6string, did you happen to talk to Joe at Tadiran, he is pretty much the only one I will talk to on ICE issues.

I was also having a similar issue on a couple other systems I am starting to wonder if it has to do with some of these carriers using voip technology and it confusing the DTMF like you said.

www.tspa.us
Tri-State Voice and Data Servicing Tadiran, Nortel, and Avaya; in Pittsburgh and surrounding areas.