Providing call backup of voice over internet protocol (VoIP)...

Details Providing call backup of voice over internet protocol (VoIP)... Providing call backup of voice over internet protocol (VoIP)...

2004-12-03

2009-12-22

Elahee, MD S (Department: 2614)

Telephonic communications

Special services

Service trigger

C379S029070, C379S207070, C379S207080, C379S418000, C379S424000, C379S448000, C370S352000

Reexamination Certificate

active

07636429

ABSTRACT:
In providing call backup of a VoIP terminal, where the VoIP terminal connected to a VoIP network is automatically provided with a PSTN backup function, the on the hook state is deferred for a predetermined time period even when the on the hook state is required to be performed while a user makes an urgent communication, and a ring tone signal transmitted from a PSTN can be detected even when the telephone connected to the VoIP terminal is in a VoIP mode state. Simultaneously, the telephone connected to the VoIP terminal senses the hook state of the telephone in the state of the PSTN, and can be automatically connected to the VoIP network upon the VoIP terminal being on the hook.

REFERENCES:
patent: 6614786 (2003-09-01), Byers
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patent: 2004/0022237 (2004-02-01), Elliott et al.
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patent: 2004/0037265 (2004-02-01), Huang et al.
patent: 2004/0052242 (2004-03-01), Laturell
patent: 2004/0052350 (2004-03-01), Jaroker
patent: 2005/0053051 (2005-03-01), Beyda et al.
patent: 9-65429 (1997-03-01), None
patent: 2001-217929 (2001-08-01), None
patent: 2004-15755 (2004-01-01), None
Japanese Office Action corresponding to Japanese Patent Application No. 2005-024949, issued on Dec. 19, 2006.

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