This is somewhat speculative, by I think we have evidence that the final OK is received. In the past with NAT issues where the responses are not being received by the client, the CSeq does not get incremented and I get reoccurring "CSeq: 1 REGISTER" packets. Here we see CSeq 1,2,3 (all pefect) and then a CSeq 4 recv starting over that has errors. Since the CSeq increased, I have a firm hypothesis that the Cseq 3 response was received. But I agree a sip trace on the client end would be definitive. From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Michael Collins Sent: Friday, April 26, 2013 2:12 PM To: FreeSWITCH Users Help Subject: Re: [Freeswitch-users] ERROR 404 BAD HEADER I think we've established that the device is misbehaving. The only thing I have to wonder about is if the device receives the final 200 OK in the original REG dialog. If it doesn't then I could imagine it "trying harder" by sending registrations to other IP/port combos. (I don't condone that behavior, just that I understand why a device might do that.) Can you get a SIP trace from the device that is attempting to register? It would be extremely helpful for you to see what that device is seeing. -MC On Fri, Apr 26, 2013 at 10:41 AM, pratham2013 <manish.khilwani@gmail.com> wrote: Hello Sean, If it is issue with router then it also should not work for the voip.ms account. I can register extension voip.ms but not with my server. Is there anything else do you know which adding port twice in contact header? Thanks Manish Khilwani -- View this message in context: http://freeswitch-users.2379917.n2.nabble.com/ERROR-404-BAD-HEADER-tp7590040 p7590182.html Sent from the freeswitch-users mailing list archive at Nabble.com. _________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com FreeSWITCH-powered IP PBX: The CudaTel Communication Server http://www.cudatel.com Official FreeSWITCH Sites http://www.freeswitch.org http://wiki.freeswitch.org http://www.cluecon.com FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org -- Michael S Collins Twitter: @mercutioviz http://www.FreeSWITCH.org http://www.ClueCon.com http://www.OSTAG.org