> Most, if not all, modems require a break of a second or so either side
> of the escape string. Without this they will ignore it, so a +++
> mid-stream shouldn't have any effect.
Incorrect, this is not a standard. The guard time around the escape
sequence is patented by Hayes [1]. So other modem manufacturer either have
to license the technology or (more often) do without it.
Lourdes
1. Hayes Improved Escape Sequence with Guard Time (U.S. Patent #4,549,302).
Don't ask me how such a thing could be patented, I think it's the craziest
thing I ever heard but the patent office disagrees.
http://www.hayes.com/techsupport/techref/00000016.htm
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