I resolved all of the routing issues. Only issue I’ve got now is nat_keepalive not working when used with set/add_contact_alias().
-dan
From: "miconda@gmail.com" miconda@gmail.com Reply-To: "miconda@gmail.com" miconda@gmail.com Date: Friday, April 3, 2020 at 1:43 PM To: Daniel Graham dan@cmsinter.net, "Kamailio (SER) - Users Mailing List" sr-users@lists.kamailio.org Subject: Re: [SR-Users] nathelper without usrloc
Somehow I thought that the keepalive is not working and you look for fixing it. Now I read the full thread and actually the routing of requests within dialog doesn't work.
Can you send a pcap with such a call taken on Kamailio system? ACK and BYE should be routed based on Contact of INVITE/200ok and record-route headers, no longer related to REGISTER (only initial INVITE should rely on registration data).
Cheers, Daniel On 02.04.20 22:11, Daniel W. Graham wrote: Same behavior with add_contact_alias()
-dan
From: "miconda@gmail.com"mailto:miconda@gmail.com miconda@gmail.commailto:miconda@gmail.com Reply-To: "miconda@gmail.com"mailto:miconda@gmail.com miconda@gmail.commailto:miconda@gmail.com Date: Thursday, April 2, 2020 at 2:59 PM To: "Kamailio (SER) - Users Mailing List" sr-users@lists.kamailio.orgmailto:sr-users@lists.kamailio.org, Daniel Graham dan@cmsinter.netmailto:dan@cmsinter.net Subject: Re: [SR-Users] nathelper without usrloc
Hello,
can you try with add_contact_alias() instead of set_contact_alias()? The second one updates the contact URI in a way that is visible for the couple of local modules immediately, typically needed when having dialog/presence module in that instance (still no changes to the header itself, it uses some internal mechanism to signal contact value should be taken from a special field). The first one uses the lumps system that makes the changes over the contact URI not visible immediately (unless msg_apply_changes() is used).
Maybe nat_keepalive() needs the original contact URI, not the one updated by set_contact_alias().
Cheers, Daniel On 02.04.20 18:45, Daniel W. Graham wrote: I was able to fix all issues, but have one partially lingering.
For register only, if I apply: set_contact_alias() with nat_keepalive(), keepalives are not sent. Removing set_contact_alias() fixes this.
I *shouldn’t need this if the pbx was saving received and rport params as a result of add_path_received().
Can anyone explain why these two functions conflict?
Test scenario - # Doesn’t result in register keepalive –
route[NATDETECT] { force_rport(); set_contact_alias(); # removal of this enables keepalive nat_keepalive(); return; }
I’ve tested this with and without calls to handle_ruri_alias() elsewhere in cfg script with same result.
-dan
From: sr-users sr-users-bounces@lists.kamailio.orgmailto:sr-users-bounces@lists.kamailio.org on behalf of Sergiu Pojoga pojogas@gmail.commailto:pojogas@gmail.com Reply-To: "Kamailio (SER) - Users Mailing List" sr-users@lists.kamailio.orgmailto:sr-users@lists.kamailio.org Date: Wednesday, April 1, 2020 at 8:58 AM To: "Kamailio (SER) - Users Mailing List" sr-users@lists.kamailio.orgmailto:sr-users@lists.kamailio.org Subject: Re: [SR-Users] nathelper without usrloc
Nothing else comes to mind based on info provided. May be you can send some sip traffic captures and elaborate?
Regards, --Sergiu
On Tue, Mar 31, 2020 at 10:29 PM Daniel W. Graham <dan@cmsinter.netmailto:dan@cmsinter.net> wrote: Thanks, yeah I had already changed that, but registration works with either. I’m not asking for a solution, just looking for suggestions on anything that needs attention, so I appreciate your pointers.
-dan On Mar 31, 2020, at 8:55 PM, Sergiu Pojoga <pojogas@gmail.commailto:pojogas@gmail.com> wrote:
Oh and almost forgot - try add_path_received() instead of add_path()
Good luck!
On Tue, Mar 31, 2020 at 8:48 PM Sergiu Pojoga <pojogas@gmail.commailto:pojogas@gmail.com> wrote: A lot of things may not be 'right' here, unfortunately your question is too broad to answer and too little info, the topology is indeed non-default and I doubt someone will present you with a final solution (there's business support, if you're looking for that).
Otherwise, if I were to just throw a guess: - try fix_nated_register() (instead of set_contact_alias) just for Register method on the way to the registrar - in the Registrar, make sure the Contact's Path address is correct
Cheers, --Sergiu
On Tue, Mar 31, 2020 at 7:34 PM Daniel W. Graham <dan@cmsinter.netmailto:dan@cmsinter.net> wrote: 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.commailto:abalashov@evaristesys.com> wrote:
Daniel,
Might this article be of aid?
http://www.evaristesys.com/blog/server-side-nat-traversal-with-kamailio-the-...
-- 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.commailto: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.netmailto:dan@cmsinter.net<mailto:dan@cmsinter.netmailto: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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