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| Number | Title | Issue Date |
| 7257222 | Ring voltage generation circuit and method for generating a ring voltage The present invention relates to a ring voltage generation circuit for generating a ring voltage (VTR) between a TIP lead (9) and a RING lead (10) with minimized power loss for electronic subscriber circuits, comprising: a) an amplifier circuit ... | 08/14/2007 |
| 7184529 | Method and system for connecting a subscriber to an advertiser prior to call completion A method and system are provided for connecting a subscriber to an advertiser prior to call completion in an intelligent telecommunications network. A subscriber telephone line is provisioned to receive advertisements which are stored in an originating switch in the... | 02/27/2007 |
| 7072644 | Method for providing a caller-based ringback tone sound in case of a non-subscribed called The present invention relates to a method for providing an arbitrary sound chosen by a subscriber instead of a conventional RBT, more particularly, to a method for providing a caller with an arbitrary sound chosen by the caller instead of an RBT in case that a calle... | 07/04/2006 |
| 7046755 | Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with switchable time constants A digital direct access arrangement (DAA) circuitry may be used to terminate the telephone connections at the user's end that provides a communication path for signals to and from the phone lines. Briefly described, the DAA provides a programmable means for the DC t... | 05/16/2006 |
| 6917681 | Peak power management and active decoupling arrangement for span-powered remote terminal access platforms A power management circuit for a remote access platform extracts power from a wireline for powering a ring generator that generates a ringing voltage signal that is distributed to a plurality of subscriber circuits. A power-limited voltage converter steps up the wir... | 07/12/2005 |
| 6714644 | Ringing scheduling for FXS ports on platforms with limited power supply An apparatus and method for supporting enhanced ring scheduling for devices on platforms with limited power supply while seeking to preserve caller ID information and normal ringing cadence is disclosed. The ring scheduling apparatus includes a “Line Manager” co... | 03/30/2004 |
| 6697482 | Method and system for transmitting messages to subscribers during the set-up stage of incoming telephone calls Method and system for transmitting messages to subscribers of a telephone network during the set-up stage of incoming calls prior to the off-hook from a local exchange to at least one telephone terminal through an access system. The access system simulate... | 02/24/2004 |
| 6671370 | Method and apparatus enabling a calling telephone handset to choose a ringing indication(s) to be played and/or shown at a receiving telephone handset A telephone system includes a plurality of telephone terminals wherein a call that is placed from a calling telephone terminal to a receiving telephone terminal is announced by activating a standard ringing indication at the receiving telephone terminal. ... | 12/30/2003 |
| 6522668 | System and method for special signaling with customer premises equipment A system and method are provided for special signaling with customer premises equipment. The system includes loop termination equipment coupled to a local loop and comprising a signal generator. The system also includes customer premises equipment coupled... | 02/18/2003 |
| 6088440 | Method and apparatus for operating a telephone exchange having selectable audio sources A telephone exchange transmits audible signals to a subscriber line to indicate exchange or network conditions. The audible signals to be transmitted to the subscriber line are selected from one or more available audible signal sources according to the co... | 07/11/2000 |
| 5949873 | Method of providing centrex type operation using a PBX and a central switching office A method of operating a communication switching system in conjunction with a PBX comprising: storing at the PBX equipment station identifiers in association with directory numbers, storing at the switching system the station identifiers in conjunction wit... | 09/07/1999 |
| 5920610 | System and method for updating database of customers' telephone numbers A telephone number status is rapidly and easily examined to update a telephone number list. Telephone numbers stored in a telephone number list are sequentially transmitted from an ISDN line to a telephone line in a digital communication mode for making c... | 07/06/1999 |
| 5881147 | Ring varying technique for a telephone A technique for selectively storing as a selected ring one of various rings programmed in a ROM within a controller of a telephone which has a controller for storing a program for various rings therein, an output key for confirming the stored rings, and a... | 03/09/1999 |
| 5699419 | Analog multibutton telephone keysets A keyset that connects to telephone switches via analog lines, wherein a processor in the keyset communicates with the switch via in-band signaling to provide keyset functionary. When a call comes into the switch for one of the directory numbers (DNs) ass... | 12/16/1997 |
| 5655012 | Private branch exchange apparatus In a private branch exchange apparatus having a plurality of extension ports, each extension port capable of connecting a push button telephone and a general standard type telephone in parallel, when a call occurs at one extension port where the parallel ... | 08/05/1997 |
| 5627884 | Method for returning inbound calls Caller information is automatically taken from a caller on hold, the call disconnected and the call returned at the time when the caller would have been serviced had the caller stayed on hold. The caller's number is verified and either DTMF or verbal exte... | 05/06/1997 |
| 5579386 | Telephone network alerting cadence control system An alerting cadence control system for a telephone network having a telephone exchange, subscriber transmission equipment connected to the telephone exchange, and a plurality of telephone sets each connected to the subscriber transmission equipment. The s... | 11/26/1996 |
| 5544235 | Identification of called directory number at multiple directory number per line premises prior to ringing signal reception A telecommunication network having a switching system connected to a called station by a line that provides notification to a called party of information relating to an incoming call. This information generally consists of the called number, but may also ... | 08/06/1996 |
| 5490214 | Method and apparatus for selectively generating control signals in a telephone system An improvement to a telephone system (10) having a first signal generator (21) which outputs a control signal only when it receives a certain request signal generated by the telephone system's client telephone (12). The invention contemplates a method and... | 02/06/1996 |
| 5452345 | Metering signal level control circuit An apparatus for controlling the magnitude of a metering signal used in a communication system includes a high pass filter and a threshold detector. The apparatus is preferably integrated on to a subscriber line audio-processing circuit (SLAC device) whic... | 09/19/1995 |
| 5408527 | Exchange system and method of connecting calls in said exchange system Disclosed is an exchange system, to which a plurality of extension terminals are connected, for effecting a connection to any of the extension terminals upon receiving, from a network, incoming-call information which includes at least extension terminal d... | 04/18/1995 |
| 5406623 | Method and apparatus for ringing telephone stations A telephone ringing arrangement where a non-sinusoidal ringing voltage waveform is used that has significantly longer intervals during which the waveform is near zero as compared to a sinusoidal waveform. A connect interval is defined as the time during w... | 04/11/1995 |
| 5335270 | Bell signal generating circuit A bell signal generating circuit for a key telephone set. A dc component of a pulse signal is removed by a photo-coupler to generate a first signal. A high frequency component of the first signal is removed by a filter to generate a second signal. A diffe... | 08/02/1994 |
| 5335271 | Ring trip detection circuit A ring trip detection circuit detects an OFF-hooked state of a telephone receiver during ringing of a telephone set by detecting a change in a voltage across two terminals of a transmission resistor through which a ringing signal is supplied to the teleph... | 08/02/1994 |
| 5172407 | Circuit for generating metering pulses intended for presentation to a telecommunication subscriber A circuit (4) for generating metering pulses (P) includes a multiplier circuit (MULT), a bandpass filter (BF), a comparison circuit (COMP) and a ramp signal generator (RAMP). A current (IC) from the ramp signal generator is multiplied (MULT) by an alterna... | 12/15/1992 |
| 5161180 | Call interceptor for emergency systems A device for responsively providing, in cooperative association with the 911 emergency system, the number and location of a telephone, especially a PBX extension telephone, from which such a 911 emergency call originates. A first device is installed betwe... | 11/03/1992 |
| 4995111 | Ring trip circuit for subscriber telephone An improved ring trip circuit for a subscriber telephone, for detecting an on-hook state or an off-hook state of the telephone. The ring trip circuit can be formed in a small size and can be formed by a LSI. The ring trip circuit includes a voltage detect... | 02/19/1991 |
| 4750200 | Call meter signal receiver for subscriber's private metering of telephone system A call meter signal receiver is provided for a subscriber's private metering system operated by a call meter signal sent from a central office. The receiver is operable both by common mode and normal mode signals. The receiver is small sized and can be in... | 06/07/1988 |
| 4602128 | Automatic redialing arrangement for multi-line telephone station sets The subject arrangement provides a last number dialed automatic redialing capability for each line of a multi-line telephone station set or attendant console. This is accomplished by maintaining a centralized last number dialed table on a per-line basis i... | 07/22/1986 |
| 4264786 | A.C. Signal current transmission trunk circuit for telephone exchange systems An A.C. signalling transmission trunk circuit has a single-polarity drive voltage source for controlling a pair of thyristor-switching circuits which are assigned, respectively, to a subscriber line pair. The voltage source is arranged to supply either a ... | 04/28/1981 |
| 4204094 | Tone applying line circuit A circuit for efficiently applying tones or other signals to a line circuit which has a variety of conditions such as being split from the central office, and having a telephone set connected thereto either on hook or off hook. The invention is comprised ... | 05/20/1980 |
