Patents
Sitemap › H04 - Electric communication technique › H04M - Telephonic communication › H04M 7 - Arrangements for interconnection between switching centres
Patents for H04M 7 - Arrangements for interconnection between switching centres (24,777)
07/1991
07/23/1991CA1286757C Call data collection and modification of received call distribution
07/03/1991EP0435448A2 Arrangement for routing packetized messages
07/02/1991US5029200 Voice message system using synthetic speech
07/02/1991US5029165 Method of allotting links and routing messages for a common channel type signalling transfer point
06/1991
06/05/1991EP0430534A1 Control of non-locally switched telecommunication services
06/05/1991CA2031179A1 Thermal protection arrangement for an integrated circuit subscriber line interface
06/05/1991CA2029140A1 Control circuit for a solid state telephone line circuit
06/05/1991CA2029139A1 High voltage subscriber line interface circuit
05/1991
05/29/1991EP0288462B1 Routing of network traffic
05/28/1991US5020100 Telephone line loop current regulator
05/28/1991US5020053 Channel access system
05/08/1991EP0426356A2 Telecommunications network route selection
05/02/1991EP0425146A2 Apparatus for controlling a digital crossconnect system from a switching system
05/02/1991EP0425145A2 Method and apparatus for providing real-time switching of high bandwidth transmission channels
05/02/1991EP0424877A2 Malicious call detection method and system
04/1991
04/24/1991CA2028258A1 Malicious call detection method and system
04/23/1991US5010545 Asynchronous time-division multiservice digital satellite center for connecting subscribers
04/17/1991EP0423053A2 Method of using cached partial trees in computing a path in a data communication network
03/1991
03/27/1991EP0418831A2 Paging method in a private branch exchange with a paging device providing operation modes for paging different from each other
03/26/1991US5003584 Method and apparatus for the billing of value-added communication calls
03/26/1991US5003573 Self-diagnosis of loop start and ground start trunk interfaces
02/1991
02/13/1991CN1049257A Message switching arrangements
02/12/1991US4993014 Communications
02/06/1991EP0411798A2 End-to-end network surveillance
02/06/1991EP0411742A2 Message switching arrangements
02/05/1991US4991203 Line switching apparatus and method
02/03/1991CA2014198A1 Message switching arrangements
01/1991
01/30/1991EP0410657A2 Apparatus and method for processing a freephone number telephone call
01/29/1991US4988209 Telephone agent management information system
01/22/1991US4987587 Method and apparatus for providing 800 number service
01/16/1991CN1048640A Comprehensive communication system for electric power dispatching
01/02/1991EP0405830A2 Fully shared communications network
12/1990
12/27/1990EP0403999A1 Line junction for analogue network lines for a private telephone installation
12/27/1990EP0115507B1 General purpose data control system
12/18/1990US4979164 Switching system reliability
12/18/1990US4979118 Predictive access-control and routing system for integrated services telecommunication networks
12/05/1990EP0400879A2 Dynamic shared facility system for private networks
12/05/1990EP0400394A2 Interface device
12/04/1990US4975944 Method of making call-wait and call-alternation in electronic private branch exchange (EPBX)
11/1990
11/28/1990CN1047427A Carrier independent network services
11/22/1990EP0398183A2 Carrier independent network services
11/06/1990US4969184 Data transmission arrangement
10/1990
10/31/1990CN2064962U Multifunctional hybrid coil interface circuit device
10/24/1990EP0393514A2 Channel access system
10/24/1990EP0393126A1 Routing of network traffic.
10/24/1990CN1046427A Asyn hronous time-division multiservice digital satellite center for connecting subscribers
10/17/1990EP0392415A1 Asynchronous digital time- multiplexed multi-service subscriber connection satellite centre
10/10/1990EP0248812B1 Method and apparatus for efficient resource allocation
10/03/1990EP0389887A2 Switching system with both-way line managing system
09/1990
09/26/1990CN2062928U Electronic circuit for subscriber interface
09/25/1990US4959849 End-to-end network surveillance
09/12/1990EP0386607A2 A predictive access-controll and routing system for integrated services telecommunication networks
09/12/1990CN1009605B Information transmitting device
09/05/1990EP0385670A2 Spontaneous voice and data messaging
08/1990
08/21/1990CA1273134A1 Telephone signal transmission device
07/1990
07/24/1990US4943999 Switching system reliability
07/04/1990EP0376556A2 Real-time network routing
07/04/1990EP0376527A2 Remote agent operation for automatic call distributors
07/04/1990EP0376526A2 Telephone agent management information system
07/03/1990US4939766 Radio telephone system
06/1990
06/28/1990DE3842936A1 Subscriber terminal with time display
06/27/1990CN1043416A System for connecting optical lines to wideband telecommunications exchange
06/14/1990WO1990006645A1 System for cross-connecting high speed digital signals
06/13/1990EP0372446A1 Device for connecting optical lines with a broadband telecommunication exchange
06/12/1990US4933967 Automatically-effected move of a subscriber between electronic message service systems in a network
06/06/1990CN2058046U Non-contact cut-off type telephone general wiring frame plug-in protector
06/05/1990US4932042 Spontaneous voice and data messaging
05/1990
05/29/1990US4930153 PBX voice mail interface
05/29/1990US4930103 Data transmission method in a digital transmission network and apparatus for implimenting same
05/15/1990US4926462 Telephone system
05/08/1990US4924500 Carrier independent network services
04/1990
04/17/1990US4918725 Terminal impedance setting circuit for a two-wire to four-wire converting circuit
04/17/1990CA1267960A1 Multiple access communication system having loop- check circuitry for switching intraoffice connections
04/04/1990CN2055657U Protector for general line-distributor of telephone
04/03/1990US4914690 Universal PBX interface
03/1990
03/28/1990CN2055308U Automatic radio signal transmission station
03/28/1990CN1007400B Railway basic unit service automatic communication system
03/21/1990CN1007315B Communication system with remote-controlled signal receiving apparatus
03/07/1990CN1007117B Extended equipment for communication system
03/06/1990US4907261 Universal DC signalling detector
03/01/1990DE3830003A1 Circuit arrangement for signal adaptation for different telephone systems
02/1990
02/20/1990US4903261 Synchronous packet voice/data communication system
01/1990
01/23/1990US4896350 Arrangement for providing a call-connection service
01/17/1990EP0351009A2 Telephone line loop current regulator
01/16/1990US4894860 Trunk interface circuitry for telephone systems
01/11/1990DE3822427A1 Current sensor for direct-dial exchange circuits
01/10/1990CN1006436B Inter-network connection system
01/09/1990US4893325 Integrated public safety answering point system
12/1989
12/27/1989EP0116577B1 Data signalling system
12/12/1989US4887289 Remote testing of a trunk leading to an automatic call distributor
11/1989
11/07/1989US4879743 PBX and adjunct using multi-frequency tones for communication therebetween
11/07/1989US4879550 Method and system for loop communication
11/02/1989EP0339127A2 Apparatus and method for providing existing telephone switching equipment with the capability of using the SS7 protocol
11/01/1989CN2047083U Telephone line signal exchange apparatus
09/1989
09/26/1989CA1261981A2 Wireless telephone system
09/12/1989US4866704 Fiber optic voice/data network
09/05/1989US4864605 Telephone trunk interface circuit
08/1989
08/30/1989EP0330441A2 Interface to and operation of a voice messaging system
08/16/1989EP0327686A2 Circuit arrangement for a trunk line in communication exchanges, in particular private telephone branch exchanges
08/08/1989US4856058 Office line interface circuits
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