| Patents for H04M 3 - Automatic or semi-automatic exchanges (99,881) |
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| 03/10/1992 | US5095504 Telephone and telephone system having temporary transfer and hold-release functions |
| 03/10/1992 | CA1297201C Method and apparatus for automatically selecting system commands fordisplay |
| 03/04/1992 | EP0472524A1 Device for identifying traffic on a paired cable. |
| 03/04/1992 | CN1059243A Automatic answering and connecting method for micro-processor controlled pbx capable of direct inward dialing |
| 03/03/1992 | US5093858 Method and apparatus for performing an automated collect call |
| 03/03/1992 | US5093855 Method for speaker recognition in a telephone switching system |
| 03/03/1992 | US5093854 Phone actuated calendar |
| 03/03/1992 | US5093824 Distributed protocol for improving the survivability of telecommunications trunk networks |
| 03/03/1992 | US5093813 Multiple mode electronic scheduler |
| 03/03/1992 | CA1296796C Broadband signal switching equipment |
| 02/26/1992 | EP0472405A2 Telecommunication equipment protector |
| 02/26/1992 | EP0472389A2 Method and apparatus for programming a voice services system |
| 02/26/1992 | EP0472348A2 Economical videoconference system |
| 02/26/1992 | EP0472156A2 Method of accounting fees in switching system and apparatus for performing same |
| 02/26/1992 | EP0472125A2 Voice services system |
| 02/26/1992 | EP0471877A1 Digital telephone device |
| 02/25/1992 | US5091934 Tone modification system for telephone system with clock |
| 02/25/1992 | US5091933 Multiple party telephone control system |
| 02/25/1992 | US5091904 General signaling service unit of electronic switching system |
| 02/23/1992 | CA2047373A1 Economical videoconference system |
| 02/20/1992 | WO1992003005A1 Telephone and facsimile message system |
| 02/20/1992 | WO1992003003A1 Electrical apparatus for simulating functions of a complex switching device |
| 02/20/1992 | DE4026179A1 Message transmission system for mobile telephony - has memories for call criteria which are transmitted from base station to originators of calls from mobile stations to their counterparts |
| 02/19/1992 | EP0471216A2 Method for testing the line connection before switching-over from a telephone exchange which is to be disabled, to a new digital exchange ready to be put into operation |
| 02/12/1992 | EP0470415A2 Call tagging user information in a telephonic environment |
| 02/11/1992 | CA1295758C Pair gain applique |
| 02/06/1992 | WO1992002090A1 Method of controlling a digital coupling-field store |
| 02/04/1992 | US5086470 Scrambling in digital communications network using a scrambled synchronization signal |
| 02/04/1992 | US5086458 Telephone answering system and apparatus for direct caller selection of a party line extension |
| 02/04/1992 | US5086394 Introduction system for locating compatible persons |
| 02/04/1992 | US5086348 System for connecting optical lines to a wideband telecommunications exchange |
| 02/04/1992 | CA1295433C Method and apparatus for storing and forwarding voice signals and generating replies |
| 02/03/1992 | CA2048288A1 Telephone and facsimile message system |
| 01/29/1992 | CN2094837U Telephone dispersing connection device |
| 01/23/1992 | WO1992001351A1 Improvements in and relating to communications systems |
| 01/23/1992 | WO1992001350A1 Method of establishing a cost-efficient communications path between internationally-remote parties |
| 01/23/1992 | DE4023138A1 HV protection circuit for telephone subscriber's appts. - disconnects upon application of excess voltage and reconnects when voltage falls with potential tapping at indication circuit |
| 01/23/1992 | DE4023032A1 Controlling digital memory of multiple switching bay - using TDM procedure to establish connections including conference set=up via telephone exchange |
| 01/22/1992 | EP0467367A1 Subscriber line circuit for connection of a subscriber line for the transmission of analogue subscriber signals to a digital time division multiplex telephone exchange |
| 01/22/1992 | EP0467212A2 Arrangement for the protection of a feed circuit of a subscriber line circuit of a telephone exchange against external overvoltages |
| 01/21/1992 | US5083308 Arrangement for determining switch port status at an adjunct processor |
| 01/15/1992 | EP0466590A1 Digital communication system for an integrated services telephone installation |
| 01/15/1992 | EP0466224A1 A method and device for supervising and testing majority voting |
| 01/15/1992 | EP0466078A2 Subscriber connection unit with self routing for a telecommunication network having an intelligent network structure |
| 01/14/1992 | CA1294346C Telephone system for connecting a customer to a supplier of goods |
| 01/11/1992 | WO1992001357A1 A method and a device for supervising and testing majority voting |
| 01/11/1992 | WO1992001347A1 Digital communication system for integrated services telephone installations |
| 01/10/1992 | CA2020756A1 Apparatus for servicing telephones from a remote location |
| 01/09/1992 | WO1992000642A1 Enhanced telephony apparatus and system |
| 01/09/1992 | DE4113366A1 Telephone exchange return call signalling system - has calling subscriber number data stored with information indicating return call requirement |
| 01/09/1992 | DE4020618A1 Signalling system for telephone return call connection - uses memory to hold call number data of calling subscriber |
| 01/08/1992 | EP0465089A2 Automated channel test unit |
| 01/08/1992 | EP0465058A2 Written language parser system |
| 01/08/1992 | EP0464610A2 Method for generating an information for the called subscriber in a communication system, especially a private telecommunication system |
| 01/08/1992 | EP0464418A2 Circuit arrangement for controlling display elements disposed in the form of a matrix |
| 01/08/1992 | EP0464283A2 Arrangement for reserving and allocating a plurality of competing demands for an ordered bus communications network |
| 01/08/1992 | EP0259447B1 Telecommunication network and methods relating thereto |
| 01/08/1992 | CN2092836U Device for leaving message |
| 01/07/1992 | CA1294076C Direct access test unit for central office |
| 01/02/1992 | EP0463832A2 Control and interface apparatus for telephone systems |
| 01/02/1992 | EP0463831A2 Key telephone interface |
| 01/02/1992 | EP0463808A2 Switching of a digital signal to an alternate channel transmitted via a different route |
| 01/02/1992 | EP0463384A1 Method of access to a cordless telephone service |
| 01/02/1992 | DE4105290A1 Communications peripheral selection information memory - with transfer of selection information indicated on optical display for use as call repetition information |
| 12/31/1991 | US5077789 Remotely commanded telephone switch enhancing system |
| 12/31/1991 | US5077788 System and method for processing telephone communication |
| 12/31/1991 | US5077630 Integrated services digital network terminating resistor with line fault protector |
| 12/31/1991 | US5077554 Control system for communication between units |
| 12/31/1991 | CA1293830C2 Telephone system with stimulus operation or default operation |
| 12/27/1991 | EP0462890A2 Communications systems |
| 12/27/1991 | EP0462649A2 Circuit for switching a telephone device between a voltage ringing generator and a power supply circuit |
| 12/27/1991 | EP0462488A2 Apparatus for capturing and storing call activity at a telephone set |
| 12/26/1991 | WO1991020148A1 Routing of network traffic using discrete traffic measurement data |
| 12/24/1991 | US5075894 Telephone message forwarding apparatus |
| 12/24/1991 | US5075850 Translation communication system |
| 12/22/1991 | WO1991020147A1 Telephone paging system for connecting calling and paged parties |
| 12/22/1991 | CA2085905A1 Telephone paging system for connecting calling and paged parties |
| 12/19/1991 | DE4018544A1 Testing emergency call system with subscribers - generating preset number of test pulses within preset time interval and transmitting to evaluator circuit |
| 12/18/1991 | CN2091048U Switchboard for party-line telephone |
| 12/18/1991 | CN2091047U Crossbar switch capable of preventing strong current damage of sender |
| 12/17/1991 | US5073929 Voice-data telephonic control system |
| 12/17/1991 | US5073923 Private telephone system with unified command feature |
| 12/17/1991 | US5073922 Communication terminal apparatus |
| 12/17/1991 | US5073920 Method and apparatus of measuring a subscriber line |
| 12/17/1991 | US5073919 Automatically testing telephone lines |
| 12/17/1991 | US5073890 Remote agent operation for automatic call distributors |
| 12/17/1991 | US5073775 Broadband signal switching equipment |
| 12/11/1991 | EP0460843A2 Network planning tool |
| 12/11/1991 | EP0460816A2 Method and apparatus for dynamic and interdependent processing of inbound calls and outbound calls |
| 12/11/1991 | EP0460405A2 Method for the automatic establishment of interconnections for data, speech and announcements in communication exchanges |
| 12/11/1991 | EP0460398A1 Passive optical telecommunication system |
| 12/10/1991 | CA1293072C Apparatus for connecting and disconnecting a ringing signal to a called subscriber |
| 12/10/1991 | CA1293041C Automatic voice processing assisted customer information system |
| 12/04/1991 | EP0459563A2 Relaying system with a conference device |
| 12/04/1991 | EP0459419A2 Television conference system |
| 12/04/1991 | EP0458791A1 Payphone system. |
| 12/04/1991 | CN1056785A 呼叫处理 Call Processing |
| 12/04/1991 | CN1015042B Marker |
| 12/03/1991 | US5070526 Signal analyzing system |
| 12/03/1991 | US5070525 Method for avoiding call blocking |