LandOfFree - US Patents - Listing for Telephonic communications

Telephonic communications – Subscriber line or transmission line interface

Current sensing echo cancellation device

Telephonic communications – Supervisory or control line signaling – Substation originated

Current source and off-hook detector

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

Current supply circuit

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Current switch for use in telephony systems or the like

Telephonic communications – Subscriber line or transmission line interface – Hybrid circuit

Current-mode differential active hybrid circuit

Telephonic communications – Special services – Service trigger

Custom ringtones for wireline telephones

Telephonic communications – Plural exchange network or interconnection – With interexchange network routing

Custom routing for multiple carrier interconnection

Telephonic communications – Plural exchange network or interconnection – With interexchange network routing

Custom routing for multiple carrier interconnection

Telephonic communications – Supervisory or control line signaling – Substation originated

Custom telephone

Telephonic communications – Audio message storage – retrieval – or synthesis

Customer account online servicing system

Telephonic communications – Telephone line or system combined with diverse electrical... – Credit authorization

Customer activation system

Telephonic communications – Centralized switching system – Call distribution to operator

Customer automated response system

Telephonic communications – With usage measurement – Call traffic recording by computer or control processor

Customer billing relationships software

Telephonic communications – Subscriber line or transmission line interface – Protective circuit

Customer bridge module

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal

Customer bridge with indicators for diagnosing electrical connec

Telephonic communications – Centralized switching system – Call distribution to operator

Customer communication service system

Telephonic communications – Centralized switching system – Call distribution to operator

Customer communication service system

Telephonic communications – Special services – Anonymous party

Customer controlled service mediation management

Telephonic communications – Special services – Reserved call

Customer definable integrated voice/data call transfer technique