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)
12/1991
12/03/1991US5070524 Telephone system
12/03/1991US5070523 Private automatic business exchange
12/03/1991US5070453 System and method for scheduling data transfers among a plurality of data processing units to avoid conflicting data requests
12/01/1991CA2043290A1 Wireless telephone service access method
11/1991
11/28/1991WO1991018483A1 Data network interface
11/28/1991WO1991018466A1 Method and apparatus for providing proactive call services following call completion
11/28/1991WO1991018453A1 Audio signal processor circuit
11/28/1991WO1991018386A1 Simultaneous speaker-independent voice recognition and verification over a telephone network
11/28/1991WO1991015053A3 Electronic switch supply unit
11/28/1991DE4016629A1 Service telephone unit with dual-tone multi-frequency decoder - protects service conversations by provision of engaged tone from internal generator and switch operated by microcontroller
11/28/1991CA2365302A1 Method of recognizing alphanumeric strings spoken over a telephone network
11/27/1991EP0458710A1 Telephone system with a plurality of telephone terminals on a single line
11/27/1991CN2089678U Automatic relay of user's automatic telephone exchanger
11/27/1991CN1056611A Terminal system for service desk of numerically program-controlled exchanger
11/27/1991CN1014950B System for connecting optical lines to wideband telecommunications exchanger
11/26/1991US5068892 Telecommunications system
11/26/1991CA1292540C Method for connection of secure conference calls
11/26/1991CA1292503C Surge protector for telecommunications terminals
11/21/1991EP0457239A1 Structure of data processing automaton
11/21/1991EP0457077A2 Accessing alphanumeric information using a numeric keypad
11/21/1991DE4019537C1 Information handling system for telephone exchange - stores entered telephone numbers into respective memory location for each subscriber
11/19/1991US5067153 Method for transmitting subscriber data in communication systems from one secret subscriber equipment to another
11/19/1991US5067149 Telephone line communications control system with dynamic call streaming
11/19/1991US5067074 Control of overload in communications networks
11/17/1991CA2042615A1 Data processing automaton structure
11/14/1991WO1991017616A1 Digital computer platform for supporting telephone network applications
11/13/1991EP0456128A2 Method for diverting or forwarding calls in telephone exchanges
11/13/1991EP0455912A2 Electronic messaging system with multiple personal greetings
11/12/1991US5065424 Apparatus for servicing telephones from a remote location
11/12/1991US5065422 Subscriber call simulator capable of testing new services of a telephone switching system
11/12/1991CA2034419A1 Electronic messaging system with multiple personal greetings
11/12/1991CA1292041C Cellular cordless telephone
11/06/1991EP0455335A1 Subscriber line interface circuit
11/06/1991EP0454926A2 Drop testing in fiber to the home systems
11/06/1991EP0454884A1 Telephone exchange, in particular a private branch exchange with a central stored program computer control
11/06/1991EP0273922B1 Apparatus in a telecommunication system for supplying power to a telephone set
11/06/1991CN1056032A Calling limit circuit for terminal on telephone network
11/06/1991CN1014667B Selecting arrangements for multiplex systems
11/06/1991CN1014666B Communication system having unified messaging
11/05/1991US5063595 Optical communications network
11/05/1991US5063592 Control of non-locally switched telecommunication services
11/05/1991US5063585 Telephone subscriber line fault detector
11/05/1991US5063584 Method for testing subscriber's equipment
11/05/1991CA2041747A1 Passive optical telecommunication system
11/05/1991CA1291826C Modular isdn communication system with formation and display of error texts
10/1991
10/31/1991WO1991016781A1 Telecommunications system with timed-do-not-disturb
10/31/1991WO1991016780A1 Method of displaying circuit state of telephone exchange system
10/31/1991WO1991016779A1 Long distance telephone switching system with enhanced subscriber services
10/31/1991WO1991016677A1 Recoverability in mass storage data base systems
10/31/1991DE4013387A1 Telephone system operation - in which main phone is controlled by central controller and extensions can be added by 4-line
10/30/1991EP0454421A2 Improvements relating to telecommunications equipment
10/30/1991EP0454363A2 Voice password-controlled computer security system
10/30/1991EP0454332A2 Call processing in an intelligent network
10/30/1991EP0454316A2 Data terminal for communicating over a telephone circuit
10/30/1991EP0453831A2 User interfaces for telecommunications based services
10/30/1991EP0453825A2 Method for measuring line parameters of subscriber lines of a telephone network
10/30/1991CN1055854A Private telephone system with simplified command feature
10/29/1991US5062151 Communication system
10/29/1991US5062133 Multi-function telephone call management system
10/29/1991US5062131 Telephone line monitoring circuit for providing a visual and auditory signal if the telephone line becomes inoperative
10/29/1991US5062103 Telephone agent call management system
10/29/1991US5061992 Tv phone communication system and apparatus therefor
10/29/1991CA1291550C Directory assistance call processing and non-supervisory signal monitoring arrangements
10/26/1991CA2040724A1 Voice password controlled computer security system
10/25/1991CA2041003A1 Call processing
10/24/1991CA2222659A1 Long distance telephone switching system with enhanced subscriber services
10/24/1991CA2040807A1 Data terminal for communicating over a telephone circuit
10/23/1991EP0453389A2 Modular public telephones management system
10/23/1991EP0453128A2 Multiple call control method in a multimedia conferencing system
10/23/1991EP0452629A2 Telephone apparatus capable of setting card unit therein as electronic notebook
10/23/1991EP0452591A2 Method and apparatus for the billing of value-added communication calls
10/22/1991US5060258 Call traffic control
10/22/1991US5060256 Mass polling system with cut-through
10/22/1991US5060255 Telecommunications system with timed-do-not-disturb
10/17/1991WO1991015916A1 Automatic system for the playback of recorded spoken messages through a telephone line
10/17/1991WO1991015914A1 Method of and system for control of special services by remote access
10/17/1991WO1991015818A1 System for searching and retrieving data from data bases via audio access with automatic faxing of results
10/17/1991DE4012193A1 Telephone subscriber circuit with data card reader - uses sensor coupled to evaluation and control device transmitting data to exchange
10/17/1991CA2040550A1 Synthesized speech terminal system for data communication
10/16/1991EP0451759A2 Method for testing the transmission characteristics of a subscriber line circuit
10/16/1991EP0451711A2 Self-diagnosis of loop start and ground start trunk interfaces
10/16/1991EP0451695A2 Method and apparatus for securing access to telecommunications based assets and services
10/16/1991EP0451693A2 Method and apparatus for providing integrated access to telecommunication based services
10/16/1991EP0451400A2 Method and apparatus for reconfiguring interconnections between switching system functional units
10/16/1991EP0451312A1 Switching device for broad-band signals
10/15/1991US5058152 Anonymous interactive telephone system having direct connect feature
10/15/1991US5057964 Surge protector for telecommunications terminals
10/13/1991WO1991016796A1 Private telephone system with simplified command feature
10/13/1991CA2040194A1 Broadband signal switching equipment
10/09/1991EP0450610A2 Telecommunications voice and data services network architecture
10/09/1991EP0450550A2 Communication apparatus with electronic notebook and telephone exchange related to the same
10/09/1991EP0450045A1 Telephone system used for the distribution of advertising messages
10/09/1991CN1055270A Microprocessor controlled ground system monitor
10/09/1991CN1014292B Apparatus for connecting and disconnecting a ring signal to a called subscriber
10/08/1991US5056131 Telephone line monitoring circuitry and apparatus
10/08/1991US5056086 Apparatus for providing telephonic mass announcement service and methods for use therein
10/03/1991WO1991015073A1 Automatic voice/data messaging enhancements
10/03/1991WO1991015066A1 Distributed protocol for improving the survivability of telecommunications trunk networks
10/02/1991EP0449480A2 Real-time network routing
10/02/1991EP0449262A1 Integrated services digital network terminating resistor with line fault protector
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