Questo il /var/log/messages con "pon Libero"
May 27 12:51:05 localhost pppd[4607]: pppd 2.4.4 started by root, uid 0
May 27 12:51:06 localhost chat[4610]: abort on (BUSY)
May 27 12:51:06 localhost chat[4610]: abort on (NO CARRIER)
May 27 12:51:06 localhost chat[4610]: abort on (VOICE)
May 27 12:51:06 localhost chat[4610]: abort on (NO DIALTONE)
May 27 12:51:06 localhost chat[4610]: abort on (NO DIAL TONE)
May 27 12:51:06 localhost chat[4610]: abort on (NO ANSWER)
May 27 12:51:06 localhost chat[4610]: abort on (DELAYED)
May 27 12:51:06 localhost chat[4610]: send (ATZ^M)
May 27 12:51:06 localhost chat[4610]: expect (OK)
May 27 12:51:06 localhost chat[4610]: ^M^M^MATZ^M^M
May 27 12:51:06 localhost chat[4610]: OK
May 27 12:51:06 localhost chat[4610]: -- got it
May 27 12:51:06 localhost chat[4610]: send (ATDT7027020000^M)
May 27 12:51:06 localhost chat[4610]: expect (CONNECT)
May 27 12:51:06 localhost chat[4610]: ^M
May 27 12:51:06 localhost chat[4610]: ATDT7027020000^M^M
May 27 12:51:09 localhost chat[4610]: NO DIALTONE
May 27 12:51:09 localhost chat[4610]: -- failed
May 27 12:51:09 localhost chat[4610]: Failed (NO DIALTONE)
May 27 12:51:10 localhost pppd[4607]: Exit.