[OpenSIPS-Users] Accounting modules differences between duration and ms_duration fields

[Liviu Chircu]

Hi Arto,


Second-precision does not imply "differences are always positive". If a 
call starts at second offset 1.999 and ends at 2.000, it will have 
incorrectly lasted 1 second instead of 0 seconds. Conversely, if it 
starts at second offset 2.000 and ends at 2.999, the duration will be 0 
seconds, instead of 1.


In other words, the expected error of the "duration" column is anything 
between [-0.(9), +0.(9)] seconds. If this is not enough for you, you 
should only make use of "ms_duration", which has an expected error of 
[-0.(9), +0.(9)] milliseconds.


I hope this clears things up,

Liviu Chircu
OpenSIPS Developer
http://www.opensips-solutions.com

On 30.04.2018 13:57, Arto Kuiri wrote:
> Hi,
>
> I have noticed n accounting module that there seems to be differences 
> between cdr fields "duration" and "ms_duration".
>
> You can notice it even from opensips documentation:
> http://www.opensips.org/Documentation/Tutorials-Advanced-Accounting#toc11
>
> If you check CDR example:
> ACC: call ended: created=1474639265;call_start_time=1474639281;\
>
> duration=5;ms_duration=4250;setuptime=16;method=INVITE;from_tag=1515466979;\
> to_tag=1284910.0.0.1351;call_id=1766189979;code=200;reason=OK
>
> ms_duration= 4250 and still duration field is 5, although it should be 
> 4 ?
>
> I first thought that it could be that duration is rounded up, but we 
> have cdr's where duration is rounded down,
> like ms_duration 1926 => duration 1.
>
> Any idea why it behaves like that?
>
> Regards,
> Arto Kuiri
>
>
>
>
>
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