problem with dialup connection

Hi All,

I am facing a problem to connect to the internet with SME 6.0.1. some time it's connecting without any prolem and this the log:

Jul 12 17:11:33 gateway pppd[4195]: pppd 2.4.2b1 started by root, uid 0
Jul 12 17:11:33 gateway pppd[4195]: using channel 12
Jul 12 17:11:33 gateway kernel: divert: not allocating divert_blk for non-ethernet device ppp0
Jul 12 17:11:33 gateway pppd[4195]: Using interface ppp0
Jul 12 17:11:33 gateway pppd[4195]: Connect: ppp0 <--> /dev/ttyS0
Jul 12 17:11:33 gateway pppd[4195]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x2eae6859> <pcomp> <accomp>]
Jul 12 17:11:33 gateway /etc/hotplug/net.agent: assuming ppp0 is already up
Jul 12 17:11:34 gateway pppd[4195]: rcvd [LCP ConfReq id=0x0]
Jul 12 17:11:34 gateway pppd[4195]: sent [LCP ConfAck id=0x0]
Jul 12 17:11:34 gateway pppd[4195]: rcvd [LCP TermAck id=0x0]
Jul 12 17:11:36 gateway pppd[4195]: rcvd [LCP ConfReq id=0x1 <asyncmap 0xa0000> <auth pap> <magic 0xa7227c71> <pcomp> <accomp>]
Jul 12 17:11:36 gateway pppd[4195]: sent [LCP ConfAck id=0x1 <asyncmap 0xa0000> <auth pap> <magic 0xa7227c71> <pcomp> <accomp>]
Jul 12 17:11:36 gateway pppd[4195]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x2eae6859> <pcomp> <accomp>]
Jul 12 17:11:36 gateway pppd[4195]: rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x2eae6859> <pcomp> <accomp>]
Jul 12 17:11:36 gateway pppd[4195]: sent [LCP EchoReq id=0x0 magic=0x2eae6859]
Jul 12 17:11:36 gateway pppd[4195]: sent [PAP AuthReq id=0x1 user="abcd" password=<hidden>]
Jul 12 17:11:37 gateway pppd[4195]: rcvd [LCP EchoRep id=0x0 magic=0xa7227c71]
Jul 12 17:11:40 gateway pppd[4195]: rcvd [PAP AuthAck id=0x1 ""]
Jul 12 17:11:40 gateway pppd[4195]: PAP authentication succeeded
Jul 12 17:11:40 gateway pppd[4195]: sent [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
Jul 12 17:11:40 gateway pppd[4195]: sent [IPCP ConfReq id=0x1 <compress VJ 0f 01> <addr 0.0.0.0>]
Jul 12 17:11:40 gateway pppd[4195]: rcvd [IPCP ConfReq id=0x1 <addr 212.118.133.46>]
Jul 12 17:11:40 gateway pppd[4195]: sent [IPCP ConfAck id=0x1 <addr 212.118.133.46>]
Jul 12 17:11:40 gateway pppd[4195]: rcvd [LCP ProtRej id=0x2 80 fd 01 01 00 0f 1a 04 78 00 18 04 78 00 15 03 2f]
Jul 12 17:11:41 gateway pppd[4195]: rcvd [LCP EchoReq id=0x1 magic=0xa7227c71 78 00 18 04]
Jul 12 17:11:41 gateway pppd[4195]: sent [LCP EchoRep id=0x1 magic=0x2eae6859 00 00 00 00]
Jul 12 17:11:42 gateway pppd[4195]: rcvd [IPCP ConfReq id=0x2 <addr 212.118.133.46>]
Jul 12 17:11:42 gateway pppd[4195]: sent [IPCP ConfAck id=0x2 <addr 212.118.133.46>]
Jul 12 17:11:43 gateway pppd[4195]: sent [IPCP ConfReq id=0x1 <compress VJ 0f 01> <addr 0.0.0.0>]
Jul 12 17:11:43 gateway pppd[4195]: rcvd [IPCP ConfRej id=0x1 <compress VJ 0f 01>]
Jul 12 17:11:43 gateway pppd[4195]: sent [IPCP ConfReq id=0x2 <addr 0.0.0.0>]
Jul 12 17:11:43 gateway pppd[4195]: rcvd [IPCP ConfNak id=0x2 <addr xx.xx.xx.xx>]
Jul 12 17:11:43 gateway pppd[4195]: sent [IPCP ConfReq id=0x3 <addr xx.xx.xx.xx>]
Jul 12 17:11:43 gateway pppd[4195]: rcvd [IPCP ConfAck id=0x3 <addr xx.xx.xx.xx>]
Jul 12 17:11:43 gateway pppd[4195]: local IP address xx.xx.xx.xx
Jul 12 17:11:43 gateway pppd[4195]: remote IP address yy.yy.yy.yy
Jul 12 17:11:43 gateway pppd[4195]: Script /etc/ppp/ip-up started (pid 4204)

and some times I can't connect and this the log

Jul 12 17:22:27 gateway pppd[4925]: pppd 2.4.2b1 started by root, uid 0
Jul 12 17:22:27 gateway pppd[4925]: using channel 18
Jul 12 17:22:27 gateway kernel: divert: not allocating divert_blk for non-ethernet device ppp0
Jul 12 17:22:27 gateway pppd[4925]: Using interface ppp0
Jul 12 17:22:27 gateway pppd[4925]: Connect: ppp0 <--> /dev/ttyS0
Jul 12 17:22:27 gateway pppd[4925]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x6f52e44> <pcomp> <accomp>]
Jul 12 17:22:27 gateway /etc/hotplug/net.agent: assuming ppp0 is already up
Jul 12 17:22:30 gateway pppd[4925]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x6f52e44> <pcomp> <accomp>]
Jul 12 17:22:30 gateway pppd[4925]: rcvd [LCP ConfReq id=0x1 <mru 1500> <asyncmap 0xa0000> <auth pap> <magic 0x11bef6d> <pcomp> <accomp>]
Jul 12 17:22:30 gateway pppd[4925]: sent [LCP ConfAck id=0x1 <mru 1500> <asyncmap 0xa0000> <auth pap> <magic 0x11bef6d> <pcomp> <accomp>]
Jul 12 17:22:30 gateway pppd[4925]: rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x6f52e44> <pcomp> <accomp>]
Jul 12 17:22:30 gateway pppd[4925]: sent [LCP EchoReq id=0x0 magic=0x6f52e44]
Jul 12 17:22:30 gateway pppd[4925]: sent [PAP AuthReq id=0x1 user="alraiky" password=<hidden>]
Jul 12 17:22:30 gateway pppd[4925]: rcvd [LCP ConfReq id=0x2 <mru 1500> <asyncmap 0xa0000> <auth pap> <magic 0x11bef6d> <pcomp> <accomp>]
Jul 12 17:22:30 gateway pppd[4925]: sent [LCP ConfReq id=0x2 <asyncmap 0x0> <magic 0x249be71c> <pcomp> <accomp>]
Jul 12 17:22:30 gateway pppd[4925]: sent [LCP ConfAck id=0x2 <mru 1500> <asyncmap 0xa0000> <auth pap> <magic 0x11bef6d> <pcomp> <accomp>]
Jul 12 17:22:30 gateway pppd[4925]: rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x6f52e44> <pcomp> <accomp>]
Jul 12 17:22:30 gateway pppd[4925]: rcvd [LCP ConfAck id=0x2 <asyncmap 0x0> <magic 0x249be71c> <pcomp> <accomp>]
Jul 12 17:22:30 gateway pppd[4925]: sent [LCP EchoReq id=0x0 magic=0x249be71c]
Jul 12 17:22:30 gateway pppd[4925]: sent [PAP AuthReq id=0x2 user="alraiky" password=<hidden>]
Jul 12 17:22:30 gateway pppd[4925]: rcvd [LCP EchoRep id=0x0 magic=0x11bef6d]
Jul 12 17:22:30 gateway pppd[4925]: rcvd [LCP ConfReq id=0xa1 <magic 0x7d36ea5b> <mru 1500> <auth pap> <pcomp> <accomp>]
Jul 12 17:22:30 gateway pppd[4925]: sent [LCP ConfReq id=0x3 <asyncmap 0x0> <magic 0xf534e71d> <pcomp> <accomp>]
Jul 12 17:22:30 gateway pppd[4925]: sent [LCP ConfAck id=0xa1 <magic 0x7d36ea5b> <mru 1500> <auth pap> <pcomp> <accomp>]
Jul 12 17:22:30 gateway pppd[4925]: rcvd [LCP ConfRej id=0x3 <asyncmap 0x0>]
Jul 12 17:22:30 gateway pppd[4925]: sent [LCP ConfReq id=0x4 <magic 0xf534e71d> <pcomp> <accomp>]
Jul 12 17:22:30 gateway pppd[4925]: rcvd [LCP ConfAck id=0x4 <magic 0xf534e71d> <pcomp> <accomp>]
Jul 12 17:22:30 gateway pppd[4925]: sent [LCP EchoReq id=0x0 magic=0xf534e71d]
Jul 12 17:22:30 gateway pppd[4925]: sent [PAP AuthReq id=0x3 user="abcd" password=<hidden>]
Jul 12 17:22:40 gateway pppd[4925]: sent [PAP AuthReq id=0x4 user="abcd" password=<hidden>]
Jul 12 17:22:50 gateway pppd[4925]: sent [PAP AuthReq id=0x5 user="abcd" password=<hidden>]
Jul 12 17:23:00 gateway pppd[4925]: sent [LCP EchoReq id=0x1 magic=0xf534e71d]
Jul 12 17:23:00 gateway pppd[4925]: sent [PAP AuthReq id=0x6 user="abcd" password=<hidden>]
Jul 12 17:23:10 gateway pppd[4925]: sent [PAP AuthReq id=0x7 user="abcd" password=<hidden>]
Jul 12 17:23:20 gateway pppd[4925]: sent [PAP AuthReq id=0x8 user="abcd" password=<hidden>]

is there any way to slove this issue.