Klaus Darilion writes:
> * perform NAT traversal always, unless I know for sure that the client
> does not support symmetric SIP. For doing NAT traversal you can either
> use fix_nated_contact() - which is not standard conform but works - or
> use the new add_contact_alias/handle_ruri_alias (kamailio 3.0:
> http://sip-router.org/docbook/sip-router/branch/master/modules_k/nathelper/nathelper.html#id2806306)
here are the instructions in case someone missed them earlier.
-- juha
add_contact_alias()/handle_ruri_alias() usage example
-----------------------------------------------------
supports re-use of tcp sessions between proxy and UAs. supports routing
of requests to UAs behind NATs so that r-uri is always what UAs expect.
proxying of media is not shown, but can be easily added.
NON_REGISTER_INITIAL_REQUESTS
-----------------------------
- call alias_contact() for all non-register initial requests, which
don't come from another proxy (which takes care of its own UAs).
- if you know that non-register initial request is going to another
proxy, set TO_PROXY flag before relaying the request.
- in cases, where initial request may go to another proxy, but you are
not sure about it, store the number of record-route headers in
incoming request in an AVP that you can then later test in onreply
route and find out, if next hop was a proxy.
route [NON_REGISTER_INITIAL_REQUESTS] {
if (!is_present_hf("Record-Route")) {
route(ADD_CONTACT_ALIAS);
};
...
if (I_KNOW_FOR_SURE_THAT_NEXT_HOP_IS_ANOTHER_PROXY) {
setbflag("TO_PROXY");
};
if (NEXT_HOP_MAY_BE_ANOTHER_PROXY_BUT_I_DONT_KNOW_FOR_SURE) {
$avp("rr_count") = $rr_count;
};
t_on_reply("REPLY");
if (!t_relay()) ...
route [ADD_CONTACT_ALIAS] {
if (!add_contact_alias()) {
xlog("L_ERR", "Error in aliasing contact <$ct>\n");
send_reply("400", "Bad request");
exit;
};
}
REGISTER_REQUESTS
-----------------
- call fix_nated_register() on register requests, if registering ua is
behind nat OR is using tcp.
route [REGISTER_REQUESTS] {
...
if (isflagset(FROM_NATED) || (proto == TCP)) {
fix_nated_register();
if (isflagset(FROM_NATED)) {
setbflag("TO_NATED");
};
};
save("location");
...
IN_DIALOG_REQUESTS
------------------
- call alias_contact() for all in-dialog requests that don't come
from another proxy.
- call handle_ruri_alias() for all in-dialog requests before
t_relaying them to UAs. next hop is an UA if loose_route()
didn't set $du. if next hop is a proxy, set TO_PROXY flag.
route [IN_DIALOG_REQUESTS] {
if (@via[2] == "") {
route(ADD_CONTACT_ALIAS);
}
loose_route();
if ($du == "") {
handle_ruri_alias();
switch ($rc) {
case -1:
xlog("L_ERR", "Failed to handle alias of R-URI <$ru>\n");
send_reply("400", "Bad request");
exit;
case 1:
xlog("L_INFO", "Routing in-dialog $rm from <$fu> to <$du>\n");
break;
case 2:
xlog("L_INFO", "Routing in-dialog $rm from <$fu> to <$ru>\n");
break;
};
} else {
setbflag("TO_PROXY");
}
t_on_reply("REPLY");
if (!t_relay()) {
...
REPLIES
-------
- call add_contact_alias() on all replies except the ones that come from
another proxy.
onreply_route [REPLY] {
if (!isbflagset("TO_PROXY") {
if (is_avp_set("$avp(rr_count)")) {
if ($rr_count == $avp(rr_count) + $rr_top_count) {
route(ADD_CONTACT_ALIAS);
};
} else {
route(ADD_CONTACT_ALIAS);
}
}
...
NOTE
----
- do NOT call fix_nated_contact() on anything, because
add_contact_alias() replaces it.
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