Yes, that will work.   The code for DTMF relax is applied lower in the stack (main/dsp.c) so it applies to all channel drivers.

so on DIAL:

in /usr/src/astsrc-1.4.23-pre/asterisk/menuselect.makeopts
Remove RADIO_RELAX from the MENUSELECT_CFLAGS line, leaving:
MENUSELECT_CFLAGS=LOADABLE_MODULES

Then recompile:

cd /usr/src/astsrc-1.4.23-pre/asterisk
./configure
make
make install

> On Nov 9, 2016, at 10:56 AM, James Cizek <james.m.cizek@gmail.com> wrote:
>
> Hi folks,
>
> We are having a TON of voice conversations being false DTMF decoded on our repeaters (all RTCM and running DIAL on the PCs).  Looking through archives and instructions, it looks like radio_relax could be turned off to help with this.   I can't seem to find info on if this setting works with chan_voter or just the usb dongle channel driver.  Can anyone confirm or deny that?
>
> Over the last 4 days, logs indicate over 3500 DTMF chars per day being decoded.  It's pretty annoying listening to the conversations with all the little chunks of audio that are silenced when it falsely decodes a character!
>
> Thanks for any insight.
>
> James
> KI0KN