This goes back to my earlier question on a different thread 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? Are there any deficiencies in SRD that make it not suitable? 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. Thanks Richard www.teraquant.com From: Ivan Kovacevic <ivan.kovacevic at startelecom.ca> Date: Tuesday, April 21, 2015 at 2:02 PM To: Alex Balashov <abalashov at evaristesys.com>, <voiceops at voiceops.org> Subject: Re: [VoiceOps] Easy ways to measure PDD
Alex,
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.
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.
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.
The hope is we can further tighten the parameters to keep the offending calls to sub 10%.
Best Regards,
Ivan Kovacevic Vice President, Client Services Star Telecom | www.startelecom.ca <http://www.startelecom.ca> | SIP Based Services for Contact Centers
-----Original Message----- From: VoiceOps [mailto:voiceops-bounces at voiceops.org] On Behalf Of Alex Balashov Sent: Tuesday, April 21, 2015 3:51 PM To: voiceops at voiceops.org Subject: Re: [VoiceOps] Easy ways to measure PDD
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).
-- Alex
On 04/21/2015 03:45 PM, Calvin E. wrote:
Regarding the other discussion of what PDD is in SIP signalling versus real human experience, it all depends what you're looking for and how you're willing to find it.
-- Alex Balashov | Principal | Evariste Systems LLC 303 Perimeter Center North, Suite 300 Atlanta, GA 30346 United States
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