Support of TTY systems in voice over data networks

Details Support of TTY systems in voice over data networks Support of TTY systems in voice over data networks

2005-01-11

2005-01-11

Chan, Wing F (Department: 2643)

Telephonic communications

Including aid for handicapped user

C370S352000

Reexamination Certificate

active

06842503

ABSTRACT:
A network device for transmitting TTY data across a data network has a PSTN port for receiving PSTN signals and a demodulator for demodulating the PSTN signals into digital data. A processor detects a suspected start bit for TTY data and buffers voice packets while it parses the following data. If the start bit is valid, the buffered data is discarded and the processor packetizes and transmits the TTY data through a data port.A network device for receiving TTY data extracts TTY data from an incoming data packet stream. The TTY data is then remodulated into PSTN signals and transmitted to the PSTN via a PSTN port.

REFERENCES:
patent: 6611804 (2003-08-01), Dorbecker et al.
patent: 20040008667 (2004-01-01), Michaelis
ITU T (Telecommunication Standardization Sector of ITU) H.323 (Nov. 2000) Series H: Audiovisual and Multimedia Systems, Infrastructure of audiovisual services—Systems and terminal equipment for audiovisual services, “Packet-based multimedia communications systems” (242 pages).

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