Hi Chris I don't know why but replacing the router (a 5 year old Draytek Vigor 2600) with a linux machine + pppoe modem fixed the problem. No change was needed with the phones and they are still behind NAT (but this time its managed by iptables). Buggy router I guess.... On 24/11/2011 15:27, Charlie Orford wrote:

Hmm it doesn't look like it is a fragmentation problem. Same "400 Bad Request" response even with the INVITE at 995 bytes:

http://pastebin.freeswitch.org/17868 http://pastebin.freeswitch.org/17867

FYI, issuing "ping -f -l 1470 my.fs.server.com" from a windows workstation on the same network as the phone goes through ok (so I think this means as long as the INVITE packet is 1470 bytes or less, it should not get fragmented).

Is there anything else I can debug to track this down?

Charlie

On 24/11/2011 14:59, chrisbware@interfree.it wrote:

...

Your INVITE is 1672 bytes. Some router split packet over 1500 bytes. To test if this is the problema, disable all codecs leaving only "basic codecs" as Aastra call them (g711a,g711u,g729) and disable ice. Packet should be smaller: if the problem is fixed in this way, packet fragmentation is the cause.

-----Messaggio originale----- Da: Charlie Orford<charlie.orford@attackplan.net> Inviato il: 24 Nov 2011 - 13:47 A: FreeSWITCH Users Help<freeswitch-users@lists.freeswitch.org>

Hi Chris,

I've increased the debugging and taken a new trace:

http://pastebin.freeswitch.org/17864

And here is the output of tport_sip.log:

http://pastebin.freeswitch.org/17865

A person on the #freeswitch IRC channel suggested the problem might be due to packet fragmentation?

Charlie

On 24/11/2011 14:29, chrisbware@interfree.it wrote:

...

I suspect problem is on SDP but we can't see it on pastebin. -----Messaggio originale----- Da: Charlie Orford Inviato il: 24 Nov 2011 - 10:17 A: FreeSWITCH Users Help

Hi list

I have done some googling but cannot find much info about what causes FS to send a SIP/2.0 400 Bad Request response.

My phones are able to register but when I try a test call (e.g. to 9196) FS responds to the INVITE with Bad Request. For a short transcript of this in action see: http://pastebin.freeswitch.org/17863

My setup: I have a clean git head install (cloned yesterday) and am running the unmodified "out of the box" configuration (except I have enabled NDLB-force-rport on the internal profile and set a default poassword). FS is on a public server (no nat) and phones (aastra 57i models) are all natted behind an ADSL router.

Thanks& Regards, Charlie

_________________________________________________________________________ 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

------------------------------------------------------------------------------- Valore legale alle tue mail InterfreePEC - la tua Posta Elettronica Certificata http://pec.interfree.it -------------------------------------------------------------------------------

Most SIP routers with in-built ALGs that old are probably poor implementations. It may well have messed about with the SDP offer but not changed the content length in the SIP header. I use Draytek's and frequently find I have to change the local SIP port to anything other than 5060 to stop it messing about with the signaling. FreeSWITCH does a much better job at NAT traversal from the far end than most modems can achieve at the near end. -- View this message in context: http://freeswitch-users.2379917.n2.nabble.com/Reasons-for-a-SIP-2-0-400-Bad-... Sent from the freeswitch-users mailing list archive at Nabble.com.