> Let's say the UAC sends two in-dialog requests, with CSeq 100 
> and CSeq 101 respectively, but due to some networking issues, 
> the second request arrives before the first- the UAS receives 
> 101, and then 100. What is the proper response to the request 
> with CSeq 100?

Per rfc3261 section 12.2.2, it MUST be rejected with a 500 response.


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