[SR-Users] nathelper without usrloc

[Sergiu Pojoga]

Hi Daniel,

>From what you are describing, my understanding is that the Registrar is the
PBX, kamailio is acting as an edge proxy. If so, doesn't the PBX/registrar
have NAT traversal/keepalive mechanisms of its own?

Regards,
--Sergiu

On Tue, Mar 31, 2020 at 1:55 PM Daniel W. Graham <dan at cmsinter.net> wrote:

> I’ve been missing with this for a while and seem to be missing something.
> Any suggestions on what is missing here?
>
>
>
> Trying to use set_contact_alias() and handle_ruri_alias() from nathelper
> module and nat_keepalive from nat_traversal module, without registrar.
>
>
>
> I had register keepalive working, that has since broke. When register
> keepalive was working, I was able to place call in either direction but ACK
> and BYE was not being routed past kamailio.
>
>
>
> Registrations are forwarded to the PBX using add_path() and is working.
>
>
>
> Also not included below is the routing to the PBX, that is just setting
> $du and t_relay, and is also working.
>
>
>
> Topology is: UA1 -> NAT -> kamailio -> PBX -> UA2
>
>
>
> Using default config file as the example, modified with above changes. I
> also removed RTP config as that is a non-issue.
>
>
>
> request_route {
>
>     ……
>
>     # FLAG MESSAGES FROM PBX
>
>         setflag(FLT_PBX);
>
>     route(NATDETECT);
>
>     ……
>
>
>
> route[NATDETECT] {
>
>             if (nat_uac_test("19")) {
>
> force_rport();
>
>                         set_contact_alias();
>
>                         nat_keepalive();
>
>             }
>
>             return;
>
> }
>
>
>
> route[WITHINDLG] {
>
>             if (!has_totag()) return;
>
>                         if (loose_route()) {
>
>                                     route(DLGURI);
>
>                         } else if ( is_method("ACK") ) {
>
>                                     route(NATMANAGE);
>
>                         } else if ( is_method("NOTIFY") ) {
>
>                                     record_route();
>
>                         }
>
>             route(RELAY);
>
>             exit;
>
>             }
>
>
>
>             if (is_method("SUBSCRIBE") && uri == myself) {
>
>                         route(PRESENCE);
>
>                         exit;
>
>             }
>
>             if ( is_method("ACK") ) {
>
>                         if ( t_check_trans() ) {
>
>                                     route(RELAY);
>
>                                     exit;
>
>                         } else {
>
>                                     exit;
>
>                         }
>
>             }
>
>             sl_send_reply("404","Not here");
>
>             exit;
>
> }
>
>
>
> route[NATMANAGE] {
>
>         if(isflagset(FLT_PBX)) {
>
>             handle_ruri_alias();
>
>     }
>
>     if(!isflagset(FLT_PBX)) {
>
>         set_contact_alias();
>
>     }       return;
>
> }
>
>
>
> route[DLGURI] {
>
>             if(!isdsturiset()) {
>
>                         handle_ruri_alias();
>
>             }
>
>             return;
>
> }
>
>
>
> branch_route[MANAGE_BRANCH] {
>
>             route(NATMANAGE);
>
> }
>
>
>
> onreply_route[MANAGE_REPLY] {
>
>             if(status=~"[12][0-9][0-9]") {
>
>                         route(NATMANAGE);
>
>             }
>
> }
>
> failure_route[MANAGE_FAILURE] {
>
>             route(NATMANAGE);
>
>
>
>             if (t_is_canceled()) exit;
>
>
>
>
>
> -dan
>
>
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