[SR-Users] nathelper without usrloc

[Alex Balashov]

Daniel,

Might this article be of aid?

http://www.evaristesys.com/blog/server-side-nat-traversal-with-kamailio-the-definitive-guide/

-- Alex

On Tue, Mar 31, 2020 at 11:12:23PM +0000, Daniel W. Graham wrote:

> 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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-- 
Alex Balashov | Principal | Evariste Systems LLC

Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/