4. Telephonic communications
  5. Supervisory or control line signaling
  6. Substation originated

Sara Bern

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Communication network

Telephonic communications – Special services – Service trigger
Reexamination Certificate

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Method and system for detecting the state of dialing a...

Telephonic communications – Supervisory or control line signaling – Substation originated
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2135284

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