Matches 1 - 50 out of 106 1 2 3 >
Match Document Document Title
6263059 Communication apparatus and storage medium  
A communication apparatus is provided for communicating with an external device. The communication apparatus may be a facsimile machine which includes a main phone, and a plurality of secondary...
6222913 Method and apparatus for displaying caller information during call switching in private branch exchange  
An exchange system displays caller information on the display of a subscriber terminal during call switching. The exchange system includes a plurality of extension terminals, each having a display,...
6169792 Method and apparatus for implementing automatic number identification system for DAA  
The present invention provides apparatus and method for automatic number identification (ANI) for a data access arrangement (DAA) of a modem. Modems or telephones equipped with an ANI system use...
5905786 Console and extension telephone system  
A system and method for altering an incoming ring signal to produce a selected ring signal on a telephone device. The incoming ring signal is accompanied by a caller ID packet and provided by a...
5822417 Phone control center for a life safety network  
There is provided a phone control system for a life safety network which comprises a panel arrangement, a control center module, a loop controller module, a transponder and a remote handset. The...
5805680 Method and apparatus for telephone call sub-billing  
A "breakout" of telecommunications toll calls on a per-station basis is provided to households or other telecommunications endpoints which have subscribed to only a single analog telephone line....
5745557 CIDCW primary/secondary arbitration  
A system is disclosed allowing a plurality of conforming customer premise equipment ("CCPEs") on a single telephone line to display a third party's caller information while users are communicating...
5592540 Method and apparatus for selectively delivering telephony signals on a hybrid coaxial cable network  
An interdiction device and method to jam or delete selected video and telephony signals. The interdiction device includes amplifiers and forward couplers to prevent the telephony signals from...
5425089 Low cost telephone caller identification device and method  
The device and method of the present invention characterizes a telephone call by identifying a code, comparing the code to a predetermined access/ID code and generating a signal in response to the...
5386463 Low noise multi-elevator communication system and method  
A system is provided for connecting multiple elevator (700-703) speaker/microphone pairs (114a-114d) to a remote terminal (750) via a standard telephone channel (50). The system comprises...
5267306 Telephone apparatus with conditional operation  
A dial controllable conditionally operative device which is directly connectable to the ring and tip lines of a subscriber loop. "On-hook" coupling is provided to allow the device to provide the...
4958370 Control system for a plurality of telephone sets  
A control system for a plurality of telephone sets connected as branched to a central office line allows extension calling, privacy function setting and hold releasing operations between the...
4862495 Telecommunications subscriber line interface circuit and party identification facility  
The invention provides a tip party identification facility in association with a subscriber line interface circuit. The tip party identification facility takes advantage of a shutdown feature and...
4741024 Selective ringing circuit for a telephone  
A selective ringing circuit for a telephone line includes a rectifier which is normally connected to the telephone line for rectifying the AC ringing and other signals. The rectified ringing...
4686700 Telephone off-hook detector circuit  
A circuit for connection into a telephone line for detecting when a telephone instrument has gone off-hook and which is unaffected by the presence of a ringing signal on the telephone line. The...
4669112 Automatic telephone number indicating device  
An automatic telephone number indicating device for connection within the tip or ring line of a telephone circuit of one party of a multi-party circuit for applying a ground mark in response to an...
4653089 Personal telephone adapter  
A personal telephone adapter is disclosed which may be connected as an extension on a telephone line and which permits a caller to reach any of several extension telephones within a home or office...
4645877 Interface for connecting standard telephones to party lines  
A party line interface for permitting the connection of a standard telephone to a telephone central office which rings selected subscribers by applying a DC ringing potential of a selected polarity...
4528424 Multiparty line adapter with privacy feature controlled by reversal of line polarity at a central power source  
A circuit for adapting a telephone subscriber line to operate as a multiparty line is described wherein a plurality of conventional single line subscriber subsets are provided telephone service on...
4459433 Station identification circuit arrangement  
A universal station identification circuit arrangement for use with central office equipment that utilizes either differential or longitudinal detection methods is adapted to be connected to the...
4445001 Circuit arrangement for identifying telephone subscribers  
A request generator, when operated by a telephone subscriber or by a processor at an exchange, briefly interrupts an established talking connection to send a trigger signal toward a participating...
4403115 Station identification circuit arrangement  
A universal station identification circuit arrangement for use with central office equipment that utilizes either differential or longitudinal detection methods is adapted to be connected to the...
4371755 Bridge lifter circuit  
The tip and ring leads (15,17) of a tip party transmission facility are reversed before connecting the separate channel units for the tip and ring party channels to bridge lifters (16,18) at the...
4324953 Four-party automatic number identification circuit arrangements  
A station identification circuit arrangement for use with central office equipment that utilizes automatic detection equipment for the detection of one of four parties on a four party-line where a...
4209667 Subscriber drop-connected circuits  
A unit adapted to be connected to the tip party's subscriber's drop in a two-party line without requiring access to or rewiring of the tip party's telephone and having interconnected ringer...
4149040 Identifier circuit for identifying party line subscribers  
An identifier circuit for connection between a telephone system party line and a party line subscriber to permit identification of a calling party line subscriber with automatic number identifying...
4099031 Method and apparatus for automatically identifying an individual calling party on a multiparty telephone line  
After description of a number of prior art automatic telephone number identification systems and certain problems associated therewith, a new method and apparatus for use in such systems which...
4079205 Automatic number identification device  
An automatic number identification device is used in a telephone system to enable a telephone central office to identify from which of two parties on a two party telephone service a call is...
4064372 Systems for and methods for PBX toll restriction  
Centralized toll restriction for private branch exchanges (PBXs) is performed by providing first and second memory addresses in the number translator of a central office switching system. The first...
4056690 Automatic number identification in subscriber loop carrier systems  
A subscriber loop carrier system using digital transmission techniques is disclosed in which remote subscriber loops include two-party lines equipped for automatic number identification. The...
4054942 Tip automatic number identification circuit  
A circuit for identifying which one of two parties has initiated a toll call. Circuitry connected to the subscriber drop of one party, e.g., the tip party of a two-party telephone line, generates a...
4001512 Automatic telephone number identification circuit  
An identification circuit, which is useful in a communication system comprising a plurality of remote stations and one central station, for automatically distinguishing between two remote stations...
3974342 Switching arrangement for telecommunications systems  
A circuit arrangement for identifying one of two or more subscriber sets connected to a common trunk over branch circuits is described. A parallel arrangement of a capacitor and a threshold diode...
3959598 Identification forwarding circuit for use with tone-to-pulse converters  
A circuit for making existing automatic number identification (ANI) equipment in a telephone central office compatible with multifrequency tone telephone using tone-to-pulse converters. In a...
3939308 Electronic side of line detector  
A side of line detector with a single operational amplifier with adjustable output. The amplifier input is protected from positive and negative voltage spikes by diodes. Two transistors are coupled...
3927270 Automatic number identification having four-party detection  
An automatic number identification system in a tributary office having simultaneous dual operation for high traffic capacity. An identifier unit applying identification signals via a sleeve lead...
3862374 CALLING STATION IDENTIFIER-SENDER  
An identifier-sender for the incorporation of Automatic Number Identification (ANI) in a telephone or other communication system, including a transmitter, comprising an encoding matrix, capable of...
3855420 SUPERVISORY CIRCUIT  
A supervisory circuit in a telephone switching system includes two current sensing transistors, each adapted to detect current flow in alternate directions through a subscriber's loop serving one...
3760112 PARTY AND COIN DETECTION ARRANGEMENT FOR A COMMUNICATION SWITCHING SYSTEM  
A register-sender common control communication switching system having a plurality of registers sharing common memory and logic circuits on a time division multiplex basis and having a plurality of...
3688050 TELEPHONE SET IDENTIFICATION SYSTEM USING REVERSE POLARITY INTERROGATION SIGNAL  
A telephone set identification system wherein telephones are equipped with circuits that are responsive to a reversal of the battery potential from the central office (when the telephone is off...
3676602 TELEPHONE SET IDENTIFICATION SYSTEM  
A telephone set identification system wherein telephones are equipped with circuits that are responsive to a high potential signal from the central office (when the telephone is off hook) to...
3673330 TWO-PARTY AUTOMATIC NUMBER IDENTIFICATION IN SUBSCRIBER CARRIER TELEPHONE SYSTEM  
Automatic number identification for two subscribers who share a single channel in a subscriber carrier system. A d.c. ground connection is made to the subset of one of the two subscribers but not...
3594517 VERIFIER FOR WIRING OF NUMBER IDENTIFIERS  
A device for verifying the core panel wiring of identifier equipment for direct-dial long distance telephone equipment comprising plurality of lamps connected through two groups of relays to the...
3579254 CALLING SUBSCRIBER PARTY LINE IDENTIFICATION CIRCUIT  
One party on a two-party line is connected in series with a diode circuit across the tip and ring lines. The diodes have a breakdown voltage above the level of AC tone from a central office and the...
3522385 CALLING SUBSCRIBER IDENTIFICATION CIRCUIT  
3433901 APPARATUS FOR CONTROLLING THE ESTABLISHMENT OF CALL CONNECTIONS IN A DISTRIBUTED LINE CONCENTRATOR SYSTEM  
3415953 Calling-party identification system for party-line telephone exchanges  
3389229 Telephone subscriber line concentrating system  
3339028 Arrangements for detecting ground conditions on telephone lines  
3320367 Telephone line circuit  
Matches 1 - 50 out of 106 1 2 3 >