Communications

Telephonic Communications

Signal Reception At Substation

No:6173054

Adaptive call progress tone detection system

No:5535271

Apparatus and method for dual tone multifrequency signal detection

No:6728367

Apparatus and method for filtering voiceband and metering tone frequencies of a mixed voice/data signal

No:5638421

Apparatus and method for incoming call detection and alarm circuitry for cellular telephones

No:7236585

Apparatus and method for noise immunity during signal detection

No:5796810

Apparatus for dialing of caller id block code and receiving call waiting caller-id-signal

No:6091803

Architecture for robust voice cti

No:5724420

Automatic call distribution with answer machine detection apparatus and method

No:6246761

Automatic volume control for a telephone ringer

No:7110529

Bookmarking method and apparatus for an electronic phone book

No:4935958

Busy/no-answer call completion equipment

No:6320923

Bwr jet pump wedge keeper

No:5940378

Call control in exchange suitable for intelligent network

No:5483593

Call progress decoder for multiple cadenced tones on telephone lines

No:6243461

Caller-identification receiving apparatus

No:4496797

Circuit for automatically connecting and disconnecting a speakerphone to a telephone line

No:6157954

Communication control device including business card database with associated business card agents for controlling communicated electronic mail between user and card provider

No:5796815

Communications device with improved ring signal detection

No:5937058

Coordinating telephones or adjuncts on the same loop

No:6393124

Cpe alert signal tone detector

No:6587559

Cross-frame dual tone multifrequency detector

No:7124313

Data processing device and method of controlling power consumption in back-light in data processing device

No:3899640

Device for blocking toll calls from subscriber telephones

No:5563942

Digital call progress tone detection method with programmable digital call progress tone detector

No:5910906

Digital single-frequency tone detection in presence of aliases

No:5428680

Dtmf signal receiving apparatus equipped with a dtmf signal judging circuit

No:7184542

Dtmf tone detection

No:5802166

Dual signal triggered message waiting notification system for indicating storage of different types of messages awaiting retrieval

No:6999581

Event detection circuit

No:5479501

Far-end disconnect detector for telephony systems

No:7142664

Intelligent multimode message alerts

No:5764758

Interrupted tone converter

No:4415774

Line powered modem automatic answer device powered from equipment

No:3591728

Local ringing and ring-trip relay for carrier terminal

No:5664008

Message waiting adjunct device

No:6031899

Method and apparatus for identifying type of call

No:5901210

Method and apparatus for implementing automatic number identification system for daa

No:7088817

Method and apparatus for performing high-density dtmf, mf-r1, mf-r2 detection

No:4551581

Method and apparatus for sending a data message to a selected station during a silent interval between ringing

No:5519774

Method and system for detecting at a selected station an alerting signal in the presence of speech

No:6628779

Method and system for scaleable near-end speech cancellation for tip and ring tone signal detectors

No:5023906

Method for monitoring telephone call progress

No:6574335

Method for simulating a ring back for a call between parties in different communication networks

No:6937716

Method of automatically changing a calling mode of telephone as timer setting changes

No:5995595

Method of sharing and transferring information between isdn telephones

No:4656318

Modem with power-off ring detection

No:6996228

Motor for generating vibrational signal

No:5825852

Multisensing circuitry for class signals and stutter dial tone in visual message waiting indicator

No:5588054

Power conservation system for a modem in a computer system

No:6044148

Pre-ring caller identification apparatus and method and call screening therefrom