It woked once... but NM don't set correct nameservers.

log of the succesful connection:
Oct  9 19:43:55 simone-desktop pppd[1887]: Plugin /usr/lib/pppd/2.4.4/nm-pppd-plugin.so loaded.                                                                 
Oct  9 19:43:55 simone-desktop pppd[1887]: pppd 2.4.5 started by root, uid 0    
Oct  9 19:43:55 simone-desktop pppd[1887]: Using interface ppp0                 
Oct  9 19:43:55 simone-desktop pppd[1887]: Connect: ppp0 <--> /dev/ttyUSB0      
Oct  9 19:43:55 simone-desktop pppd[1887]: CHAP authentication succeeded        
Oct  9 19:43:55 simone-desktop pppd[1887]: CHAP authentication succeeded        
Oct  9 19:44:03 simone-desktop pppd[1887]: Could not determine remote IP address: defaulting to 10.64.64.64                                                     
Oct  9 19:44:03 simone-desktop pppd[1887]: local  IP address 217.201.158.125    
Oct  9 19:44:03 simone-desktop pppd[1887]: remote IP address 10.64.64.64        
Oct  9 19:45:12 simone-desktop pppd[1887]: Terminating on signal 15             
Oct  9 19:45:12 simone-desktop pppd[1887]: Connect time 1.2 minutes.            
Oct  9 19:45:12 simone-desktop pppd[1887]: Sent 80 bytes, received 96 bytes.    
Oct  9 19:45:12 simone-desktop pppd[1887]: Connection terminated.               
Oct  9 19:45:13 simone-desktop pppd[1887]: Exit. 

/etc/resolv.conf:
# Generated by NetworkManager


When I connect with "pon" script i get:

Oct  9 19:48:55 simone-desktop pppd[2155]: pppd 2.4.5 started by root, uid 0    
Oct  9 19:48:56 simone-desktop chat[2157]: timeout set to 60 seconds            
Oct  9 19:48:56 simone-desktop chat[2157]: abort on (ERROR)                     
Oct  9 19:48:56 simone-desktop chat[2157]: abort on (BUSY)                      
Oct  9 19:48:56 simone-desktop chat[2157]: abort on (VOICE)                     
Oct  9 19:48:56 simone-desktop chat[2157]: abort on (NO CARRIER)                
Oct  9 19:48:56 simone-desktop chat[2157]: abort on (NO DIALTONE)               
Oct  9 19:48:56 simone-desktop chat[2157]: abort on (NO DIAL TONE)              
Oct  9 19:48:56 simone-desktop chat[2157]: abort on (NO ANSWER)                 
Oct  9 19:48:56 simone-desktop chat[2157]: send (ATZ^M)                         
Oct  9 19:48:56 simone-desktop chat[2157]: send (AT&FH0M0^M)                    
Oct  9 19:48:57 simone-desktop chat[2157]: expect (OK)                          
Oct  9 19:48:57 simone-desktop chat[2157]: ATZ^M^M                              
Oct  9 19:48:57 simone-desktop chat[2157]: OK
Oct  9 19:48:57 simone-desktop chat[2157]:  -- got it
Oct  9 19:48:57 simone-desktop chat[2157]: send (ATDT*99*#^M)
Oct  9 19:48:57 simone-desktop chat[2157]: timeout set to 75 seconds
Oct  9 19:48:57 simone-desktop chat[2157]: expect (CONNECT)
Oct  9 19:48:57 simone-desktop chat[2157]: ^M
Oct  9 19:48:57 simone-desktop chat[2157]: AT&FH0M0^M^M
Oct  9 19:48:57 simone-desktop chat[2157]: OK^M
Oct  9 19:48:57 simone-desktop chat[2157]: ATDT*99*#^M^M
Oct  9 19:48:57 simone-desktop chat[2157]: CONNECT
Oct  9 19:48:57 simone-desktop chat[2157]:  -- got it
Oct  9 19:48:57 simone-desktop pppd[2155]: Serial connection established.
Oct  9 19:48:57 simone-desktop pppd[2155]: Using interface ppp0
Oct  9 19:48:57 simone-desktop pppd[2155]: Connect: ppp0 <--> /dev/ttyUSB0
Oct  9 19:48:58 simone-desktop pppd[2155]: PAP authentication succeeded
Oct  9 19:49:02 simone-desktop pppd[2155]: Could not determine remote IP address: defaulting to 10.64.64.64
Oct  9 19:49:02 simone-desktop pppd[2155]: local  IP address 217.202.114.230
Oct  9 19:49:02 simone-desktop pppd[2155]: remote IP address 10.64.64.64
Oct  9 19:49:02 simone-desktop pppd[2155]: primary   DNS address 213.230.129.10
Oct  9 19:49:02 simone-desktop pppd[2155]: secondary DNS address 213.230.155.10