TTY test
This test allows you to test the Dialogic® Diva® Media Board and Dialogic® Diva® TTY interface functionality and link integrity using various bearer protocols supported by your Diva Media Board.
The /usr/lib/opendiva/divas/tty_test utility is located in the /usr/lib/opendiva/divas directory. On the server side, type: /usr/lib/opendiva/divas/tty_test 1 s auto. On the client side, type: /usr/lib/opendiva/divas/tty_test 2 <ISDNnumber> x75 
[4]. The transfer rate will appear in real time and be updated every time 64 Kbytes of data have been transferred.
Many other options, e.g., bearer protocol, packet size, rate adaptation, are available for the TTY test. Type /usr/lib/opendiva/divas/tty_test for a full list or refer to the section tty_test utility in this document.