Hi Konstantin,

Thanks for your kind reply. You can check the iptables output at : 
http://pastebin.com/i3zUfVeb.
I hope that this will give you enough clue in right direction.

With Regards,

Vijay Thakur


======================================================================================================================

Message: 3
Date: Fri, 3 Aug 2012 17:38:23 +0300
From: "Konstantin M."<evilz...@gmail.com>
Subject: Re: [SR-Users] kernel: nf_ct_sip: dropping packetIN= OUT=eth0
        Error
To: "SIP Router - Kamailio (OpenSER) and SIP Express Router (SER) -
        Users   Mailing List"<sr-users@lists.sip-router.org>
Message-ID:
        <caeyttzdey88x-gc+wdwlou+smsb60h+m36h7xwcu448v0yt...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

Looks like your firewall is passing a state RELATED,ESTABLISHED and don't
have a permit rule for a state NEW.
Check your iptables or simply do a command: iptables-save >
/tmp/iptables.txt    and paste this file (/tmp/iptables.txt) to pastebin

2012/8/3 Vijay Thakur<vijay.tha...@loopmethods.com>

Hello 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 server is hosted on Linnode.

Kindly guide me to solve the problem

--
Best Regards,

Vijay Thakur
(Assistant Manager - Networks)
Mobile   : +91 8744018065
Mail     :vijay.tha...@loopmethods.com

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