Re: Fwd: Comments on draft-niemi-sipping-event-throttle-08.txt

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one extra comment inline:

On Mar 10, 2009, at 10:57 AM, Michael Froman wrote:

Resending in case this got lost in the noise over the last week.

Begin forwarded message:

From: Michael Froman <mfroman@xxxxxxxxxxxx>
Date: March 4, 2009 10:00:10 AM CST
To: sipping@xxxxxxxx
Subject: Comments on draft-niemi-sipping-event-throttle-08.txt

Hello all,

I have a question/concern about the closing paragraphs of 4.2.2, 5.2.2 and 6.3.2. Each of these paragraphs deals with retransmissions of NOTIFY requests and resetting the throttle (or force or average) based on the completion of the previous transaction. Given that the notifier and the subscriber can have different ideas of when the transaction ends (up to T1 I believe),

That "up to T1" is in the _best_ case where there's no retransmission anyhow - in a lossy network, it could be closer to 64*T1.

I want to verify the reasoning behind these paragraphs.

Is the point that throttle/force/average not break the retransmission mechanism or that, for example, retransmissions modify the time between forced NOTIFYs by the time taken for the retransmissions to successfully complete the transaction? An example is the case when the NOTIFY gets to the subscriber quickly, but the 200OK is slow to make it back to the notifier. Start with a force value of 2 seconds. The subscriber thinks the transaction is over and is now expecting a forced NOTIFY 2 seconds from now. The notifier has not completed the transaction. The next NOTIFY from the notifier can happen anytime up to T1 + 2 sec.

I agree that throttle/force/average should not interfere with the normal retransmission mechanism. However, I don't agree that waiting for the transaction to complete before starting the throttle/force/average timer is going to give much benefit (or always predictable results).

Thanks,
Michael.


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_______________________________________________
Sipping mailing list  https://www.ietf.org/mailman/listinfo/sipping
This list is for NEW development of the application of SIP
Use sip-implementors@xxxxxxxxxxxxxxx for questions on current sip
Use sip@xxxxxxxx for new developments of core SIP

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