Olá David!
I had to go to some of my scripts from long-long time ago to remember some
bits of the privacy handling.
The default behaviour of the sanity module is that it will 420 a request if
it contains a Proxy-Require tag that Kamailio doesn’t list as supported.
That behavior comes from the proxy_require check (bit 512) inside
sanity_check(): if that check is enabled and the tag isn’t whitelisted in
the module’s proxy_require parameter, the module sends 420 Bad Extension
with Unsupported: "<tag X>".
You can bypass that behaviour with :
modparam("sanity", "proxy_require", "privacy");
And as you mentioned, you can also disable it by clearing bit 512 from your
defaults (your 3047 − 512 = 2535 as you said):
modparam("sanity", "default_checks", 2535);
And, aparently, from what I could confirm in Kamailio docs, I think you
should be able to do this too:
*"This parameter controls whether the module drops the SIP message
automatically if the sanity checks fail. Default value is 1 (auto drop). If
set to 0, sanity_check() function will return -1 (false) to configuration
file, allowing to write log messages for example - be sure
you “exit” execution of config without sending a SIP reply because it is
sent by module itself."*
modparam("sanity", "autodrop", 0)
Atenciosamente / Kind Regards / Cordialement / Un saludo,
*Sérgio Charrua*
*www.kahea.ai <http://www.kahea.ai> / www.voip.pt <http://www.voip.pt>*
*OpenTelecom* - Consulting for Telecoms, Lda
Tel.: +351 <callto:+351+91+104+12+66>91 631 11 44
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On Thu, Nov 13, 2025 at 9:32 AM David Costa via sr-users <
[email protected]> wrote:
> Hello,
>
>
>
> When my kamailio 5.8.2 receives an INVITE with header “Proxy-Require:
> privacy” it replies “420 Bad Proxy Require Extension” with “Unsupported:
> privacy”, but we are treating privacy on our code.
>
>
>
> Is the default behavior for sanity Proxy-Require validations rejecting
> calls with “420 Bad Proxy Require Extension” ?
>
>
>
> If default behavior for sanity Proxy-Require validations is rejecting
> calls with “420 Bad Proxy Require Extension” , I can use
> “modparam("sanity", "proxy_require", "privacy")”.
>
>
>
> Or based on
> https://lists.kamailio.org/pipermail/sr-users/2015-August/089636.html
> the best approach to solve this is subtract 512 from proxy_require to
> kamailio default sanity value 3047 using modparam("sanity",
> "default_checks", 2535)?
>
>
>
>
>
> Thanks,
>
> David Costa
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