The Abbot project

/etc/mgetty+sendfax/mgetty.config:

debug 4
fax-id 7 095 939xxxx
speed 38400

port ttyS1
  data-only y
  speed 38400

/etc/mgetty+sendfax/login.config:

/AutoPPP/ -     a_ppp   /usr/sbin/pppd

/etc/inittab:

S1:2345:respawn:/sbin/mgetty ttyS1

# telinit q

/etc/ppp/options.ttyS1:

auth
crtscts
192.168.1.1:192.168.1.2
linkname thepmodem
ms-dns 213.131.0.1
refuse-chap
refuse-mschap
refuse-mschap-v2
refuse-eap
require-pap
logfile /var/log/ppp/ttyS1.log
debug

/etc/ppp/pap-secrets:

# client        server  secret                  IP addresses
ivanov          *       bebebe                  192.168.1.2

# iptables -t nat -A POSTROUTING -o eth0 -s 192.168.1.2 -j MASQUERADE
# /etc/init.d/iptables save
# sysctl -w net.ipv4.ip_forward=1

/etc/sysctl.conf:

net.ipv4.ip_forward = 1

# crontab -e
0 21 * * * rm -f /etc/nologin.ttyS1
0 10 * * * touch /etc/nologin.ttyS1