[SR-Users] nathelper without usrloc

[Daniel W. Graham]

It does but doesn't work as well as kamailio, and since the proxy is the entry point.

The biggest issue here isnt the keepalive, as I did have that working. The main issue is the routing of messages, utilizing set_contact_alias and handle_ruri_alias, as Ive been unable to get ack and bye messages to make it past the proxy. I’m assuming these functions are not being used at the right locations or I need to rely on another mechanism to accomplish it. I also question my use of the PBX flag and the natmanage logic.

-dan

On Mar 31, 2020, at 7:01 PM, Sergiu Pojoga <pojogas at gmail.com> wrote:


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<mailto: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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