TTY communication over packet networks

Details TTY communication over packet networks TTY communication over packet networks

2007-02-13

2007-02-13

Woo, Stella (Department: 2614)

Telephonic communications

Including aid for handicapped user

C379S090010, C375S352000

Reexamination Certificate

active

11050049

ABSTRACT:
A system to enable TTY communication between a legacy TTY phone and an IP phone over a packet network using a TTY relay protocol established between the IP phone and a media gateway at a central office of the PSTN. The system may also use a voice over Internet Protocol gateway to connect a personal computer to the packet network instead of an IP phone to accomplish TTY communication between software on the computer and a legacy TTY phone.

REFERENCES:
patent: 6421425 (2002-07-01), Bossi et al.
patent: 6842503 (2005-01-01), Wildfeuer
patent: 2003/0076815 (2003-04-01), Miller et al.
patent: 2004/0008667 (2004-01-01), Michaelis
patent: 2004/0196961 (2004-10-01), Freundlich et al.
patent: 2004/0228325 (2004-11-01), Hepworth et al.
patent: 2005/0195801 (2005-09-01), Chu et al.
patent: 2006/0007916 (2006-01-01), Jones et al.

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