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| Number | Title | Issue Date |
| 7415029 | Programmable FSM engine using a new CAS application language An apparatus including a private branch exchange (PBX) switch, a residential gateway to receive channel associated signals (CAS) from the PBX switch, and a programmable CAS module to convert the CAS signals into internet protocol (IP) signals is disclosed. ... | 08/19/2008 |
| RE40057 | Method and apparatus for providing interoperation between a digital communication system and a public switched telephone network An interworking unit (14) for providing an interface between a digital communication network (12) and a public switched telephone network (PSTN) (16) includes a de-vocoder (30), a protocol termination unit (32), and a signal combin... | 02/12/2008 |
| 7240238 | Remote data mirroring Two data storage systems are interconnected by a data link for remote mirroring of data. Each volume of data is configured as local, primary in a remotely mirrored volume pair, or secondary in a remotely mirrored volume pair. Normally, a host computer directly acces... | 07/03/2007 |
| 7073090 | Remote data mirroring system having a remote link adapter A primary data storage system is linked to a geographically remote secondary data storage system for automatically maintaining a remote copy of the data in the primary storage. The primary data storage system has a primary cache memory, and the secondary data storag... | 07/04/2006 |
| 7055059 | Remote data mirroring Two data storage systems are interconnected by a data link for remote mirroring of data. Each volume of data is configured as local, primary in a remotely mirrored volume pair, or secondary in a remotely mirrored volume pair. Normally, a host computer directly acces... | 05/30/2006 |
| 6744880 | Method for creating a telephone digital switching platform A method for creating a telephone digital switching platform to provide conversion and routing of telephone calls arriving on a number of telephony interfaces to a number of outbound telephony interfaces, based on in parameter and out of parameter call setup informa... | 06/01/2004 |
| 6519336 | Method and apparatus for providing interoperation between a digital communication system and a public switched telephone network An interworking unit (14) for providing an interface between a digital communication network (12) and a public switched telephone network (PSTN) (16) includes a de-vocoder (30), a protocol termination unit (32), and a signal combiner (34) for processing s... | 02/11/2003 |
| 6366664 | Method and system for translating call processing requests A generic translator (10) is provided for processing service requests sent by a digit collection client (16). Requests include billing validation (11), call routing (19), call screening (17), account code validation (15) or other services. These requests ... | 04/02/2002 |
| 6275578 | Method and apparatus for providing back-up, in-band signaling in a communications network A method of detecting and recovering from an out-of-band signaling failure in a telecommunications network involves the reprogramming of switching centers to utilize existent inband signaling capabilities to temporarily replace the failed out-of-band capa... | 08/14/2001 |
| 5940467 | Counting circuit Quality requirements on a counter may set a limit to the highest frequency that can be applied to the counter. This will also limit the resolution. A counter is provided including a generator for generating, in response to a first clock frequency, M secon... | 08/17/1999 |
| 5937343 | Method and system for updating replicated databases in a telecommunication network system A method and system of the present invention updates a replicated database of a telecommunications network system. A call transport system forwards calls from a local telephone station to a destination. A signaling system is operatively connected to the c... | 08/10/1999 |
| 5875244 | Transmission apparatus for relaying different types of trunk signals A transmission apparatus for relaying different types of trunk signals, including a central processing unit including a reception counter processor which is inserted between a pair of exchanges and enables direct relay of exchange trunk signals (Sxt) and ... | 02/23/1999 |
| 5577117 | Methods and apparatus for estimating and adjusting the frequency response of telecommunications channels In methods and apparatus for estimating the frequency response of telecommunications channels, signals carried on the channels are divided into pluralities of signal segments of limited duration, unvoiced signal segments are identified, and spectral compo... | 11/19/1996 |
| 5533111 | System for originating and receiving telephone calls over a virtual piped connection, and specialized customer premise equipment for use in the system Access (or egress) charges payable by an IXC to a LEC, and payable by the subscriber to the LEC for originating or terminating calls and for associated vertical call control features, are reduced or eliminated by providing a virtual piped collection that ... | 07/02/1996 |
| 5402479 | Method and apparatus for translating signaling information An office interface unit (OIU) transfers data and signaling between a telephone local exchange and distribution lines. Information from the telephone local exchange is contained in repetitive frames containing signaling time slots which each contain two d... | 03/28/1995 |
| 5259027 | Dial restoral method for digital circuits A switched digital circuit is used to restore a failed dedicated digital circuit to a remote station in conjunction with reconfiguration of the network's multipoint junction units (MJU). A circuit is established over the public switched digital network fr... | 11/02/1993 |
| 5060259 | Call progress capability for a switched channel data service unit A method and apparatus is provided within an interface to data terminal equipment for obtaining call progress information. The call progress information provides relevant data as to the progress of a call initiated by the data terminal equipment. The inte... | 10/22/1991 |
| 4995076 | Call progress capability for a switched channel data service unit A means is provided within an interface to data terminal equipment for obtaining call progress information. The call progress information provides relevant data as to the progress of a call initiated by the data terminal equipment. The interface is design... | 02/19/1991 |
| 4939774 | Method for controlling a digital telephone set and a telephone set based on the same A method for controlling a digital telephone set coupled to an integrated services digital network, includes the following procedure. It is determined whether a telephone number of a destination terminal which is given by sequentially inputting digits for... | 07/03/1990 |
| 4868861 | Trunk dialing converter A digital FSK trunk dialing converter including M and E lead control is disclosed. The dialing converter further includes an FSK detector which is responsive to consecutive half period intervals of a received FSK signal, and a digital signal-to-noise (S/N... | 09/19/1989 |
| 4815124 | DX circuit An improved DX circuit may be connected to signaling and reference leads of a DX signaling link, without need to balance the internal impedance of the DX circuit against that of the external DX signaling link. The DX circuit senses the magnitude and direc... | 03/21/1989 |
| 4627046 | Programmable feature card Programmable feature card circuitry includes: a signal processor with parallel input/output (I/O) data ports and responsive to command of the PBX call processor, signal memory, and a signal interface for converting the PBX signal format to a processor com... | 12/02/1986 |
| 4075569 | Digital method and apparatus for dynamically generating an output pulse train having a desired duty cycle from an input pulse train The pulses of an output pulse train are made to conform to a desired duty cycle within the limits afforded by the individual cyclical periods of an input pulse train by digitally measuring each input cyclical period to afford a digital counting interval i... | 02/21/1978 |
| 3940570 | Apparatus for combining a central telephone trunk line with a customer telephone trunk line A system for combining a central telephone trunk line with the trunk line of a customer exchange wherein said central telephone exchange is provided with means for separating the dial, talk, and ring functions into a first partial circuit for providing a ... | 02/24/1976 |
