[VoiceOps] Easy ways to measure PDD

Richard Jobson richard at teraquant.com
Wed Apr 22 12:01:00 EDT 2015

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 KPI¹s, then the vendors (Asterisk
etc ) could build to them and we¹d all have something to do apples v apples
comparison between carriers.



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 itŠ 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
> Tel: +1-800-250-5920 (toll-free) / +1-678-954-0671 (direct)
> Web: http://www.evaristesys.com/ <http://www.evaristesys.com/> ,
> http://www.csrpswitch.com/ <http://www.csrpswitch.com/>
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