Patent ID: 7397772

Claim:
A method for canceling acoustic echo generated from a public switched telephone network (PSTN) during transmission of text information from a base station (BS) to the PSTN in a communication system having the BS, a mobile station (MS) connected wirelessly to the BS, having a teletype/telecommunications device for the deaf (TTY/TDD) device for transmitting and receiving text information, the PSTN, a mobile switching center (MSC) for connecting the BS to the PSTN, and a land phone connected to the PSTN by cable, the method comprising: determining whether a data signal is inputted from the MS, the data signal is transmitted to the BS, and the transmitted data signal comprises text information, when a call between the MS and the land phone is set and the data signal is Generated from the TTY/TDD device; generating a blank packet including silence information in the BS if the text information is detected in the transmitted data signal; and transmitting the blank packet to the TTY/TDD device of the MS for canceling acoustic echo generated from the land phone.