Well, I am glad to know that the responder will work with DSL service. However, in my case something else must be killing the touch tones, and they are being interfered with BEFORE they get to the transponder. I have a wall filter, which has an unfiltered port which goes to the modem, and a filtered output going to the phone. However, every other wall plate in the house is unfiltered, unless I put a single output filter on it, which I did in the case of the wall plate going to the responder.
As I stated above, without the filter, the responder does not hear the touch tones at all, and with the filter, it hears ONLY the tones from the phone within the home. It still does not hear tones from OUTSIDE the home, dialing in -- which of course, is what is needed to control the responder when away.
Any other suggestions as to places to look for the problem will be appreciated.