SDP Issue on NAT environment

Nathan C via sr-users <[email protected]>
Newsgroups gmane.comp.voip.ser
Message-ID <[email protected]>
Hello,
I have a kamailio on SITE A using a public IP.
I'm trying to setup another kamailio on SITE B with NAT.

When I try to make a call from SITE B to SITE A, the call is initiated but when comes the SDP my equipment on SITE B does not reply to SDP sent by kamailio on SITE A.

I made some test and use only Public IP between the 2 sites and it works properly. So I think that I have a problem on my NAT configuration or maybe I'm missing something.
Can someone help me one this problem ? Do you have an idea on what could be blocking. 
Thank in advance for your help.
Regards,
Nathan
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