Re: [PATCH nf] netfilter: nf_conntrack_sip: allow duplicate SDP expectations

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On Tue, Apr 03, 2018 at 12:10:09PM +0200, Florian Westphal wrote:
> Callum Sinclair reported SIP IP Phone errors that he tracked down to
> such phones sending session descriptions for different media types but
> with same port numbers.
> 
> The expect core will only 'refresh' existing expectation if it is
> from same master AND same expectation class (media type).
> As expectation class is different, we get an error.
> 
> The SIP connection tracking code will then
> 
> 1). drop the SDP packet
> 2). if an rtp expectation was already installed successfully,
>     error on rtcp expectation will cancel the rtp one.
> 
> Make the expect core report back to caller when the conflict is due
> to different expectation class and have SIP tracker ignore soft-error.

Applied, thanks Florian.
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