Text telephone modem communications over packet networks
First Claim
1. A text telephone modem detection method for use by a first gateway, said first gateway being capable of communicating with a second gateway over a packet network, said method comprising:
- setting said first gateway to a voice mode having a first coding scheme;
encoding an input signal using said first coding scheme to generate a first encoded input signal, while said first gateway is in said voice mode;
transmitting said first encoded input signal to said second gateway over said packet network, while said first gateway is in said voice mode;
looking for a first tone in said input signal while said first gateway is in said voice mode, wherein said first tone is indicative of a beginning of a text telephone modem character, and wherein said text telephone modem character comprises said first tone;
detecting said first tone in said input signal while performing said looking;
setting said first gateway from said voice mode to a text telephone modem mode in response to said detecting;
providing a silence period, after a switching silence caused by said setting said first gateway from said voice mode to said text telephone modem mode, so as to prevent a detection of said first encoded input signal by said second gateway as said beginning of said text telephone modem character; and
transmitting said input signal to said second gateway over said packet network, after said silence period, according to said text telephone modem mode.
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Accused Products
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.
17 Citations
16 Claims
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1. A text telephone modem detection method for use by a first gateway, said first gateway being capable of communicating with a second gateway over a packet network, said method comprising:
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setting said first gateway to a voice mode having a first coding scheme; encoding an input signal using said first coding scheme to generate a first encoded input signal, while said first gateway is in said voice mode; transmitting said first encoded input signal to said second gateway over said packet network, while said first gateway is in said voice mode; looking for a first tone in said input signal while said first gateway is in said voice mode, wherein said first tone is indicative of a beginning of a text telephone modem character, and wherein said text telephone modem character comprises said first tone; detecting said first tone in said input signal while performing said looking; setting said first gateway from said voice mode to a text telephone modem mode in response to said detecting; providing a silence period, after a switching silence caused by said setting said first gateway from said voice mode to said text telephone modem mode, so as to prevent a detection of said first encoded input signal by said second gateway as said beginning of said text telephone modem character; and transmitting said input signal to said second gateway over said packet network, after said silence period, according to said text telephone modem mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A first gateway capable of detecting a text telephone modem, said first gateway having a voice mode and a text telephone modem mode, said first gateway being capable of communicating with a second gateway over a packet network, said first gateway comprising:
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an encoder configured to encode an input signal using a first coding scheme to generate a first encoded input signal, while said first gateway is in said voice mode; a transmitter configured to transmit said first encoded input signal to said second gateway over said packet network, while said first gateway is in said voice mode; a detector configured to look for a first tone in said input signal while said first gateway is in said voice mode, wherein said first tone is indicative of a beginning of a text telephone modem character, and wherein said text telephone modem character comprises said first tone; wherein said detector is configured to detect said first tone in said input signal while looking for said first tone, wherein said first gateway is configured from said voice mode to said text telephone modem mode in response to detecting said first tone, wherein said first gateway is configured to provide a silence period, after a switching silence caused by said configuring said first gateway from said voice mode to said text telephone modem mode, so as to prevent a detection of said first encoded input signal by said second gateway as said beginning of said text telephone modem character; and wherein said transmitter is configured to transmit said input signal to said second gateway over said packet network, after said silence period, according to said text telephone modem mode. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification