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

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Hi,

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.

How can we solve that ?

Christophe
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