Is this only on the new units? I have been using the dry contact (blue wires on the old units) to tie into C4 and Elan systems for triggering a chime through the DA. This has been more reliable than using the API/driver to trigger. I have not had any calls about this. We have the first of the new units going into an Elan system in a few months. I will test it out of course before deploying it.