[Serusers] Nathelper question
Zeus Ng
zeus.ng at isquare.com.au
Sat Jul 10 07:31:29 CEST 2004
The following routine should give you a general idea how to handle this
situation. Basically, don't do rtp proxy when both caller and callee are
behind same NAT. Just change their contact address for signalling.
Flag 4 is set when the caller is behind NAT.
Flag 5 is set when the callee is behind NAT.
if (method=="INVITE") {
if (isflagset(4) && isflagset(5)) { /* NAT source & NAT dest. */
if (!exec_msg('echo $SIP_RURI | cut -d: -f2 | cut -d@ -f2 | grep
"$SIP_SRCIP" > /dev/null')) {
xlog("L_NOTICE", "UAs behind different NAT devices, forcing
rtpproxy\n");
force_rtp_proxy();
t_on_reply("2");
} else {
xlog("L_NOTICE", "UAs behind same NAT devices\n");
t_on_reply("3");
}
... Other situation, NAT -> Public, Public -> NAT ...
}
onreply_route[2] {
if (t_check_status("200") || t_check_status("183")) {
if (isflagset(5)) {
fix_nated_contact();
};
force_rtp_proxy();
};
};
onreply_route[3] {
if (t_check_status("200") || t_check_status("183")) {
if (isflagset(5)) {
fix_nated_contact();
};
};
};
>
> Another question, what happen if two people on the SAME LOCAL
> network try to call each other via my SER server ?
>
> Their adress will be detected as private and rtpproxy will be
> use, but it's not needed as they are visible for each other.
>
> How could i prevent this ?
>
> Thanks
>
> _______________________________________________
> Serusers mailing list
> serusers at lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers
>
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