DTMF not working with AWV on 5000 Posted on September 19, 2014March 19, 2020 by Paul Just installed latest MAS 6 with a 5000. Unable to use the AWV as DTMF had no effect when dialing in. Mitel advised us to change DTMF Decoding Payload setting within IP Settings from 101 to 96, then reboot the system. This worked. Share this:Click to email a link to a friend (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Reddit (Opens in new window)Like this:Like Loading...