[Serusers] succesive calls rejected (radius+mediaproxy)

[miliczo]

Hallo,
 i'm using radius+mediaproxy and since I moved my sip proxy on a public ip I have the folowing problem. I log in regulary and make my firs call with no problem. But When I hung up, and after few minutes call again, my proxy wont authorise me. I get a message that I need to authorise with proxy. During that my FRERADIUS is recieving requests for authorisation. The second i get rejected i call again and it connects me.
 I tried lowering nat_ping intervals but no succes.

my Invite snippet is a common one:

        sl_send_reply("100", "Trying");

        if (!radius_proxy_authorize("")) {
                proxy_challenge("","0");
                break;
        } else if (!check_from()) {
                sl_send_reply("403", "Use From=ID");
                break;
        };
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