Not really a great answer for you, but I think you should reconsider using 
`topos` to reduce SIP message size. 

`topos` is complex and I'm not sure the added complexity pays off in this case, 
from a purely thermodynamic point of view.

> On 26 Feb 2024, at 06:11, Benoit Panizzon via sr-users 
> <sr-users@lists.kamailio.org> wrote:
> 
> Hi
> 
> I'm having another go at topos trying to solve an issue of sip messages
> getting to big for certain clients to process.
> 
> Unfortunately some methods (ACK/PRACK/BYE probably CANCEL) do not
> contain a contact header, therefore the topology is still revealed (and
> potentially a lot of via header inserted increasing message size).
> 
> Is it safe to set methods_nocontact to an empty string to force
> creation of a Contact header for every SIP method?
> 
> Is there another way to completely hide topology aka keeping header
> small?
> 
> Mit freundlichen Grüssen
> 
> -Benoît Panizzon-
> -- 
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