| Patents for H04M 3 - Automatic or semi-automatic exchanges (99,881) |
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| 02/06/1990 | US4899358 Call announcement arrangement |
| 02/06/1990 | CA1265632A2 Answer supervision with automatic voice sensitivity and cadence history |
| 02/01/1990 | DE3826025A1 Method for exchanging data between an access control system and a communication switching system |
| 02/01/1990 | DE3825898A1 Method for dynamic allocation of function keys to telephone terminal functions which can be invoked by said keys |
| 02/01/1990 | DE3825895A1 Telephone terminal with function keys |
| 01/31/1990 | EP0353102A2 Automatic call distribution (ACD) switching system having distributed processing capability |
| 01/31/1990 | EP0352735A2 Method for realizing a service-specific command procedure in a calculator-controlled communication system, especially a key telephone system, with the posibility of breaking-in |
| 01/31/1990 | EP0352701A2 Method for realizing a service-specific command procedure in a calculator-controlled communication system, especially a key telephone system, with the possibility of breaking-in |
| 01/31/1990 | EP0352700A2 Method for realizing a service-specific command procedure in a calculator-controlled communication system, especially a key telephone system, with the possibility of breaking-in |
| 01/30/1990 | US4897867 Method of and an arrangement for forwarding a customer order |
| 01/30/1990 | US4897866 Telecommunication system with subscriber controlled feature modification |
| 01/30/1990 | US4897645 Broadband signal switching equipment |
| 01/30/1990 | CA1265273A1 Integrated calling directory |
| 01/30/1990 | CA1265227A1 Method for monitoring and controlling the traffic in digital transmission networks |
| 01/25/1990 | DE3832619C1 Checkable line termination for a telephone line and method for checking the line termination from the telephone switchboard |
| 01/25/1990 | DE3824492A1 Method and arrangement for the testing and remote-controlled activation of telephone connections |
| 01/24/1990 | EP0352040A2 Apparatus for the automatic in-circuit testing of subscriber line interface circuits and method therefor |
| 01/24/1990 | EP0351757A2 Method of video conference, video conference terminal, method of informing and data terminal |
| 01/24/1990 | EP0351729A2 Optical switching system |
| 01/24/1990 | CN2051807U Subscribers' telephone exchange capable of dialing into extension directly |
| 01/23/1990 | US4896352 Telephone set circuit including an overvoltage protection |
| 01/23/1990 | US4896351 Apparatus for separating dc current and ac current components of a composite signal |
| 01/23/1990 | US4896346 Password controlled switching system |
| 01/23/1990 | US4896345 Call handling system |
| 01/18/1990 | DE3823925A1 Arrangement for testing peripheral connection modules of a communications system |
| 01/17/1990 | EP0351234A2 Systems for facilitating communications among asynchronously executing processes in digital data processing system |
| 01/17/1990 | EP0351161A2 Testing communications systems |
| 01/17/1990 | EP0350918A2 Electronic switching system having call-forwarding function |
| 01/16/1990 | US4894864 Interface circuit |
| 01/16/1990 | US4894861 Terminal in communication network for notifying originating party's number |
| 01/16/1990 | US4894859 Apparatus for connecting a plurality of channels |
| 01/16/1990 | US4894857 Method and apparatus for customer account servicing |
| 01/16/1990 | US4894825 Frequency-division multiplex broadband multimedia network |
| 01/11/1990 | DE3822892A1 Method of determining the time sequence of two time points |
| 01/10/1990 | EP0350402A1 Personal computer integrating a digital ISDN subscriber terminal |
| 01/10/1990 | EP0349709A2 Video conference arrangement |
| 01/09/1990 | US4893336 Call forwarding arrangement |
| 01/09/1990 | US4893335 Remote access telephone control system |
| 01/09/1990 | US4893330 Method and apparatus for restricting credit card communication calls |
| 01/09/1990 | US4893329 Call deferral system for telephones |
| 01/09/1990 | US4893328 Automated telephone operator overflow device |
| 01/09/1990 | US4893326 Video-telephone communications system |
| 01/09/1990 | US4893325 Integrated public safety answering point system |
| 01/09/1990 | US4893301 Automatic call distribution (ACD) switching system having distributed processing capability |
| 01/03/1990 | EP0349477A2 Solid state overvoltage protection circuit |
| 01/03/1990 | EP0349079A2 Ciruit arrangement for the transmission of information |
| 01/03/1990 | CN1038558A Dynamic callback technique |
| 12/28/1989 | WO1989012944A1 Wide band communication system |
| 12/28/1989 | WO1989012938A1 Response control system |
| 12/27/1989 | EP0348025A1 Line interface unit |
| 12/27/1989 | CN1006272B Wideband high voltage amplifier for telephone exchange subscriber line interface utilizing low voltage control circuitry |
| 12/26/1989 | US4890322 Method and apparatus for subscription broadcast |
| 12/26/1989 | US4890317 Automatic validation of telephone account numbers |
| 12/20/1989 | EP0347155A2 Communication apparatus |
| 12/20/1989 | EP0346568A2 Method for mutual data communication between a communication exchange and a staff presence detection installation |
| 12/19/1989 | US4888766 Multi-terminal control system |
| 12/19/1989 | US4888652 Communications recorder having a unique identification code and secure method and apparatus for changing same |
| 12/14/1989 | WO1989012368A1 Portable call generator |
| 12/14/1989 | WO1989012271A1 Voice information system and method for telephone applications |
| 12/14/1989 | DE3819681A1 Method for distinguishing between incoming and outgoing connection set-up in telephone stations |
| 12/13/1989 | EP0345623A2 Switching device for broad-band signals |
| 12/12/1989 | US4887289 Remote testing of a trunk leading to an automatic call distributor |
| 12/07/1989 | DE3818087A1 Digital communications system with a computer controller |
| 12/07/1989 | DE3818086A1 Method for setting up conference calls in a computer-controlled communications system |
| 12/06/1989 | EP0344672A1 Consumer communication and information system |
| 12/05/1989 | US4885765 Telephone system with stimulus operation or default operation |
| 12/05/1989 | US4885763 Voice mail system with improved detection and cancellation |
| 12/05/1989 | CA1263776A1 Telephone test set |
| 11/29/1989 | EP0343160A1 Automatic speech recognition to select among call destinations. |
| 11/23/1989 | EP0342667A2 Automatic call distribution system |
| 11/23/1989 | EP0342593A2 Pulse mode modulaton terminal equipment |
| 11/23/1989 | EP0342547A1 Method for generating an alarm suppression signal |
| 11/23/1989 | EP0342314A2 Anonymous interactive telephone system with expanded outward calling features |
| 11/23/1989 | EP0342295A2 Interactive call-handling |
| 11/23/1989 | DE3817228A1 Conference bridge |
| 11/21/1989 | US4882748 Homologated protector modules for telephone connector blocks |
| 11/21/1989 | US4882744 Automatic paging system |
| 11/21/1989 | US4882743 Multi-location video conference system |
| 11/21/1989 | US4882699 Communications network routing and management system |
| 11/21/1989 | US4882681 Remote language translating device |
| 11/16/1989 | WO1989011189A1 D channel monitor |
| 11/15/1989 | EP0341816A1 Apparatus and method for testing a customer line |
| 11/15/1989 | EP0341800A2 Electronic audio communication system with user controlled message address |
| 11/15/1989 | EP0341687A2 Private automatic branch exchange system |
| 11/15/1989 | EP0116067B1 Demultiplexer circuit |
| 11/15/1989 | CN1037248A Call traffic control |
| 11/14/1989 | US4881261 Method for predictive pacing of calls in a calling system |
| 11/14/1989 | US4881230 Expert system for processing errors in a multiplex communications system |
| 11/14/1989 | US4881229 Test circuit arrangement for a communication network and test method using same |
| 11/14/1989 | US4881221 Method and apparatus for disabling an echo canceller on a digital telecommunications network |
| 11/08/1989 | EP0340665A2 Exchange system having originating call restriction function |
| 11/07/1989 | US4879743 PBX and adjunct using multi-frequency tones for communication therebetween |
| 11/07/1989 | US4879739 Wiring test device and method |
| 11/02/1989 | WO1989010670A1 Dynamic callback technique |
| 11/02/1989 | WO1989010612A1 Voice-operated service |
| 11/02/1989 | EP0339476A2 Method and device for the institution of electronic communication service messages composed of speech and non-speech components |
| 11/02/1989 | EP0339467A1 Method and device for composing communication messages consisting of speech elements and data elements |
| 11/02/1989 | EP0339432A2 Method for a calculator-controlled switching device, especially for a key-telephone exchange, in which data and telephone terminals are connectible alternatively |
| 10/31/1989 | US4878243 Call forwarding system and method |
| 10/31/1989 | US4878240 Multi-service telephone switching system |