[OpenSIPS-Users] About "nat_traversal" fix_contact()

[Samuel]

Hi Iñaki,

I'm struggling with this NAT traversal module.

I have the following setup:

UA-----NAT box---- P1 ----- P2/REGISTRAR---WORLD!

- I just own P1 configuration (P2 is a voip service provider)

- I can successfully register, and use nat_keepalive and forcerport. 
The SIP Contact is sent from P1 to REGISTRAR with private IP 192.168.a.b
I'm using Path module to send Path header to keep P1 allways in the middle.

- I can establish outgoing calls. Use nat_keepalive and fix_contact().
Contact properly updated and SDP generated by P2 contains the NAT box IP
address. Audio Ok.

- BUT incoming calls do not work. 
Since Path is included the INVITE is properly sent from P2 to P1. But then I
can't find a way to retrieve the public IP of NAT box that is received in
PAth header from P2 to use as destination of packet.

INVITE received from P2:

INVITE sip:9015009 at 192.168.1.103:2907;rinstance=6FF04BD1 SIP/2.0
Via: SIP/2.0/UDP P2IP:5060;branch=z9hG4bKb6j3tfgmmi4809fsu1tp3a5ob0
Call-ID: SDeue3301-75834c789dc311e457f77711e400d33c-gurpko2
CSeq: 1 INVITE
From: "Anonymous"
<sip:Restricted at P2IP>;tag=SDeue3301-21175933_8cce6d4f_2ca134f9-9aef-40e6-9771-00fa9719af6c
To:
<sip:9015009-akfeepv94jd3e at 10.0.5.77:5060;rinstance=6FF04BD1;useradd=P1IP;userport=8891>
Max-Forwards: 69
Contact: "Anonymous" <sip:Restricted at P2IP:5060;transport=udp>
Allow: INVITE
Accept: application/sdp
Anonymity: uri
Min-SE: 90
X-UUID: 6ebba188b5134ab1854da88011983247
Supported: timer,replaces
Content-Disposition: session;handling=required
Content-Type: application/sdp
X-DID: 2815204000
Content-Length: 282
Route: <sip:P1IP:8891;lr;received=sip:xx.xx.xx.xx:46625>

So how to retrieve this received IP xx.xx.xx.xx from INVITE and use it as
destination for my INVITE instead of use the IP received in the RURI?

What is the best way to do it?

Thanks for help,
Samuel





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