[SR-Users] sip response not handled by kamailio

[Marko Seidenglanz]

Hello,

The problem of kamailio not receiving the packet's is that packet size of
200 response seems to be too large. I removed the SDP from response and it
arrives.

Anyone had a similar problem and knows how it might get solved (accept
switching to TCP)

Kind regards,
Marko

2014-10-24 10:51 GMT+02:00 Marko Seidenglanz <marko.seidenglanz at gmail.com>:

> Hello,
>
> We are trying to use Kamailio 4.2 with RTPEngine 3.3 behind NAT.
>
> Somehow SIP responses (200 OK) are not handled by Kamailio.
>
>
>
> The following INVITE is send to the receiving end (WebRTC Client):
>
> INVITE sip:evQzk4l62MdF3G7U6eudj at whtest3.24dial.com SIP/2.0
> Record-Route: <sip:104.155.11.255:5060;nat=yes;lr=on>
> Via: SIP/2.0/UDP 104.155.11.255:5060
> ;branch=z9hG4bK865.9db0c023bec2f314e89ae0f18b78d2f0.0
> Via: SIP/2.0/UDP 10.240.215.73:5060
> ;rport=5060;received=146.148.113.245;branch=z9hG4bK644600e2
> Max-Forwards: 69
> From: "Anonymous" <sip:anonymous at anonymous.invalid>;tag=as68f0a26a
> To: <sip:evQzk4l62MdF3G7U6eudj at whtest3.24dial.com>
> Contact: <sip:anonymous at 10.240.215.73:5060;alias=146.148.113.245~5060~1>
> Call-ID: 368f6ec901a3552e3b37a70907634f4f at 10.240.215.73:5060
> CSeq: 102 INVITE
> User-Agent: Asterisk PBX 12.5.0
> Date: Fri, 24 Oct 2014 08:38:09 GMT
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO,
> PUBLISH, MESSAGE
> Supported: replaces, timer
> Content-Type: application/sdp
> Content-Length: 738
> P-hint: outbound
> .......
>
>
> The client response looks like this:
>
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 104.155.11.255:5060
> ;branch=z9hG4bK865.9db0c023bec2f314e89ae0f18b78d2f0.0;rport=5060;received=104.155.11.255
>  , SIP/2.0/UDP 10.240.215.73:5060
> ;rport=5060;received=146.148.113.245;branch=z9hG4bK644600e2
> From: "Anonymous" <sip:anonymous at anonymous.invalid>;tag=as68f0a26a
> To:  <sip:evQzk4l62MdF3G7U6eudj at whtest3.24dial.com
> >;tag=E2VMB39U5NYHCXLZREFGQV2DAXPCZXNQ6J6P
> Contact:  <sip:evQzk4l62MdF3G7U6eudj at whtest3.24dial.com
> >;tag=E2VMB39U5NYHCXLZREFGQV2DAXPCZXNQ6J6P
> Call-ID: 368f6ec901a3552e3b37a70907634f4f at 10.240.215.73:5060
> CSeq: 102 INVITE
> Record-Route: <sip:104.155.11.255:5060;nat=yes;lr=on>
> Content-Type: application/sdp
> Content-Length: 938
> .......
>
>
>
> I have a xlog call as the first statement in kamailio routing script. I
> can see the request, which get's handled correctly but the response does
> not appear in kamailio log, though it arrives at the machine.
>
> I am totally helpless, what might be wrong. If we use kamailio on a public
> accessable machine everything works as expected.
>
>
> Maybe anyone might have had similiar problems using kamailio behind NAT.
>
>
> Kind regards,
> Marko
>
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