usb modem dialin 
Server

needed packages: mgetty, pppd

start and stop mgetty on plugin of usbmodem (0572:1329 Conexant Systems (Rockwell), Inc.)

/etc/init/mgetty.conf
# mgetty - dialin daemon

description "mgetty daemon"

start on tty-device-added KERNEL=ttyACM0
stop on tty-device-removed KERNEL=ttyACM0

respawn
exec /sbin/mgetty -s 115200 -D /dev/ttyACM0

/etc/mgetty/login.config
/AutoPPP/ - a_ppp /usr/sbin/pppd auth +chap -pap name dialinserver remotename dialer debug

I use chap instead of pap because of plain password used by pap.

/etc/ppp/chap-secrets
dialer dialinserver password *

/etc/ppp/options.ttyACM0
10.0.0.1:10.0.0.2


Client

needed packages: pppd

/etc/ppp/peers/dialinserver
noauth
connect "/usr/sbin/chat -v -f /etc/chatscripts/dialinserver"
debug
/dev/ttyS0
115200
defaultroute
noipdefault
name dialer
remotename dialinserver

/etc/chatscripts/dialinserver
ABORT BUSY ABORT 'NO CARRIER' ABORT VOICE ABORT 'NO DIALTONE' ABORT 'NO DIAL TONE'
ABORT 'NO ANSWER' ABORT DELAYED
'' ATZ
OK-AT-OK "ATDTnumber"
CONNECT \d\c

/etc/ppp/chap-secrets
dialer dialinserver password *

Connect with "pon dialinserver" and disconnect with "poff dialinserver"

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