Text telephone modem communications over packet networks

Details Text telephone modem communications over packet networks Text telephone modem communications over packet networks

2005-01-13

2008-08-12

Pham, Chi H. (Department: 2616)

Multiplex communications

Pathfinding or routing

Combined circuit switching and packet switching

C370S401000, C375S222000, C379S052000, C379S093010, C379S093080

Reexamination Certificate

active

07411941

ABSTRACT:
A modem detection method is provided for use by a first gateway, the first gateway capable of communicating with a second gateway over a packet network. The method comprises setting the first gateway to a voice mode having a first coding scheme, encoding an input signal using the first coding scheme to generate a first encoded input signal, transmitting the first encoded input signal to the second gateway over the packet network, looking for a first tone in the input signal while the first gateway is in the voice mode, wherein the first tone is indicative of a beginning of a character, detecting the first tone in the input signal; setting the first gateway from the voice mode to a modem mode in response to the detecting; and transmitting the input signal to the second gateway according to the modem mode.

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