You said:
 DW> You might try ATX0H1,H0,DT*70;|~~~ATH0,X4A| which should also give you
 DW> the correct sequence more or less.
 DC> I've tried something like that, and you need D to use the commas.
 DC> (They're dialer mods.)
Hmmm...  worked here when I tried it.
 DC> The only problem is that it gives a two-second flash on my modem,
 DC> and this is an effective way to hang up on an incoming call.
It was longer than the usual half second, but it was not enough for me to 
lose the line.
-dw
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