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)
10/1991
10/02/1991EP0449230A2 Translation method and system for commmunication between speakers of different languages
10/02/1991EP0448734A1 Circuit arrangement for the routine testing of the interface between transmission groups and the switching network of a PCM telecommunications exchange
10/02/1991CN2086024U Subminiature distance protector for communication exchange equipment
10/02/1991CN1014201B Processing sequence calls in distributed control switching system
10/01/1991US5054062 Circuit for maintaining hybrid cancellation of signals in a communication system
10/01/1991US5054059 Telephone dialing system for specialized services
10/01/1991US5054055 Telephone system and method for the intelligent use of individual calling line identification information
10/01/1991US5054054 Voice applications generator
10/01/1991US5054050 Drop testing in fiber to the home systems
10/01/1991US5054021 Circuit for nulling the talker's speech in a conference call and method thereof
10/01/1991CA1290083C Analog "blue" signal detector
10/01/1991CA1290044C Broadband signal switching equipment
09/1991
09/29/1991CA2039237A1 Integrated services digital network terminating resistor with line fault protector
09/28/1991CA2034651A1 Distributed protocol for improving the survivability of telecommunications trunk networks
09/26/1991DE4009074A1 Operational data input into telecommunication exchanges or terminals - involves conversion between formats of data received or transmitted over wireless link to remote operation unit
09/25/1991EP0448076A2 Automatic personal search telephone system
09/25/1991EP0447934A2 Method for entering switching related customer and operational data into communication exchanges and/or programmable communication terminals
09/24/1991US5052039 Line interface circuit
09/24/1991US5052038 Apparatus and method for obtaining information in a wide-area telephone system with digital data transmission between a local exchange and an information storage site
09/24/1991US5051979 Method and apparatus for errorless switching
09/24/1991US5051924 Method and apparatus for the generation of reports
09/21/1991CA2038276A1 Telephone message system
09/18/1991WO1991015053A2 Electronic switch supply unit
09/18/1991EP0446827A1 Terminal installation for asynchronous network
09/18/1991EP0446493A1 Routing logic means for a communication switching element
09/17/1991US5050205 Dial line monitor and control unit
09/17/1991US5049873 Communications network state and topology monitor
09/17/1991CA1289282C Subscriber-concentrated communication system
09/17/1991CA1289276C Optical fiber transmission apparatus, in particular for submarine use
09/16/1991WO1991014330A1 Telephone call detecting circuit and a method of remotely accessing and testing a telephone
09/16/1991CA2077747A1 Telephone call detecting circuit and a method of remotely accessing and testing a telephone
09/14/1991CA2037951A1 Telephone test instrument
09/13/1991CA2038092A1 Terminal service facility for non-synchronous system
09/11/1991EP0446129A1 Telephone hold management device
09/11/1991EP0445251A1 Digital telecommunications device
09/11/1991EP0365649A4 Apparatus and method for mapping the connectivity of communications systems with multiple communications paths
09/11/1991CN2084690U Responder for tlelephone traffic operator
09/10/1991US5048081 Arrangement for routing packetized messages
09/10/1991US5048080 Control and interface apparatus for telephone systems
09/10/1991US5048076 Control apparatus for an automated telephone attendant
09/10/1991US5048075 Telephonic-interface statistical analysis system
09/10/1991US5048074 Electronic apparatus for "hands off" control of a voice mail system
09/10/1991US5047766 Broad band signal switching matrix
09/10/1991CA1288846C Broadcast conferencing arrangement
09/07/1991WO1991005428A1 Free standing signalling and message printing system
09/07/1991CA2066459A1 Free standing signalling and message printing system
09/04/1991EP0444536A2 Telephone exchange system and method
09/04/1991EP0444100A1 Communication system providing automatic identification of calling parties
09/03/1991US5046183 Semi-automated operator assistance telecommunication calls
09/03/1991US5046088 Converter for in-band routing and/or origination information
09/03/1991US5046087 Attendant console for telephone exchange
09/03/1991CA1288504C Telephone trunk line testing circuitry
08/1991
08/29/1991DE4039388A1 Key communication system with central computer control - has pair of associated terminals with mutual dependence for certain communication modes
08/29/1991DE4006048A1 Communication system interconnecting subscriber terminals - has terminal of one subscriber serviceable independently of state of terminal of other subscriber
08/28/1991EP0443583A2 Private branch exchange system
08/28/1991CN2083815U Automatic emergency report receiving device
08/27/1991US5043983 Time and charges information delivery for operator assistance telecommunication calls
08/27/1991US5043725 Broadband signal switching equipment
08/27/1991CA1288154C Signal transfer arrangement
08/27/1991CA1288153C Response system of a terminal to an incoming call
08/23/1991WO1991013509A1 Method and system for establishing link with wireless telephone
08/23/1991CA2075279A1 Radio communication system
08/22/1991WO1991012684A1 System for providing automatic voice messaging in a digital network environment
08/22/1991WO1991012535A1 Device for identifying traffic on a paired cable
08/20/1991US5042064 Call control strategy for high capacity telecommunication services
08/20/1991US5042062 Method and apparatus for providing real-time switching of high bandwidth transmission channels
08/20/1991US5042038 Data path checking system
08/20/1991US5042035 Method and apparatus for controlling fault-state displaying of a subscriber's card in switching system
08/20/1991US5042027 Communication network system and method of controlling a communication network
08/14/1991DE4004062A1 Loop monitoring circuit for subscriber connecting line - has cores coupled to voltage dividers, whose other ends are at identical potential
08/14/1991CN1053872A Device used for secondly dialing with speech
08/14/1991CN1053852A Name resolution in a directory database
08/13/1991US5040209 Telephone ringing monitoring and control system
08/13/1991US5040208 Coordinated voice and data display having temporary storage of transaction data
08/13/1991US5040207 Two-telephone intercom
08/13/1991US5040177 Access network for a cordless telephone service
08/13/1991US5040158 Method for operating and maintaining a clock of a system
08/13/1991CA1287679C Controlling key-system groups from a distributed control switching system
08/08/1991WO1991011874A1 Single number information exchange routing process
08/08/1991DE4003523A1 Personal connection for anonymous cooperation of subscribers - employs personal computer for control of temporally programmable connections with number allocated to users identity
08/08/1991DE4002862A1 Broadband PABX for video, audio and data communication - includes narrow band-broadband signalling adaptor modules and connection computer for control of broadband switch matrix
08/07/1991EP0440515A1 International authorization system
08/07/1991EP0440063A2 Broadband pabx
08/07/1991EP0439927A2 Enhanced privacy feature for telephone systems
08/07/1991CN2082493U Users programmed control switchboard of that compound frequency and pulse can secondary dial-up directly into extension
08/07/1991CN2082492U Monitor for signal out of trunk line
08/07/1991CN1053721A Subminiature extending protector for communication exchange
08/07/1991CN1013468B Method and circuit for controlling audio conference between at least three participants
08/06/1991US5038375 Circuit arrangement for preventing gain from responding to frequency variation despite the presence of an isolation transformer
08/06/1991US5038140 Supervisory system in communication system
08/02/1991CA2035376A1 Broadband private automatic branch exchange
08/01/1991WO1991011872A1 Telecommunications line test system
08/01/1991DE4035400A1 Call-back control using cordless personal paging system - holds call-back request in memory for prompt compliance after initial paging attempt is not acknowledged
08/01/1991CA2073764A1 Telecommunications line test system
07/1991
07/31/1991EP0438860A2 Arrangement for blocking or allowing telephone calls to predefined destinations
07/31/1991CN1013424B Equipment and method for monitoring digital subscribers in telephone network
07/30/1991US5036535 Switchless automatic call distribution system
07/30/1991US5036533 System for providing automatic voice messaging in a digital network environment
07/30/1991US5036318 Modular ISDN communication system with formation and display of error texts
07/30/1991CA1287196C Subscriber/craftsperson ringback apparatus
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