Re: Kamailio as a Stateless Smart SIP Proxy

Thanks for the reply

I want to use Kamailio as a proxy, but a *smart one*.
It doesn't store anything, but:
• Modifies REGISTER requests → adds the client's IP/port to Contact
• So when the PBX sends an INVITE back, Kamailio reads this data from the
R-URI and forwards the call to the client

Hope it makes sense.


On Fri, Jul 11, 2025 at 10:14 PM Alex Balashov via sr-users <
[email protected]> wrote:

> 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 <
> [email protected]> 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
> > [email protected]
> > __________________________________________________________
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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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> [email protected]
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>


-- 

*Antony*
[email protected]

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