4. Telephonic communications
  5. Centralized switching system
  6. 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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