Re: [PMOL] DISCUSS: draft-ietf-pmol-sip-perf-metrics

[Robert Sparks <[e-mail]>]

PDD is the one I feel strongly about. 

If any of the others risk the same concerns, it would make sense to switch them back too.

RjS

On Jun 3, 2010, at 9:49 AM, Daryl Malas wrote:

> Hi Robert,
> 
> Is it your opinion I switch all of the metrics back to their original names
> or just PDD?
> 
> Regards,
> 
> Daryl
> 
>> 
>> ======= NEW ISSUES with -05 =======
>> 
>> 27 I think relabeling SRD as PDD is a mistake. At the very least it is
>>   a change of such magnitude that it should be re-reviewed by the working
>>   group. SRD as defined by -04 is similar, but not an exact reflection of
>>   PDD. Saying it is "like" Post-Dial-Delay as defined in the PSTN is risky
>>   enough. Using the same name makes it even more likely that someone will
>>   come to the conclusion that it is measuring exactly the same thing. It
>>   does not. For example, it fails to capture any delay from when
>>   the user "finishes dialing" to when the INVITE is generated due to
>>   DNS processing. It would be possible to engineer highly constrained
>>   networks (that didn't use DNS or allow redirection or forking for example)
>>   where the metric might behave very much like PDD in the PSTN, but that
>>   will not be true in the general case.
>> 
>> 
>