<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-family: Calibri, sans-serif;"><div><div>This goes back to my earlier question on a different thread</div><div><br></div><div>To what extent is the industry using Successful Session Setup (SRD) & Failed Session Setup SRD as specified in IETF RFC 6076 , as a precisely defined SIP equivalent of PDD?</div><div><br></div><div> Are there any deficiencies in SRD that make it not suitable?</div><div><br></div><div>If the industry could standardize on these KPI’s, then the vendors (Asterisk etc ) could build to them and we’d all have something to do apples v apples comparison between carriers.</div><div><br></div><div>Thanks</div><div>Richard</div><div><br></div><div> www.teraquant.com</div><div><br></div><div></div></div><div><br></div><span id="OLK_SRC_BODY_SECTION"><div style="font-family:Calibri; font-size:11pt; text-align:left; color:black; BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt"><span style="font-weight:bold">From: </span> Ivan Kovacevic <<a href="mailto:ivan.kovacevic@startelecom.ca">ivan.kovacevic@startelecom.ca</a>><br><span style="font-weight:bold">Date: </span> Tuesday, April 21, 2015 at 2:02 PM<br><span style="font-weight:bold">To: </span> Alex Balashov <<a href="mailto:abalashov@evaristesys.com">abalashov@evaristesys.com</a>>, <<a href="mailto:voiceops@voiceops.org">voiceops@voiceops.org</a>><br><span style="font-weight:bold">Subject: </span> Re: [VoiceOps] Easy ways to measure PDD<br></div><div><br></div><blockquote id="MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE" style="BORDER-LEFT: #b5c4df 5 solid; PADDING:0 0 0 5; MARGIN:0 0 0 5;"><div><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"><meta name="Generator" content="Microsoft Word 15 (filtered medium)"><style><!--
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--></style><div lang="EN-CA" link="#0563C1" vlink="#954F72"><div class="WordSection1"><p class="MsoPlainText">Alex, </p><p class="MsoPlainText"> </p><p class="MsoPlainText">That's exactly what we do. And the only other twist, since we work with a lot of dialer traffic, is that the originator may hang up before 180/183/200 come through. So the whole 20-30 second non-connected call may be PDD. </p><p class="MsoPlainText"> </p><p class="MsoPlainText">To operationalize the data and make it actionable, we measure prevalence of 8+second PDD (arbitrary) calls by provider. If it exceeds 20% (also arbitrary) in any 15 minute interval we flag it, run some examples and send to the NOC team to investigate/escalate with the provider. </p><p class="MsoPlainText"> </p><p class="MsoPlainText">We have just started doing this, and have gone from being driven by client-reported issues to proactively chasing after providers to fix it… and we are definitely starting to see some improvements, as well as patterns. </p><p class="MsoPlainText"> </p><p class="MsoPlainText">The hope is we can further tighten the parameters to keep the offending calls to sub 10%. </p><p class="MsoPlainText"> </p><p class="MsoPlainText">Best Regards,</p><p class="MsoPlainText"> </p><p class="MsoPlainText">Ivan Kovacevic</p><p class="MsoPlainText">Vice President, Client Services</p><p class="MsoPlainText">Star Telecom | <a href="http://www.startelecom.ca">www.startelecom.ca</a> | SIP Based Services for Contact Centers</p><p class="MsoPlainText"> </p><p class="MsoPlainText"> </p><p class="MsoPlainText"><span lang="EN-US" style="">-----Original Message-----<br>From: VoiceOps [mailto:<a href="mailto:voiceops-bounces@voiceops.org">voiceops-bounces@voiceops.org</a>] On Behalf Of Alex Balashov<br>Sent: Tuesday, April 21, 2015 3:51 PM<br>To: <a href="mailto:voiceops@voiceops.org">voiceops@voiceops.org</a><br>Subject: Re: [VoiceOps] Easy ways to measure PDD</span></p><p class="MsoPlainText"> </p><p class="MsoPlainText">Our practice suggests that it's perfectly safe to measure time difference between processing of initial INVITE and either (a) non-100 1xx response (either 183+SDP or 180) or (b) final affirmative answer (2xx).</p><p class="MsoPlainText"> </p><p class="MsoPlainText">-- Alex</p><p class="MsoPlainText"> </p><p class="MsoPlainText">On 04/21/2015 03:45 PM, Calvin E. wrote:</p><p class="MsoPlainText"> </p><p class="MsoPlainText">> Regarding the other discussion of what PDD is in SIP signalling versus </p><p class="MsoPlainText">> real human experience, it all depends what you're looking for and how </p><p class="MsoPlainText">> you're willing to find it.</p><p class="MsoPlainText"> </p><p class="MsoPlainText"> </p><p class="MsoPlainText">--</p><p class="MsoPlainText">Alex Balashov | Principal | Evariste Systems LLC</p><p class="MsoPlainText">303 Perimeter Center North, Suite 300</p><p class="MsoPlainText">Atlanta, GA 30346</p><p class="MsoPlainText">United States</p><p class="MsoPlainText"> </p><p class="MsoPlainText">Tel: +1-800-250-5920 (toll-free) / +1-678-954-0671 (direct)</p><p class="MsoPlainText">Web: <a href="http://www.evaristesys.com/"><span style="color:windowtext;text-decoration:none">http://www.evaristesys.com/</span></a>, <a href="http://www.csrpswitch.com/"><span style="color:windowtext;text-decoration:none">http://www.csrpswitch.com/</span></a> _______________________________________________</p><p class="MsoPlainText">VoiceOps mailing list</p><p class="MsoPlainText"><a href="mailto:VoiceOps@voiceops.org"><span style="color:windowtext;text-decoration:none">VoiceOps@voiceops.org</span></a></p><p class="MsoPlainText"><a href="https://puck.nether.net/mailman/listinfo/voiceops"><span style="color:windowtext;text-decoration:none">https://puck.nether.net/mailman/listinfo/voiceops</span></a></p></div></div></div>
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