Hi,

The set_contact_alias() / handle_ruri_alias() functions from the `nathelper` module[1] are quite ready-made for this use-case, though you may need a more sophisticated approach if the upstream registrar does not support Path[2][3].

-- Alex

[1] https://kamailio.org/docs/modules/6.0.x/modules/nathelper.html

[2] https://datatracker.ietf.org/doc/html/rfc3327

[3] https://kamailio.org/docs/modules/6.0.x/modules/path.html#path.f.add_path

> On Jul 11, 2025, at 6:19 AM, Antonio via sr-users <sr-users@lists.kamailio.org> wrote:
>
> Hi everyone,
> Do we have a ready-to-use Kamailio role or configuration for:
>
> “Kamailio as a Stateless Smart SIP Proxy”,
> Specifically one that uses Contact Header Encoding?
>
> That is — a proxy where Kamailio does not store registration state,
> but encodes the client’s IP and port into the Contact header during REGISTER,
> and later decodes it from the INVITE to forward the call back to the client.
> Thanks in advance!
> --
>
> Antony
> satskiy.a@gmail.com
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--
Alex Balashov
Principal Consultant
Evariste Systems LLC
Web: https://evaristesys.com, https://www.csrpswitch.com
Tel: +1-706-510-6800

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