Thanks all of your for reply. Here is the output of command: root@li496-23:~# lsmod | grep -i sip root@li496-23:~# This command is giving blank output. This is linnode server. So the zcat /proc/config.gz command reveals the kernel loaded modules. You can see complete output at pastebin: http://pastebin.com/a0iqpc4D. Thanks in advance Vijay Th. On Monday 06 August 2012 08:26 PM, sr-users-request(a)lists.sip-router.org wrote: > Send sr-users mailing list submissions to > sr-users(a)lists.sip-router.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users > or, via email, send a message with subject or body 'help' to > sr-users-request(a)lists.sip-router.org > > You can reach the person managing the list at > sr-users-owner(a)lists.sip-router.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of sr-users digest..." > > > Today's Topics: > > 1. Re: Kernel Droping SIP packet (Richard Fuchs) > 2. Re: Kernel Droping SIP packet (Alex Balashov) > 3. Re: Kernel Droping SIP packet (Konstantin M.) > 4. Re: Kernel Droping SIP packet (Alex Balashov) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 06 Aug 2012 09:01:03 -0400 > From: Richard Fuchs <rfuchs(a)sipwise.com> > Subject: Re: [SR-Users] Kernel Droping SIP packet > To: sr-users(a)lists.sip-router.org > Message-ID: <501FC00F.6000604(a)sipwise.com> > Content-Type: text/plain; charset="iso-8859-1" > > On 08/06/12 06:08, Vijay Thakur wrote: >> Hi all, >> >> I have configure Kamailio 3.1.5 Server. All things are working fine. >> When i make a call from Soft phone (X-Lite) to iphone, all is working >> fine. But in other case call from iphone to Softphone is not working, >> even not ringing. During checking the logs i am getting the error: >> >> Aug 3 04:36:09 localhost kernel: nf_ct_sip: dropping packetIN=eth0 OUT= >> MAC=f2:3c:91:ae:92:36:c8:4c:75:f5:c4:ff:08:00 SRC=122.xxx.xxx.77 >> DST=xx.116.xx.23 LEN=1482 TOS=0x00 PREC=0x00 TTL=51 ID=50183 DF >> PROTO=TCP SPT=15587 DPT=5060 SEQ=3285635734 ACK=3113844065 WINDOW=5763 >> RES=0x00 ACK URGP=0 OPT (0101080A000E20610932B25A) > This is coming from nf_conntrack_sip, which is a netfilter connection > tracking kernel module for SIP. I've never used it, but judging from > what Google brings up, it seems to be very buggy. You should be able to > just unload it by issuing "rmmod nf_conntrack_sip". If that doesn't work > and/or if you want to keep it from auto-loading, you can blacklist it in > /etc/modprobe.d/ and then reboot. > > HTH > >