Thanks for the hint. What is the file name in /etc/modprob.d/ where i am supposed to enter this module name to disable it.

Thanks 

Vijay Tha

Message: 1
Date: Mon, 06 Aug 2012 09:01:03 -0400
From: Richard Fuchs <rfuchs@sipwise.com>
Subject: Re: [SR-Users] Kernel Droping SIP packet
To: sr-users@lists.sip-router.org
Message-ID: <501FC00F.6000604@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

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