The V.34 fax support can be activated via Global Dialogic® Diva® TTY configuration options. If the Dialogic® Diva® Media Board is able to establish a connection with a transmission speed higher than 14400 bps (V.34), it handles this transparent to the application. In order to avoid incompatibility with FAX CLASS 2 applications, the Diva Media Board never indicates transmission speeds higher than 14400 bps to the application. This means that transmission speeds higher than 14400 bps are mapped to 14400 bps.
You can use the "divalogd" accounting utility that uses the Diva Media Board Management interface to get information on the real transmission speed and the used compression algorithm.