We are aware of this issue, this happened since the last update we pulled for MMDVMHost.
There is a small problem with the way DTMF frames are silenced when being repeated, and this causes them to *also* be silenced when passed into the network (so ircDDBGateway is not hearing them).
I am working on some fixes for MMDVMHost to remove those issues, I have a working prototype and I am testing that currently.
If this problem affects you - keep an eye on this announcement, I will post a message when the new binaries are available for use.
D-Star DTMF not being passed to ircDDBGateway
Re: D-Star DTMF not being passed to ircDDBGateway
Updated MMDVMHost posted, if this problem affected you, please update and try it...