pppd(8) options

example pppd(8) configuration file:

 /dev/tty03
 115200
 # 0.0.0.0:10.64.64.64
 # the peer has to give us the IP
 noipdefault
 defaultroute
 crtscts
 deflate 0
 bsdcomp 0
 noccp
 noaccomp
 novj
 novjccomp
 lock
 noauth
 # debug
 # kdebug 4
 user eplus
 remotename foo
 connect '/usr/sbin/chat -f /etc/ppp/peers/umts.chat'

the man page for pppd(8) explains all options very well