Here's a suggested change to ppp, to provide better support for chat
scripts.  The main idea is to allow tokens like USER, PASSWD, SERVER and
to let factotum hand over the real values, so you can dial completely
non-interactively.

The server flag does double duty: it lets you store multiple ppp
credentials inside factotum and also uses the name of the server as the
phone number to dial.  Absent the -s flag, it tries to deduce from the
name of the chat file or from the telco string.

Examples,
ppp -b 115200 -f -P -u -M telco.chat -p telco!5552222
ppp -b 115200 -f -P -u -M modem.chat -p /dev/eia1 -s 5552222
ppp -b 115200 -f -P -u -M 5552222.chat -p /dev/eia1

This is lightly tested, so let me know if anything goes wrong.