DSPGenie MTT uses onboard DSP resources to implement a range of low-speed modems used in text telephony, including those defined in the ITU-T V.18 recommendation:
V.18
V.21
V.23
Bell 103
Baudot
EDT
DTMF text
CTM
Visit the DSPG Telecom website for more information on Text Telephony Modem Tester