Harry, You are detecting nat only within this block. if (!is_uri_host_local() || !is_from_local() ) { nat detection ... } This means any request that is not originate from our domain or not for our domain, detect nat. Now, when someone outside send an INVITE to you, it will pass this block, no nat detection, as it is for your domain. Besides, you are setting up a open relay. Anyone can use your server to call someone else. We usually send a 404 response within that block. I suggest you move the nat detection to the very beginning, just after checking max forward and message size. Zeus -----Original Message----- From: harry gaillac [mailto:gaillacharry@yahoo.fr] Sent: Friday, 9 September 2005 6:47 PM To: Zeus Ng Subject: RE: [Serusers] RFC3621 Hello, Thanks for reply. here are my ser.cfg and two ethereal files . You can see I use the latest mediaproxy (1.4.2) look at internal_sip_call file line 15-18 the callee send the public ip in SDP in reply. Look at incoming_call file line 9-10 the calle send its private ip in SDP in reply. This is my problem !! Regards Harry SER I example

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