4. Telephonic communications
  5. Supervisory or control line signaling
  6. Using line or loop condition detection

3Com Corp.

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Method and apparatus for detecting multiple telephone...

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Reexamination Certificate

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System and method for using a portable information device to...

Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
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