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| Number | Title | Issue Date |
| 4545043 | Announcement system message playback arrangement A telephone switching network is disclosed having an announcement system coupled to a toll switching center. A plurality of short phrases are recorded in corresponding sectors of a disc store and announcements are assembled in real time by concatenating t... | 10/01/1985 |
| 4529842 | Automatic fault recovery arrangement A conference arrangement is disclosed having a plurality of logical multiport bridges for conferencing customer stations. Equipment units common to the bridges can be selectively connected to a station controlling each bridge. Upon the detection of a faul... | 07/16/1985 |
| 4523183 | Alarm-fault detecting system A microcomputer controlled circuit arrangement for sensing fire and burglar alarms in the presence of undesired fault conditions, such as opens or shorts, on monitored communication lines. The arrangement includes transistor-resistor sensing circuitry whi... | 06/11/1985 |
| 4509167 | Data conference arrangement An arrangement for conferencing a plurality of data terminals via a data conference bridge. The bridge includes apparatus for negotiating a common set of communication parameters when data terminals having differing capabilities are connected to the same ... | 04/02/1985 |
| 4499578 | Method and apparatus for controlling signal level in a digital conference arrangement For use in multiport digital conference arrangements wherein speech samples of selected speakers are summed for distribution to the conferees, the disclosed method and apparatus controls the level of speech represented by information samples to be include... | 02/12/1985 |
| 4284851 | Arrangement for frustrating fraudulent telephone calls A method and arrangement for frustrating attempted fraudulent calls from a station using a "blue box" device to avoid toll charges. Upon detecting a possible fraudulent call, the sequence of digits from the blue box is altered to divert the call from its ... | 08/18/1981 |
| 4278849 | Test arrangement for automatic number identification systems A testing arrangement for automatic number identification apparatus is disclosed in a step-by-step telephone system. The "M" leads which apply identification tones to the sleeves of calling lines are periodically scanned for trouble conditions. If an "M" ... | 07/14/1981 |
| 4277649 | Method and apparatus for screening telephone calls A telephone system is disclosed for providing customized telephone services. A called customer can screen calls incoming to his station based on the identity of the calling line. The calling line's identity is forwarded to the switching office containing ... | 07/07/1981 |
| 4260859 | Method and apparatus for detecting transmission system failures in a communications network The failure of an interoffice carrier transmission system is detected by monitoring the signaling irregularities on the trunks served by the system. When at least two trunks fail to return a "start-dial" signal from the terminating office, all trunks are ... | 04/07/1981 |
| 4228328 | Signal distributor test arrangement An arrangement for testing relay contacts of a signal distributor is disclosed. The output relay contacts are coupled via isolation diodes to a common circuit node and the input relay contacts are coupled to a second node. A potential is applied to the fi... | 10/14/1980 |
| 4224472 | Method and apparatus for apportioning call charges Apparatus is disclosed for apportioning charges on calls originating from coin telephones. At the end of the initial talking period which was paid for by the coin station, an overtime signal is sent to the called station. The called station signals if it ... | 09/23/1980 |
| 4199665 | Method and arrangement for controlling traffic over two-way trunks A toll switching office is disclosed having an arrangement for reserving a portion of a two-way trunk group for incoming calls only. As each outgoing call is offered to the trunk group the number of idle trunks is compared to the threshold of trunks to be... | 04/22/1980 |
| 4182934 | Method and apparatus for detecting irregular telephone calls Certain telephone calls cannot be billed properly due to the failure to detect a valid answer signal from the called customer. This disclosure presents an arrangement for detecting irregular calls that are recognized initially by a momentary off-hook sign... | 01/08/1980 |
| 4090034 | Usage-sensitive billing arrangement for private branch exchange subscribers A telephone system is disclosed including hotel and motel private branch exchanges (PBXs), a local step-by-step exchange serving the PBXs, and a remote message accounting center. A call data accumulator at the local exchange monitors line finders and coop... | 05/16/1978 |
| 4089594 | Sun screen structure A sun screen structure is disclosed which consists of a covering for external building surfaces that reflect sunlight during summer months and admit it during winter months to help stabilize internal building temperatures. The covering consists of a plana... | 05/16/1978 |
| 4056687 | Decoupling control arrangement for auxiliary circuits coupled to telephone lines A common control circuit is disclosed for controlling bypassing relays to disconnect telephone line auxiliary circuits from their respective lines preparatory to line testing or for other desired purposes. The control circuit responds to a bypass request ... | 11/01/1977 |
| 4040023 | Recorder transfer arrangement maintaining billing data continuity Redundant but independently operable data processors called encoders are arranged so that control of a particular recorder gathering billing data in a telephone switching system can be transferred while maintaining billing continuity for calls being handl... | 08/02/1977 |
| 4027104 | Arrangement for automatically generating alternate telephone station identification codes A telephone communication system is disclosed in which toll calls of a first class are routed from an originating exchange to a remote exchange for completion and storage of billing information and toll calls of a second class are processed proximate to t... | 05/31/1977 |
| 4012598 | Method and means for pulse receiver synchronization A receiver is disclosed which operates for synchronously receiving pulses of a serial stream without synchronizing the receiver clock to the clock at a transmitting site. Circuitry is provided for generating multiple delayed pulse signals in response to e... | 03/15/1977 |
| 4007336 | Class of call discriminating trunk circuit A communication system is disclosed for providing itemized telephone subscriber billing of special assistance calls. A local office not equipped with automatic message accounting facilities is interconnected via a trunk circuit to another exchange having ... | 02/08/1977 |
| 3995117 | Message billing arrangement for a communication system An automatic message billing arrangement for use with a telephone system is disclosed. The billing arrangement monitors the trunks to ascertain when a trunk is seized for service. In response to a trunk being seized, the common control markers, which esta... | 11/30/1976 |
