thanku sir for responding me
below are the log messages (i am not disclosing the ip addresses)
Nov 12 01:33:16 localhost pppd[2760]: pppd 2.4.3 started by root, uid 0
Nov 12 01:33:16 localhost pppd[2760]: Using interface ppp0
Nov 12 01:33:16 localhost pppd[2760]: Connect: ppp0 <--> /dev/ttyACM0
Nov 12 01:33:36 localhost pppd[2760]: CHAP authentication succeeded: Authentication success
Nov 12 01:33:39 localhost pppd[2760]: local IP address "not disclosed"
Nov 12 01:33:39 localhost pppd[2760]: remote IP address "not disclosed"
Nov 12 01:33:39 localhost pppd[2760]: primary DNS address "not disclosed"
Nov 12 01:33:39 localhost pppd[2760]: secondary DNS address "not disclosed"
Nov 12 01:34:28 localhost pppd[2760]: Terminating on signal 15
Nov 12 01:34:28 localhost pppd[2760]: Connect time 0.9 minutes.
Nov 12 01:34:28 localhost pppd[2760]: Sent 80 bytes, received 96 bytes.