Device and method for maintaining a telephone call during...

Multiplex communications – Fault recovery – Bypass an inoperative channel

Reexamination Certificate

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Details

C370S259000, C379S212010, C379S221040

Reexamination Certificate

active

07852755

ABSTRACT:
A communication device comprises a first transmitter configured to transmit a telephone signal via a broadband-communication link to an IP network, and a second transmitter configured to transmit a telephone signal via an alternative communication link to a telephone network. The telephone signal is transferred from a first telephone number for identifying the communication device in the transmission of the telephone signal via the broadband-communication link to a second telephone number associated with the alternative communication link when a power failure occurs during a transmission of the telephone signal via the broadband-communication link.

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Handley et al. “SIP: Session Initiation Protocol.”IETF RFC 2543. Mar. 1999. http://tools.ietf.org/html/rfc2543 (8 pages).

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