[ducasi]

Off the top of my head... a wee shell script in /etc/rc1.d/ or similar... Call it "S99.modem-config". (The "99" might need to be smaller to get this to run before the rest of the network stuff...)

(The proper way of doing this is to put the script in /etc/init.d/ and run update-rc.d, but I'm going to ignore that...)

Here's a quick hacked-up script...

#! /bin/sh -

# what we're talking to...
MODEM=/dev/ttya

exec >$MODEM <$MODEM

function echook() {
  echo "$@"
  sleep 2
  read a
  test "$a" == "OK"
}


while true
  do
    sleep 60
    echook "AT1111" || continue
    sleep 10
    echook "AT2222" || continue
    sleep 10
    echook "AT3333" || continue
    break
  done

Some tweaking, maybe a "stty" or two, but that is all that you really need...

Hope this helps...