Add this line to your /etc/syslog.conf file:
daemon.debug /var/log/messages
Then find the process ID of the syslog process, and kill -HUP <id>
Edit the file /etc/sysconfig/network-scripts/ifup-ppp, and change line 57
to read:
connect "/usr/sbin/chat -v -f /etc/sysconfig/network-scripts/chat-$DEVICE"
(viz., add the -v option)
You can read about this with "man pppd", and "man chat".