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-----Original Message-----
From: Paul Kyzivat (pkyzivat)
Sent: Saturday, December 01, 2007 2:31 PM
To: DRAGE, Keith (Keith)
Cc: sip at ietf.org
Subject: Re: [Sip] Comments on draft-kaplan-sip-info-events-00
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.
But if the INFO is used for dtmf, the rejected request will be a problem
as it will result in loss of digit information. So I think package type
should define whether it is ok to send overlapping requests or not.
Sanjay
The end result is that you can get *nondelivery* of a message,
but not *out of order delivery*.
Thanks,
Paul
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