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System for providing pots splitters externally with respect...

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Reexamination Certificate

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System for providing universal cross-connect connectivity in...

Telephonic communications – Subscriber line or transmission line interface – Network interface device
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System identification method and apparatus by adaptive filter

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Systems and methods for interfacing telephony devices with...

Telephonic communications – Subscriber line or transmission line interface – Network interface device
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Systems and methods for managing digital subscriber line...

Telephonic communications – Subscriber line or transmission line interface – Network interface device
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Systems and methods for passing through alternative network...

Telephonic communications – Subscriber line or transmission line interface – Network interface device
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Systems and methods for providing application services

Telephonic communications – Subscriber line or transmission line interface – Network interface device
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T1 channel bank control process and apparatus

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Technique for reducing echoes in conference communications

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Telecommunication line circuit

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Telecommunications apparatus and plug-in unit for same

Telephonic communications – Subscriber line or transmission line interface – Network interface device
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Telecommunications chassis and card

Telephonic communications – Subscriber line or transmission line interface – Network interface device
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Telecommunications system, an automatic branch exchange, a line

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Telephone battery feed circuit including noise reduction circuit

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Telephone circuit using DC blocked transformer and negative impe

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Telephone headset interface circuit

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Telephone headset interface circuit

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Telephone line interface circuit

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Telephone line sourced power supply

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Telephone network speech signal enhancement

Telephonic communications – Subscriber line or transmission line interface – Network interface device
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