Patent ID: 8031842
Filing Date: 2011-10-04
Classification: H04M

Abstract:
1. A communication method, comprising: a first modem receiving a first carrier tone-based text stream from a first TTY device, the first carrier tone-based text stream being defined by a first transmission protocol; the first modem converting the first carrier tone-based text stream into a data stream, the data stream being defined by a second transmission protocol different from the first transmission protocol; the first modem transmitting the data stream to a second modem; the second modem converting the data stream to a second carrier tone-based text stream, the second carrier tone-based text stream being defined by the first transmission protocol; transmitting the second carrier tone-based text stream to a second TTY device, wherein the first and second TTY devices are connected, via the first and second modems, to effect a phone call between a first user of the first TTY device and a second user of the second TTY device, wherein the first and second modems are part of a common enterprise network, wherein the second transmission protocol is not carrier tone-based, wherein the carrier tone between the first TTY device and first modem is interrupted during a selected time interval; and during the selected time interval, the second modem maintaining a continuous carrier tone with the second TTY device.