Apparatus and method for controlling incoming melody

Apparatus and method for controlling incoming melody

Apparatus and method for determining a minimal time bound...

Apparatus and method for determining the state of a telephone li

Apparatus and method for dialing out of local area telephone cal

Apparatus and method for dialing out of local area telephone...

Apparatus and method for dual tone multifrequency signal detecti

Apparatus and method for filtering voiceband and metering...

Apparatus and method for finding a called party over a...

Apparatus and method for identifying speech and call-progression

Apparatus and method for inputting alphabet characters on...

Apparatus and method for noise immunity during signal detection

Apparatus and method for providing a telephone user with control

Apparatus and method for recording incoming call information

Apparatus and method for supervising derived channel communicati

Apparatus and method for telephone, intercom, and clock

Apparatus and method to detect telephony signaling states

Apparatus and method to insert the default local area code...

Apparatus and methods for electrical signal discrimination

Apparatus and robust method for detecting tones