<div dir="ltr">Mark,<br><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jun 9, 2014 at 2:50 PM, Mark R Lindsey <span dir="ltr"><<a href="mailto:lindsey@e-c-group.com" target="_blank">lindsey@e-c-group.com</a>></span> wrote:<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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2. Increase the ptime from 20 ms to 30-40 ms to reduce packet-drop exposure<br></blockquote></div><div><br></div><div>A good number of years ago (it shocks me to realize it was probably about 10!) I was a product manager for SIP products at one of the IP-PBX vendors. I thought that we ought to be able to do better than having a ptime of only 20 ms and so I did some digging. I was very surprised to see the sheer number of places where there were assumptions made that the ptime would always be 20 ms. In software... in hardware... in applications... not just from the vendor I was with but in the products of other vendors as well. It seemed like most everywhere SIP was deployed there was an assumption of a 20ms ptime - and in many cases no way to use any other value.</div>
<div><br></div><div>Now, obviously a great amount can change in 10 years - or not. (This *is* telecom we're talking about!) My point is really that this one might be extremely hard to change in a way that would be widely useful and interoperable. I realize others have raised technical concerns... mine is more on the deployment side. While I think it is interesting to explore, I think part of that exploration should include whether changing the ptime is something that can actually be done on any kind of realistic timeframe.</div>
<div><br></div><div>Just my 2 cents,</div><div>Dan</div><div><br></div><div><br></div>-- <br><div style="font-size:13px;color:rgb(136,136,136);font-family:arial,sans-serif"><br></div><div style="font-size:13px;color:rgb(136,136,136);font-family:arial,sans-serif">
Dan York</div><div style="font-size:13px;color:rgb(136,136,136);font-family:arial,sans-serif"><a href="mailto:dyork@lodestar2.com" style="color:rgb(0,0,204)" target="_blank">dyork@lodestar2.com</a> <a value="+18027351624" style="color:rgb(0,0,204)">+1-802-735-1624</a> Skype:danyork</div>
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