Problemi con connessione

ho un problemino con potato. Non riesco a farlo andare in internet. Ho creato gli script e i file di conf. che mi sono stati suggeriti dal mio provider (tiscalinet) ma dopo aver composto il numero, aver fatto un po' di casino, ho un attimo di silinzio e dopo pochi secondi sento che il modem si chiude. Per farvi capire meglio il mio problema, vi riporto qui sotto una porzione del file messages a riguardo:

Feb 14 18:57:18 quimera pppd[594]: pppd 2.3.11 started by root, uid 0
Feb 14 18:57:19 quimera chat[595]: send (atz^M)
Feb 14 18:57:19 quimera chat[595]: expect (OK)
Feb 14 18:57:20 quimera chat[595]: atz^M^M
Feb 14 18:57:20 quimera chat[595]: OK
Feb 14 18:57:20 quimera chat[595]: -- got it
Feb 14 18:57:20 quimera chat[595]: send (atx3w2l1^M)
Feb 14 18:57:20 quimera chat[595]: expect (OK)
Feb 14 18:57:20 quimera chat[595]: ^M
Feb 14 18:57:20 quimera chat[595]: atx3w2l1^M^M
Feb 14 18:57:20 quimera chat[595]: OK
Feb 14 18:57:20 quimera chat[595]: -- got it
Feb 14 18:57:20 quimera chat[595]: send (atdt0183820000^M)
Feb 14 18:57:21 quimera chat[595]: expect (CONNECT)
Feb 14 18:57:21 quimera chat[595]: ^M
Feb 14 18:57:42 quimera chat[595]: atdt0183820000^M^M
Feb 14 18:57:42 quimera chat[595]: CONNECT
Feb 14 18:57:42 quimera chat[595]: -- got it
Feb 14 18:57:42 quimera chat[595]: send (^M)
Feb 14 18:57:42 quimera pppd[594]: Serial connection established.
Feb 14 18:57:42 quimera kernel: ppp_ioctl: set dbg flags to 10000
Feb 14 18:57:42 quimera kernel: ppp_ioctl: set flags to 10000
Feb 14 18:57:42 quimera pppd[594]: Using interface ppp0
Feb 14 18:57:42 quimera kernel: ppp_tty_ioctl: set xasyncmap
Feb 14 18:57:42 quimera kernel: ppp_tty_ioctl: set xmit asyncmap ffffffff
Feb 14 18:57:42 quimera kernel: ppp_ioctl: set flags to 10000
Feb 14 18:57:42 quimera kernel: ppp_ioctl: set mru to 5dc
Feb 14 18:57:42 quimera kernel: ppp_tty_ioctl: set rcv asyncmap ffffffff
Feb 14 18:57:42 quimera pppd[594]: Connect: ppp0 <--> /dev/modem
Feb 14 18:58:13 quimera kernel: ppp: channel ppp0 closing.
Feb 14 18:58:13 quimera pppd[594]: LCP: timeout sending Config-Requests
Feb 14 18:58:13 quimera pppd[594]: Connection terminated.
Feb 14 18:58:13 quimera pppd[594]: Receive serial link is not 8-bit clean:
Feb 14 18:58:13 quimera pppd[594]: Problem: all had bit 7 set to 0
Feb 14 18:58:13 quimera pppd[594]: Hangup (SIGHUP)
Feb 14 18:58:13 quimera pppd[594]: Exit.