Re: [Sip] Comments on draft-kaplan-sip-info-events-00

[Paul Kyzivat <pkyzivat at cisco.com>]

Keith,

A comment about one of your points:

DRAGE, Keith (Keith) wrote:

> In particular, one area which needs to be covered is
> how the embedded information tranfer caters for out of sequence
> delivery, given that the carriage mechanism does not guarantee order of
> delivery in all circumstances of SIP usage.

I'm wondering what you have in mind here.

It is possible to send request R1 then send R2 before getting a response 
to R1. And then it is possible for R2 to arrive before R1, and in that 
case it will be accepted. But then, when R1 arrives there will be a CSeq 
error so it will be rejected.

The end result is that you can get *nondelivery* of a message, but not 
*out of order delivery*.

	Thanks,
	Paul


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