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--></style></head><body 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></body></html>