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| Number | Title | Issue Date |
| 6993321 | Wireless telephone system with mobile instruments for outgoing calls A telecommunication system incorporates individual station instruments simplified by wireless operation, voice dialing, prepaid accounting and out-call operation, all enabled by cooperative system operation including supporting central equipment. Wireless operation ... | 01/31/2006 |
| 6956943 | Method and apparatus for minimizing the telephony ring voltage power supply requirements of an integrated services hub The present invention discloses a method and apparatus for reducing the power required by an integrated services hub supporting a plurality of telephone circuits, comprising offsetting ringing of each of the plurality of telephone circuits such that all the telephon... | 10/18/2005 |
| 6470406 | Managing isochronous processes in a heterogenous work environment In a heterogeneuos work environment a method and apparatus for managing isochronous streaming servers is disclosed. This includes a mechanism for allocating processor resource to streaming servers at admission control time with respect to the business imp... | 10/22/2002 |
| 6389131 | Enhanced initiate call attempt A method and apparatus for establishing calls initiated by an initial call attempt request to permit the characteristics of call connections established in response to the ICA request to be controlled by translation information of a defining port. The def... | 05/14/2002 |
| 5996106 | Multi bank test mode for memory devices A multiple bank memory device is described which can be tested by accessing the multiple memory banks simultaneously. The memory includes a test mode trigger which initiates a test which writes and reads from memory cells located in different memory banks... | 11/30/1999 |
| 5452354 | Ringing tone apparatus The present invention relates to a method for generating the ringing tone of a phone and apparatus according to the method. A ringing tone generator (12)is controlled according to a ringing tone sequence by control circuitry (13), and subscriber identific... | 09/19/1995 |
| 5402480 | Call signal generating circuit A call signal generating circuit includes a step-up transformer having a primary winding and secondary windings and a first switching circuit coupled between the primary winding of the step-up transformer and a D.C. power source for turning ON/OFF at a fr... | 03/28/1995 |
| 5293420 | Ring trip circuit A first part for picking up a signal being proportional to a ringing tone signal transferred on a subscriber line; a second part for extracting an ac component from the thus picked-up signal; and a third part for receiving both the signals from the first ... | 03/08/1994 |
| 5267304 | Directory assistance system In an automated directory assistance system, the telephone number of the calling party is used to determine whether or not the outgoing "spoken" message will include the area code of the sought-after number.... | 11/30/1993 |
| 4962527 | Series ringing signal generator A series ringing signal generator is disclosed which comprises a source of a user control signal. A programmable ringing signal generator is provided for generating an analog sine wave signal having a selectable amplitude and frequency in response to a se... | 10/09/1990 |
| 4955053 | Solid state ringing switch A ringing switch for providing ringing voltage and tripping voltage to the cable pairs of a telephone central office. The switch synchronizes the control signal from a cadence generator with the zero crossing of the ringing voltage to ensure that the volt... | 09/04/1990 |
| 4748659 | Calling signal transmission apparatus In a calling signal transmitting apparatus, a ring trip equipment, including a ring trip detecting circuit for detecting a ring trip signal in response to an off-hook operation of the telephone set during a signal state of an intermittent ringing signal a... | 05/31/1988 |
| 4656659 | Programmable ring signal generator A digitally controlled ring signal generator includes a plurality of ring signal generating sources providing a plurality of inputs to each of a plurality of ring circuits. Each input is an a.c. signal superimposed on a d.c. bias that is greater than or e... | 04/07/1987 |
| 4611097 | Sine wave ring generator This invention depicts a novel sine wave ring generator for use with a telephone circuit and an input voltage having a predetermined range, the generator comprising a switching power supply for providing a pre-determined DC output voltage from the input v... | 09/09/1986 |
| 4479034 | Arrangement of interactive processors for control of ports A common control for a community office (C.O.) switching system includes two interactive processors. One of these interactive processors is a call control processor which comprises the uppermost element in the control hierarchy. It is a stored program pro... | 10/23/1984 |
| 4113990 | Signal sending control system A signal sending control system for use in a telephone system includes a ringing signal sending circuit having a signal source for generating a continuous ringing signal, interrupting means for controlling the sending of the ringing signal over each subsc... | 09/12/1978 |
| 4075430 | Line signalling over common highway for telecommunications system An arrangement for providing signalling to the lines of a telecommunications system employing non-metallic switching crosspoints such as a solid state switching network or time division switching network. In a system employing either type of network, line... | 02/21/1978 |
| 4037117 | Peak shut-off electronic switch A control transistor and a pnpn device are arranged in serial combination with each other, as well as with a source of alternating current and a load. The transistor and pnpn device in combination behave as a two-state semiconductor switch for switching c... | 07/19/1977 |
| 4001516 | Apparatus for feeding and controlling ringing currents in telecommunication systems Apparatus is disclosed for feeding ringing currents from a ringing current supply to line circuits, and for controlling ringing currents in such line circuits, in telephone and other telecommunication systems having an exchange equipped with a source of s... | 01/04/1977 |
| 3953683 | Interrupter for telephone systems A solid state interrupter is described for controlling the visual and audible indicators in telephone systems and more particularly to control the line selection lamps and electromechanical ringers in key telephone sets. The interrupter includes switching... | 04/27/1976 |
