[SR-Users] nathelper without usrloc

[Daniel W. Graham]

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 at 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 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/
> 
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