Re: SIP messages with no/invalid CSeq are dropped by nf_ct_sip, 400 Bad Request is expected instead

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On 24.09, Christophe Leroy wrote:
> I have an issue with the SIP conntrack:
> 
> In commit 30f33e6dee [NETFILTER]: nf_conntrack_sip: support method specific
> request/response handling
> Modified by b20ab9cc63 netfilter: nf_ct_helper: better logging for dropped
> packets
> 
> SIP requests with no CSeq header are dropped by kernel before reaching the
> user app.
> 
> According to RFC4475 "Session Initiation Protocol (SIP) Torture Test
> Messages", requests with invalid CSeq should be responded with 400 Bad
> Request, and that's what my app does, but it can only do it if it receives
> the request.

I don't see anything about missing CSeq-headers in that RFC, could you point
me to the correct chapter?
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