Re: [IPFIX] review of draft-scholz-ipfix-rtp-audio-quality-00

Hi Hendrik,

>>>
>>> 3.2.  rtpMOSClass1
>>>
>>>     Description:  Number of seconds the monitored stream had a MOS
>>>        quality lower than 3.10
>>>
>>>     Data Type:  float32
>>
>> It's unusual to represent time as a float in IPFIX. Could you pick a
>> suitable resolution (eg, milliseconds or microseconds) and export an
>> integer?
>>
> The purpose of these IE items is to report the amount of full seconds
> VoIP streams have been in either one of these 5 MOS classes. So I
> suggest to change the type to unsigned64.
> 
> Regards,
> Michael
> 

I did some math and really believe this should be an unsigned 64-bit
value. Since the purpose of this IE is to provide an aggregation over
all flows carried e.g. over a SIP trunk / carrier-interconnection the
worst case would be potentially many millions of flows aggregated.
Reporting the quality like this for a single flow is possible, but
likely not the general application.
A 32-bit resolution to report quality distribution of full day would
only be sufficient for 49k flows or 24k bi-flows / calls. That doesn't
seem to be a lot for quality reporting on a daily basis on a
carrier-interconnection. Therefore unsigned64 with units = seconds seems
for me the way to go.

Regards,
Michael

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