On Thu, 16 Apr 1998, Gert Doering wrote: > For some applications this will be enough, for others, not. But most non-ISDN modems, when being called, can hang up and re-start at any time, at least it's how it works in CH. ISDN modems, even when in voice mode, seem to send a LINK TERMINATE or something similar to your central -> BUSY tone.