Uhm...

let me guess: you didn't tell pppd to not require the peer to authenticate
itself, and it doesn't... If I recall right, some time ago the default was
changed from "noauth" to "auth". So for an end-user connection, you want
to add "noauth" to the options.

If this doesn't help you, add "debug" to the options, add an entry
for "daemon.debug" to your syslog.conf, restart syslogd, tell ppp to
dial out and watch the debug output.

Regards,
	-is