W�rm wrote:
> There is *one* possibility beyond the obvious
> however...which is that someone send you the string
> "+++ATDT[number]" - a common attack on
> internet...stupid modems will receive commands from
> anyone...sad really.
Maybe something like S2=128 in the init string, something to prevent +++ from
putting the modem in command mode?
Would a string like "+++ATDT[number]" or "+++ATH0" have effect on receiving or
only on sending? With me, the latter quoted string would hang me up on sending
from DOS, not sure about receiving, would not hang me up under OS/2 TCP/IP. But
I include S2=128 in my init string (Diamond SupraExpress 56i ISA modem) as a
safeguard. Then neither of the two quoted strings would have any special
effect, sending or receiving. I met the second of these quoted strings in one
news message, in the headers in a line beginning with something like X-Hangup,
but it didn't hang me up, I just barely took notice.
>From previous threads on this list and on linux-ppp list, +++ puts Hayes modem
in command mode only if preceded and followed by a tiny pause, but this
safeguard didn't exist in other modems due to Hayes copyright. With my Diamond
modem, S2=n in init string, where n is an integer from 0 to 255, makes the
character having ASCII value n the escape character, where three successive
occurrences put the online modem in command mode. Default is 43 (+ is
ASCII 43). n >= 128 disables this feature. So either of the two quoted
strings has no special effect with this safeguard in place.
Sam Heywood, maybe you could try sending a message with +++ATDT followed by a
phone number just to see/hear if something happens? I think dialing the phone
when the phone is in use, connected, has no effect on current connection?
