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Integrated ringer relay circuit and method

Telephonic communications – Centralized switching system – With generating of call associated substation signal
Patent

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Method and an arrangement for generating a ringing signal

Telephonic communications – Centralized switching system – With generating of call associated substation signal
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Method and apparatus for operating a telephone exchange having s

Telephonic communications – Centralized switching system – With generating of call associated substation signal
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Method and apparatus for selectively generating control signals

Telephonic communications – Centralized switching system – With generating of call associated substation signal
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Method and apparatus for sending alerts to internet protocol...

Telephonic communications – Centralized switching system – With generating of call associated substation signal
Reexamination Certificate

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Method for realizing ring back tone in communication system

Telephonic communications – Centralized switching system – With generating of call associated substation signal
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Method of automatic equalized distribution of ring loads for tel

Telephonic communications – Centralized switching system – With generating of call associated substation signal
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Method to reduce distortion of a digital data signal by a...

Telephonic communications – Centralized switching system – With generating of call associated substation signal
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Monolithically integratable telephone circuit for supplying ring

Telephonic communications – Centralized switching system – With generating of call associated substation signal
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Monolithically integratable telephone circuit for supplying ring

Telephonic communications – Centralized switching system – With generating of call associated substation signal
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Personal branch exchange system

Telephonic communications – Centralized switching system – With generating of call associated substation signal
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Power amplifier

Telephonic communications – Centralized switching system – With generating of call associated substation signal
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Programmable call progress tones for a switching system

Telephonic communications – Centralized switching system – With generating of call associated substation signal
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Programmable ring signal generator

Telephonic communications – Centralized switching system – With generating of call associated substation signal
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Ringback tone service opt-in and opt-out requests for use by...

Telephonic communications – Centralized switching system – With generating of call associated substation signal
Reexamination Certificate

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Ringing signal control circuit capable of suppressing surge volt

Telephonic communications – Centralized switching system – With generating of call associated substation signal
Patent

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Ringing signal sending-out circuit

Telephonic communications – Centralized switching system – With generating of call associated substation signal
Patent

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Solid state ringing switch

Telephonic communications – Centralized switching system – With generating of call associated substation signal
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Splitter for analog telephone signal and digital data

Telephonic communications – Centralized switching system – With generating of call associated substation signal
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Subscriber apparatus with ringer generator for sending ringer si

Telephonic communications – Centralized switching system – With generating of call associated substation signal
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