It did help, I read that a couple times already but something is still not right, and its only because of the decoupling of the registrar. I need to do more debugging and see if Im loosing the flag value. Hoping something sticks out that
someone sees and can point me in the right direction.
-dan
On Mar 31, 2020, at 7:15 PM, Alex Balashov <abalashov@evaristesys.com> wrote:
>
> 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@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@cmsinter.net<mailto:dan@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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>>
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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/
>
> _______________________________________________
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>
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