I think in such cases you get a "parse error" in the log. Do you?
If yes, then Kamailio stops processing the packet and no reply is sent.

Reda



On Tue, Jun 19, 2012 at 7:10 PM, Uri Shacked <ushacked@gmail.com> wrote:
OK understood.
I tried with no "TO" header as well, and still no error reply....
Is there suppose to be a reply from core? 

On Tue, Jun 19, 2012 at 4:12 PM, Andrew Pogrebennyk <apogrebennyk@sipwise.com> wrote:
On 06/19/2012 02:06 PM, Uri Shacked wrote:
> I am testing kamailio replies when an INVITE or another request arrives
> with lets say, "VIA" header missing....
> The core drops the request. But, there is no reply for the originator
> (so it keep on resending the request...)
> Why?

If there was no Via header, the recipient would have no way to know
where to send the response.


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