[OpenSIPS-Users] NAT and ACK (private IP/domain)

Thu Apr 23 21:14:51 CEST 2009

I understand a concept I was missing, once record_route() is called I have to do a 

if(loose_route()){
  route(x);
}

I was trying to route it again using is_uri_host_local() and lookup("location") but  is_uri_host_local()  was failing because the domain name was replaced by an IP address.

I will continue to read and practice to understand concepts I am still missunderstanding.

thank you for your help

________________________________

From: users-bounces at lists.opensips.org on behalf of Julien Chavanton
Sent: Thu 23/04/2009 6:48 PM
To: Bogdan-Andrei Iancu
Cc: users at lists.opensips.org
Subject: Re: [OpenSIPS-Users] NAT and ACK (private IP/domain)

Right, in the "200 OK" request the Contact as the private IP address.

I register with a domain name so I guess the same domain name as to be set in Contact so I was expecting :
- > Contact: <sip:778 at 10.0.1.71:33802;rinstance=8572c408a8cc28e3>.
should be replaced by :
- > Contact: <sip:778 at osip.dev.com:33802;rinstance=8572c408a8cc28e3>.

I have fix_nated_contact(); both in ROUTE and in REPLY_ROUTE the make sure it is always executed, I understand it correctly
1.6.1. fix_nated_contact :  "Rewrites Contact HF to contain request's source address:port"  

In my case Opensips will need a domain name to find that the target is registered localy, how should I handle this, register with an IP ?

#
U 10.0.4.201:5060 -> 74.56.45.88:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 192.168.1.125:5060;received=74.56.45.88;rport=5060;branch=z9hG4bKPjSEGMUzJy5GjV8YCUETnWMdjV-gfyCn86.
Record-Route: <sip:10.0.4.201;lr;nat=yes>.
Contact: <sip:778 at 10.0.1.71:33802;rinstance=8572c408a8cc28e3>.
To: <sip:778 at osip.dev.com>;tag=f9353e15.
From: <sip:julien at osip.dev.com>;tag=mpq.p-Mu98E8HBomB7Kh5SvmPzJisbwq.
Call-ID: eaFGOPK1Ah4PL8s0dQd2aDotzsaJTuHg.
CSeq: 2972 INVITE.
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO.
Record-Route: <sip:10.0.4.201;lr=on;nat=yes>.
Via: SIP/2.0/UDP 10.0.4.201;branch=z9hG4bK0135.5e99e0d.2.
Via: SIP/2.0/UDP 192.168.1.125:5060;received=74.56.45.88;rport=5060;branch=z9hG4bKPj2eYMnj8kZr0p7CSrA5rIIXRPI.uVmAQp.
Max-Forwards: 69.
From: sip:julien at osip.dev.com;tag=mpq.p-Mu98E8HBomB7Kh5SvmPzJisbwq.
To: sip:778 at osip.dev.com;tag=f9353e15.
Call-ID: eaFGOPK1Ah4PL8s0dQd2aDotzsaJTuHg.
CSeq: 2972 ACK.
Content-Length:  0.
P-hint: Route[6]: mediaproxy .
.
#
U 10.0.1.71:33802 -> 10.0.4.201:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 10.0.4.201;branch=z9hG4bK0135.5e99e0d.0.
Via: SIP/2.0/UDP 192.168.1.125:5060;received=74.56.45.88;rport=5060;branch=z9hG4bKPjSEGMUzJy5GjV8YCUETnWMdjV-gfyCn86.
Record-Route: <sip:10.0.4.201;lr;nat=yes>.
Contact: <sip:778 at 10.0.1.71:33802;rinstance=8572c408a8cc28e3>.
To: <sip:778 at osip.dev.com>;tag=f9353e15.
From: <sip:julien at osip.dev.com>;tag=mpq.p-Mu98E8HBomB7Kh5SvmPzJisbwq.
Call-ID: eaFGOPK1Ah4PL8s0dQd2aDotzsaJTuHg.
CSeq: 2972 INVITE.
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO.
Content-Type: application/sdp.
User-Agent: X-Lite release 1100l stamp 47546.
Content-Length: 181.
.
v=0.
o=- 4 2 IN IP4 10.0.1.71.
s=CounterPath X-Lite 3.0.
c=IN IP4 10.0.1.71.
t=0 0.
m=audio 48428 RTP/AVP 3 0 8 101.
a=fmtp:101 0-15.
a=rtpmap:101 telephone-event/8000.
a=sendrecv.

________________________________

From: Bogdan-Andrei Iancu [mailto:bogdan at voice-system.ro]
Sent: Thu 23/04/2009 5:50 PM
To: Julien Chavanton
Cc: users at lists.opensips.org
Subject: Re: [OpenSIPS-Users] NAT and ACK (private IP/domain)

HI Julian,

The ACK will be routed based on Route + RURI info. Route hdr made the
ACK to get to .201 and the RURI will continue to .71. The RURI from ACK
is taken from the Contact hdr of the 200 OK reply.

AMybe posting the whole stuff (INVITE+200 OK + ACK) will make things easier.

Regards,
Bogdan

Julien Chavanton wrote:
>
> I have a signaling problem, after connection "200 OK" the "ACK" is not
> sent correctly and the rest of the signaling as well.
>
> Opensips is using the IP in the ACK line instead of the "To:", I am
> wandering how I should handle this  ?
>
> I-phone (Siphone) : julien at osip.dev.com <mailto:julien at osip.dev.com>
> X-lite : 778 at osip.dev.com <mailto:778 at osip.dev.com>
>
> Logging of ACK reception, where the problem start
> Apr 23 13:51:09 osip /sbin/opensips[5446]:
> *****************signaling*****************
> Apr 23 13:51:09 osip /sbin/opensips[5446]: 5 route[ACK][0]
> sip:julien at osip.dev.com ->
> sip:778 at 10.0.1.71:33802;rinstance=8572c408a8cc28e3 START PROCESSING
> MESSAGE
> Apr 23 13:51:09 osip /sbin/opensips[5446]: *** RECORD ROUTE ***
> Apr 23 13:51:09 osip /sbin/opensips[5446]: *** HOST NOT LOCAL *** 
> is_uri_host_local() !
>
> I think this is my problem where the IP apear in the ACK line ?
>
> "ACK sip:778 at 10.0.1.71:33802;rinstance=8572c408a8cc28e3 SIP/2.0."
>
> #
> U 74.56.45.88:5060 -> 10.0.4.201:5060
> ACK sip:778 at 10.0.1.71:33802;rinstance=8572c408a8cc28e3 SIP/2.0.
> Via: SIP/2.0/UDP
> 192.168.1.125:5060;rport;branch=z9hG4bKPjTSq-5uCDumvhdYNtigsDJwPrKvhqMM-C.
> Max-Forwards: 70.
> From: sip:julien at osip.dev.com;tag=3FDO5jkip5p8pkCLNr.3TSz2gNrWxCy..
> To: sip:778 at osip.dev.com;tag=207ac245.
> Call-ID: lywQ33yIAPEOG77lN93EbyXiHxji.FK-.
> CSeq: 31501 ACK.
> Route: <sip:10.0.4.201;lr;nat=yes>.
> Content-Length:  0.
> .
>
> ------------------------------------------------------------------------
>
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>  

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