[SR-Users] Rtpproxy and UPDATEs

[Spencer Thomason]

Hello,
I'm working on a residential type application where we are using Kamailio for NAT traversal and Freeswitch as a voicemail and media server.  When a UA that is behind NAT sends an INVITE to check voicemail everything works correctly until the user listens to the message.  The sdp in the initial INVITE is rewritten and rtp proxy is working but Freeswitch (on a public IP) then sends an UPDATE to display the caller name of the person who left the message.  The problem is that the UAC (in this case a Polycom phone) then responds with its private IP in the SDP.  Is there a was to handle these UPDATEs?  I'm using Kamailio 3.2.3 with a fairly stock config.  This is an excerpt of the config file with the NAT handling route:

# RTPProxy control
route[NATMANAGE] {
    if (is_request()) {
        if(has_totag()) {
            if(check_route_param("nat=yes")) {
                setbflag(FLB_NATB);
            }
        }
    }
    if (!(isflagset(FLT_NATS) || isbflagset(FLB_NATB)))
        return;

    rtpproxy_manage();

    if (is_request()) {
        if (!has_totag()) {
            add_rr_param(";nat=yes");
        }
    }

    if (is_reply()) {
        if(isbflagset(FLB_NATB)) {
            fix_nated_contact();
        }
    }
    return;
}


Thanks,
Spencer