OK DTMF is working. I had to set it to inband audio since rfc2833 doesn't seem to be working with callcentric and my setup. The PBX seems to be talking to the voice system and everything seems to work OK.
Reading through the manual I see a nice feature that will really make my life better.
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko