Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
March 24, 2009
Patent Application Number
10835819
Date Filed
April 30, 2004
Patent Citations Received
Patent Primary Examiner
Patent abstract
A telephony interface system has a controller and multiple communication interfaces to provide voice-over-packet (VoP) telephone service with PSTN telephone service as backup. The telephony interface system has a communication interface for at least one telephony device, a communication interface for the PSTN, and a communication interface for a packet-switched network. To originate a call, the telephony interface system connects the telephony device to the PSTN if the dialed digits for the call correspond to a predetermined telephone number or numbers, such as 911. Otherwise, the telephone interface system connects the telephony device to the packet-switched network.
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