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| Number | Title | Issue Date |
| 4529840 | Multilocation video conference terminal including controllable conference location reconfiguration In a multilocation video conference system, conference locations are dynamically added to or deleted from an ongoing conference without disrupting it. This is realized by controllably enabling or disabling communications ports assigned to the conference l... | 07/16/1985 |
| 4455455 | Internodal conference call administrator A telecommunication network has a plurality of tandem node switches interconnected by trunk circuits. A network control center controller mechanically administers internodal conference calls by storing data pertaining to a scheduled conference call. Prior... | 06/19/1984 |
| 4424418 | Communication system parkhold conferencing A communication system is arranged having a special hold mode (called parkhold) where a station may place any conference connection associated with that station in the parkhold mode. Any station in the system may, by transmitting a certain signal, become ... | 01/03/1984 |
| 4339816 | Conferencing apparatus and methods for a frequency division multiplex communications system A conferencing apparatus for an FDM communications system employs a first available sideband for communication and a second sideband for signaling. Each subscriber in the system has dual receiving and transmitting equipment which enables a subscriber to c... | 07/13/1982 |
| 4317961 | Telephone-conferencing apparatus and method A telephone conferencing and inquiry handling apparatus and method provide a plurality of incoming calls with access to one or more ongoing or new communications groupings or pools. Apparatus for monitoring the level of voice energy on the incoming lines ... | 03/02/1982 |
| 4317960 | Telephone-conferencing and inquiry-handling apparatus and method A telephone conferencing and inquiry handling apparatus and method provide a plurality of incoming calls with access to one or more ongoing or new communications groupings or pools. Apparatus for monitoring the level of voice energy on the incoming lines ... | 03/02/1982 |
| 4317007 | Telephone-conferencing method and apparatus with monitor-only access A telephone conferencing and inquiry handling apparatus and method provide a plurality of incoming calls with access to one or more ongoing or new communications groupings or pools. Apparatus for monitoring the level of voice energy on the incoming lines ... | 02/23/1982 |
| 4278843 | Two-way amplifier arrangement A two-way amplifier arrangement which automatically controls current flowing in the transmission circuits to maintain that current at a fixed level. The two-way amplifier arrangement finds utility as a conference amplifier and as a two-way trunk amplifier... | 07/14/1981 |
| 4268716 | Audio teleconferencing A control unit for establishing a four-wire connection between two terminals via a pair of telephone lines comprises switching means which are operable to provide a connection to a pair of telephone lines, signalling means connectible to said lines via sa... | 05/19/1981 |
| 4259549 | Dialed number to function translator for telecommunications switching system control complex A telecommunication switching system adapted to be connected to lines and trunks has a digital switching network and a control complex for executing system operational functions by program operated processors in response to dialed numbers received from st... | 03/31/1981 |
| 4219699 | Telephone supervision system using DTMF signals A station-to-station supervision system for a telephone system has a dual tone multiple frequency (DTMF) signal generator connected to the transmit line at each subscriber station, and a standard audible signal generator is connected to the receive line a... | 08/26/1980 |
| 4197429 | Gain-adjusting conference circuit A conference circuit (150) is disclosed for use in a telephone switching system (100) to provide communication among three or more subscriber stations (101, 102, 103). The subscriber stations (101, 102, 103) are connected to a plurality of ports (P0, P1, ... | 04/08/1980 |
| 4060700 | Two-party telephone system The present invention relates to a two-party telephone system intended for external calls to and from each of the telephone sets included in the system, and speech connection between said telephone sets and conference calls between the telephones and an e... | 11/29/1977 |
| 4046966 | Conference trunk circuit for an exchange There are disclosed first and second groups of internal office trunks used for an exchange. Each internal office trunk comprises first and second terminals for connecting two subscribers' telephones through a switching matrix circuit according to a demand... | 09/06/1977 |
| 4045615 | Monobus interface circuit using opto-coupled hybrids In order to reduce the signal loss in a telephone line switching and conferencing system there is interposed between each line and the switching matrix a monobus port circuit arranged to convert a transmitted telephone signal into an equivalent current so... | 08/30/1977 |
| 4027098 | Method for establishing conference connections in dial-operated telecommunication exchanges A method for operating dial-operated telecommunication exchanges equipped with broadcast devices to make conference connections is described. Responsive to signals emitted from a calling subscriber, a conference switching device assigned to the broadcast ... | 05/31/1977 |
| 3997731 | Apparatus for custom calling features in a telephone system Disclosed is an arrangement of circuits for providing what is normally called Custom Calling or Special Services features such as signalling and switching for a call waiting or three-way calling. The apparatus shown may provide either feature or may provi... | 12/14/1976 |
| 3975596 | Trunk consultation arrangement An arrangement is disclosed for providing trunk consultation in an electronic private automatic branch exchange which is built around a space divided solid state matrix. The trunk consultation arrangement is enabled by a hookswitch flash from a consulting... | 08/17/1976 |
| 3971895 | Ringing control circuitry with shared ringing loop current detector A time division switching system is disclosed having a plurality of telephone line circuits and common control circuits for switching calls over a time division communication bus. Ringing loop current detectors are shared by groups of the line circuits fo... | 07/27/1976 |
| 3956595 | Circuitry for providing executive ringback in a PBX system In a telephone switching system wherein a plurality of line circuits are terminated in station sets, the line circuits are interconnectable to a plurality of trunk circuits through a multistage switching network. A call originated by a calling party to a ... | 05/11/1976 |
