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#!/bin/sh
###################################################################
#
# Script to dial the remote system, negotiate the connection, and send
# it the id. Then wait for the modem to disconnect. Reset the modem
# to answer mode and wait for the system to call back.
#
# The telephone number and modempass are used when establishing the
# connection to the modem.
#
PHONE=555-1212
MODEMPASS=modem_identifier
#
# Once the modem calls back, the account name and password are used for
# a UNIX style login operation.
#
ACCOUNT=my_account_name
PASSWORD=my_password
###################################################################
#
# Step 1. Dial the modem and negotiate the initial dialog.
# note: the modem is configured to ignore loss of DCD at this point.
# it is important that this be performed because the loss of DCD
# will normally prevent system from working since 'modem' is used
# for pppd.
#
# The script is terminated normally when the carrier is lost.
#
chat -v \
TIMEOUT 3 \
ABORT '\nBUSY\r' \
ABORT '\nNO ANSWER\r' \
ABORT '\nRINGING\r\n\r\nRINGING\r' \
'' AT \
'OK-+++\c-OK' 'AT&C0&D2S0=0H0 \
TIMEOUT 30 \
OK ATDT$TELEPHONE \
CONNECT '' \
assword: $MODEMPASS \
"\nNO CARRIER\r"
if [ "$?" = "0" ]; then
###################################################################
#
# Step 2. Wait for the call back from the remote. This will wait for at most
# 30 seconds for the call back should the first attempt fail or
# something happen with the callback logic at the remote.
#
# note: when the callback occurs, the DCD setting is re-enabled.
#
# If some voice call should happen during this period, the system will
# answer the telephone and then hang up on them. I realize that this is
# rude, but there is little that this script can do.
#
chat -v \
TIMEOUT 30 \
ABORT '\nVOICE\r' \
'\nRING\r' 'AT&C1A' \
CONNECT '' \
TIMEOUT 10 \
ogin:--ogin: $ACCOUNT \
TIMEOUT 45 \
assword: $PASSWORD
if [ "$?" = "0" ]; then
exit 0
fi
fi
###################################################################
#
# The script has failed. Terminate the connection mode.
#
chat -v TIMEOUT 3 "" AT 'OK-+++\c-OK' 'AT&C1&D2S0=0H0' OK
exit 1
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