4. Telephonic communications
  5. Centralized switching system
  6. Structure of equipment

Chunsheng Xie

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Enabling incoming VoIP calls behind a network firewall

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Reexamination Certificate

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Signaling switch for use in information protocol telephony

Telephonic communications – Centralized switching system – Structure of equipment
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Profile ID: LFUS-PAI-P-2852210

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