I added a call to add_uri_param("nat=yes") before auth_challenge("$fd", "0"), but couldn't see any difference in the actual SIP messages. The challenge (and the response) didn't contain that newly added keyword. Or am I missing something here?
On Fri, 28 Feb 2020 at 13:58, David Villasmil < david.villasmil.work@gmail.com> wrote:
There probably is a better way of doing this, but maybe you can store the fact that the first register came from a natted device in the locations table (or a hash).
Or maybe add a parameter when challenging where you state the client is natting?
Something like this
https://kamailio.org/docs/modules/3.1.x/modules_k/siputils.html#id2769802
Hope that helps
David
On Fri, 28 Feb 2020 at 12:03, Awal Junanto a.junanto@gmail.com wrote:
Hi,
We are building a service where we need to detect NAT when the clients register to our server. We are struggling in analyzing NAT status of some clients which modify their IP addresses/ports in the headers according to the value of "received" parameter sent during "401 Unauthorized" response.
Here's the flow:
Client->Server REGISTER sip:... Via: SIP/2.0/TLS 192.168.0.1:41157 ;rport;branch=z9hG4bKPj30093e5d-550d-4d4c-a9a2-22c3bd1cda7e;alias Contact: sip:user@192.168.0.1:42251;transport=TLS;ob ... Server->Client SIP/2.0 401 Unauthorized Via: SIP/2.0/TLS 192.168.0.1:41157 ;rport;branch=z9hG4bKPj30093e5d-550d-4d4c-a9a2-22c3bd1cda7e;alias;received=1.2.3.4 WWW-Authenticate: ... ...
Client->Server REGISTER sip:... Via: SIP/2.0/TLS 1.2.3.4:6201 ;rport;branch=z9hG4bKPj30093e5d-550d-4d4c-a9a2-22c3bd1cda7e;alias Contact: <sip:user@ 1.2.3.4:6201;transport=TLS;ob> Authorization: ... ...
By the time the client is authenticated, there is no way to detect whether the request was coming from a natted device or not by just analysing the Via or Contact headers.
Thanks in advance.
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-- Regards,
David Villasmil email: david.villasmil.work@gmail.com phone: +34669448337 _______________________________________________ Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users