/1989CA1252927A1 Ringing application circuit
04/18/1989CA1252871A1 Agent communication arrangements for telecommunication systems
04/18/1989CA1252869A1 Operator communication arrangements for operator assistance systems
04/18/1989CA1252868A1 Interface unit for transferring voice and data signals
04/18/1989CA1252864A1 Discretionary call forwarding
04/18/1989CA1252862A1 Semi-automated directory assistance systems
04/18/1989CA1252861A1 Method and apparatus for disallowing the extension of a call through a network
04/18/1989CA1252860A1 Pre-cutover verification of switching system subscriber lines served via digital carrier facilities
04/13/1989DE3733085A1 Process and arrangement for storing appointment information in memory devices of a telecommunication private branch exchange
04/12/1989EP0311580A1 Apparatus for connecting and disconnecting a ringing signal to a called subscriber
04/12/1989EP0311416A2 Translating communication system having central translating apparatus
04/12/1989EP0311271A2 Automated matrix for comunication line connections
04/12/1989EP0310785A2 Expert system for processing errors in a multiplex communication system
04/12/1989EP0310782A2 Failing resource manager in a multiplex communication system
04/12/1989EP0310781A2 Threshold alarms for processing errors in a multiplex communications system
04/11/1989US4821316 Key telephone system
04/11/1989US4821315 Electronic contacts and associated devices
04/11/1989US4821314 Message and ringing signaling device for a telephone installation
04/11/1989US4821308 Telephone answering system with paging function
04/11/1989US4821256 Method for monitoring information transmission in connected through four-wire connecting paths, more particularly semipermanently connected through connecting paths in digital time multiplex exchanges
04/11/1989CA1252548A1 Meet-me conference with control capabilities
04/11/1989CA1252547A1 Interactive facility control arrangement
04/11/1989CA1252510A1 Electronic contacts and associated devices
04/06/1989WO1989003146A1 Telephone line communications control system
04/06/1989DE3732832A1 Process and arrangement for storing telecommunication messages
04/06/1989DE3732823A1 Process for a modularly structured digital communication system with a number of different terminals
04/06/1989DE3732461A1 Process and arrangement for storing telephone messages
04/06/1989DE3732072A1 Process and arrangement for storing telephone messages
04/06/1989DE3732071A1 Process and arrangement for controlling a telephone private branch exchange
04/05/1989EP0309993A2 Multimedia mail system
04/05/1989EP0309851A2 Procedure for connecting two terminals at the instigation of a third in a digital communiation system
04/04/1989US4819235 Modem use monitor
04/04/1989CA1252210A1 Method and apparatus for generating computer- controlled interactive voice services
04/04/1989CA1252186A1 Integrated network controller for a dynamic nonhierarchical routing switching network
04/04/1989CA1252185A1 Pbx intercept and caller interactive attendant bypass system
03/1989
03/30/1989DE3731340A1 Circuit arrangement to test statically and dynamically running switching processes within digital communication systems
03/28/1989US4817204 Optical communication apparatus and method for telephone supervisory and audio signals
03/28/1989US4817137 Apparatus for remotely determining hook status conditions
03/28/1989US4817134 Automated matrix for communication line connections
03/28/1989US4817130 Call management system with protocol converter and port controller
03/28/1989US4817129 Method of and means for accessing computerized data bases utilizing a touch-tone telephone instrument
03/28/1989US4817092 Threshold alarms for processing errors in a multiplex communications system
03/28/1989US4817089 Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels
03/28/1989US4817086 Communication system
03/28/1989CA1251844A1 Telecommunication system, in particular telephone system
03/22/1989EP0308301A1 Telephone device with a radio connection
03/21/1989US4815132 Stereophonic voice signal transmission system
03/21/1989US4815127 Communication system using unbalanced communication paths
03/21/1989US4815120 Computerized telephone monitoring system
03/21/1989US4815119 Testing transmission links
03/21/1989CA1251587A1 Ringing signal reformatting circuit
03/21/1989CA1251584A1 Digital signal cross-connection system
03/15/1989EP0306633A2 Method for the insertion of audible tones in existing voice connections in a telephone exchange
03/14/1989US4813070 Telephone intercept system
03/09/1989WO1989002139A1 Use of telecommunications systems for lotteries
03/09/1989DE3828881A1 Nachrichtenregistrier- und uebermittlungsvorrichtung fuer abwesende empfangspersonen Nachrichtenregistrier- and by mediation device for receiving absent persons
03/09/1989DE3729015A1 Method and arrangement for storing messages in a telephone PBX
03/08/1989EP0305701A2 Circuit arrangement for the operation of call handling or information positions in centrally controlled telephone exchanges, especially multiple operator's position exchanges
03/08/1989CN1003553B Data subsystem traffic control apparatus and method
03/07/1989US4811388 Telecommunication network including a central back-up memory
03/07/1989US4811384 Method for level regulation of message information
03/07/1989US4811383 Message exchange device for communication between a manager and particular persons
03/07/1989US4811382 Method and apparatus for applying messages in a telecommunications network
03/07/1989US4811381 Direct inward dial integration apparatus
03/07/1989US4811334 Method of operation of a nodal telephone and data communication network to provide specific facilities in changeable domains of the network
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