Thanks, Alex and Ovidiu,

Yes, I agree that set_contact_alias () should only be used once.
The essence of the problem is that all external connections are processed as for NAT by default in my script.

Is there any reason for improving the handle_ruri_alias () function so that we can specify the ordinal number of the alias parameter?

пн, 31 мая 2021 г. в 21:10, Ovidiu Sas <osas@voipembedded.com>:

If there are two proxies involved, only one should handle aliases (the
one that is communicating directly with the endpoint).
If a Contact has a private IP, but the request is coming from a proxy
that is in charge of NAT, then the Contact should not be altered. When
you route back in dialog requests, it is ok to have a private IP in
RURI and proper Route headers, The next SIP hop (the other proxy) will
take care of properly routing the request.

Regards,
Ovidiu Sas

On Mon, May 31, 2021 at 1:53 PM Denys Pozniak <denys.pozniak@gmail.com> wrote:
>
> Hello!
>
> I need help understanding how the handle_ruri_alias() function works.
> Call-flow: Upstream operator -> Kamailio Proxy -> Edpoint.
>
> The upstream operator in the initial SIP INVITE in the Contact field sends us an alias parameter, in turn, our Kamailio Proxy adds its own too.
> The Contact after the Proxy looks something like this:
>
> Contact: <sip:10.0.0.115:5060;alias=10.0.0.115~5060~1;alias=3.3.3.3~5060~1>
>
> When the Endpoint sends us a SIP BYE, then the handle_ruri_alias() absorbs not the last alias, but the first one, and this leads to the incorrect formation of a $du.
> The RURI after the Proxy looks something like this:
>
> Request-Line: BYE sip:10.0.0.115:5060;alias=3.3.3.3~5060~1 SIP/2.0
>
> The first thing that comes to mind is a modification of the original Contact field with storing it's within a dialogue ...
>
> Is it possible to elegantly solve this problem?
>
> --
>
> BR,
> Denys Pozniak
>
>
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--
VoIP Embedded, Inc.
http://www.voipembedded.com

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BR,

Denys Pozniak

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