[OpenSIPS-Users] Contact - private IP problem

[Nauman Sulaiman]

Hi, we are using OpenSIPS 1.6.2 as an outbound proxy, we have registered with Voipfone to test but the same problem occurs with other Voip providers
Once registered we can't receive incoming calls, if we use STUN on the UAC then we are ok. However we would prefer to handle the nat traversal on the proxy. We have implemented all the code in Flavio's book.

However the contact header sent from the proxy to the Voipfone server has a private ip although it has the nat=yes appended. So something is working please see REGISTER trace below.

We think we are missing something but unsure what.

UAC->Proxy

REGISTER sip:voipfone.co.uk SIP/2.0.
Via: SIP/2.0/UDP 192.168.0.2;rport;branch=z9hG4bKeyaZHZ6DrXptj.
Max-Forwards: 70.
From: <sip:30146027 at voipfone.co.uk>;tag=44U5mK3gB9ZvH.
To: <sip:30146027 at voipfone.co.uk>.
Call-ID: 102ce92b-166c-122e-a99f-37fea39c3827.
CSeq: 134125887 REGISTER.
Contact: <sip:30146027 at 192.168.0.2:5060>.
Expires: 600.
User-Agent: 
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, NOTIFY.
Supported: path.
Authorization: Digest username="30146027", realm="asterisk", nonce="hhvuahjm", algorithm=MD5, uri="sip:voipfone.co.uk", response="4d8dbfef$
Content-Length: 0.
.

Proxy->Voipfone

REGISTER sip:voipfone.co.uk SIP/2.0.
Via: SIP/2.0/UDP 178.235.138.190;branch=z9hG4bK23c.505fb9b2.0.
Via: SIP/2.0/UDP 192.168.0.2;received=88.148.7.122;rport=5060;branch=z9hG4bKeyaZHZ6DrXptj.
Max-Forwards: 69.
From: <sip:30146027 at voipfone.co.uk>;tag=44U5mK3gB9ZvH.
To: <sip:30146027 at voipfone.co.uk>.
Call-ID: 102ce92b-166c-122e-a99f-37fea39c3827.
CSeq: 134125887 REGISTER.
Contact: <sip:30146027 at 192.168.0.2:5060;nat=yes>.
Expires: 600.
User-Agent: 
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, NOTIFY.
Supported: path.
Authorization: Digest username="30146027", realm="asterisk", nonce="hhvuahjm", algorithm=MD5, uri="sip:voipfone.co.uk", response="4d8dbfef$
Content-Length: 0.

Voipfone->Proxy

SIP/2.0 200 OK.
Via: SIP/2.0/UDP 178.235.138.190;branch=z9hG4bK23c.505fb9b2.0;received=178.235.138.190;rport=5060.
Record-Route: <sip:195.189.173.10:5060;lr=on>.
Via: SIP/2.0/UDP 192.168.0.2;received=88.148.7.122;rport=5060;branch=z9hG4bKeyaZHZ6DrXptj.
From: <sip:30146027 at voipfone.co.uk>;tag=44U5mK3gB9ZvH.
To: <sip:30146027 at voipfone.co.uk>.
Call-ID: 102ce92b-166c-122e-a99f-37fea39c3827.
CSeq: 134125887 REGISTER.
Contact: <sip:30146027 at 192.168.0.2:5060;nat=yes>;expires=60.
Expires: 60.
Date: Fri, 30 Jul 2010 15:16:15 GMT.
Min-Expires: 60.
User-Agent: Voipfone.
Content-Length: 0.