Subject: RE: [Megaco] Calculation for delay statistic in RTP package

From: "Kevin Boyle" <[email-masked]>
Date: Fri, 2 Dec 2005 09:02:07 -0500

Thus far, those that have been polled have unanimously indicated that
rtp/delay should be calculated as the round-trip propagation delay
defined in RFC 3550.  The number of tallies is relatively small,
however.  If you have an implementation that differs from this, now is
the time to speak up.  If I do not hear significant opposition to this
definition, it will be accepted into the H.248 Subseries IG as a
clarified definition of rtp/delay.

Kevin
Rapporteur ad interim, Q3/16

-----Original Message-----
From: [email-masked] [mailto:[email-masked]] On Behalf
Of Boyle, Kevin [NCRTP:3Z40:EXCH]
Sent: Wednesday, November 30, 2005 2:48 AM
To: [email-masked]
Subject: [Megaco] Calculation for delay statistic in RTP package

All,
 
At the Q.3/16 meeting this week, a contribution was brought that seeks
to clarify the calculation for the delay statistic in the RTP package.
Before making a change, I wanted to poll the list to see how existing
implementations are calculating this stat.  The goal is to ensure that
the proposed definition does not conflict with the majority
interpretation.
 
Please respond to the list or me directly with the following information
about your implementation if you are willing to be tallied.  This
information will be used for the determination of the appropriate change
to the text, and will not be used for any other purpose.
 
"Our implementation calculates delay as:

*	propagation delay in the sending direction
*	propagation delay in the receiving direction
*	round-trip propagation delay as defined by RFC 3550
*	round-trip delay as defined by RFC 3550
*	estimated mean oneway propagation delay based on the measured
round-trip delay
*	the delay since last SR report in accordance with RTCP
*	other (explain)"

Thank you for your help,
 
Kevin
Rapporteur ad interim, ITU-T Q3/16

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