[mrtg] Re: Measuring Traffic over FXO / FXS port /Question is changed :)

[Lindahl, Carl]

The amount of VoIP traffic will not be "exact" if you have VAD enabled. It
will not be calculated like a traditional PBX style phone call in the sense
that you take 1 64k trunk to make a phone call. VoIP will only use what
bandwidth it needs, i.e. so if you are talking with someone and they put you
on hold without music, it would easily look like that phone conversation
dropped off, because VAD will not pass a huge 64k (if using 711glaw) RTP
stream, it will be much smaller, i.e. 1k/s.

Just my 2 cents......

-----Original Message-----
From: Bogaç Özdöl [mailto:bogac.ozdol at pargem.com.tr]
Sent: Friday, April 04, 2003 1:54 AM
To: mrtg at list.ee.ethz.ch
Subject: [mrtg] Re: Measuring Traffic over FXO / FXS port /Question is
changed :)


Ok. I should change my question. 

I want to calculate the percentage of outgoing Voip traffic in outgoing
traffic over a Serial (Frame Relay) link.

So is the formula 1 (I mean ...)  
[the size of voice traffic in bytes / the size of outgoing traffic over a
Serial Port (Data+Video+Voice+etc...)= 

Or could I calculate voice traffic with a priority-list 
"access-list 150 permit ip any any precedence critical "

So is the formula 2 (I mean ...)  
( delta count of Voip packets * approximate packet size of used voip codec )

Thanks for advice..








-----Original Message-----
From: mrtg-bounce at list.ee.ethz.ch [mailto:mrtg-bounce at list.ee.ethz.ch]On
Behalf Of Daniel J McDonald
Sent: Thursday, April 03, 2003 4:10 PM
To: Bogaç Özdöl
Cc: mrtg at list.ee.ethz.ch
Subject: [mrtg] Re: Measuring Traffic over FXO / FXS port


On Thu, 2003-04-03 at 04:03, Bogaç Özdöl wrote:
> Hi All ,
> 
> How could I get traffic over FXS or FXO port with mrtg ?
> ifInOctets/ifOutOctets doesn't works... :)

What do you mean by traffic?  FXO and FXS don't carry bits....

If you mean you want to track the traffic generated by a voip
application feeding particular ports, well...  I did something like that
once, but the mibs are pretty nasty to work with.  I ended up using
radius accounting to get what I wanted and dumped it into a mysql
database.  Then, in mrtg I wrote a script that would query for the most
recent numbers and update it...  But it wasn't a very clean solution,
because you get all of the bits at the end of a call (e.g., a 1 hour
call has zero bits for the first 11 polling intervals, then a huge spike
on the 12th).  I ended up just counting the number of up interfaces so I
could figure out how many simultaneous calls I had in progress, and used
the database to calculate cost savings on the back-end.

In any respect, mrtg didn't really help with that application...

> 
> Thanks ...
> 
> 
> Saygilarimla
>    
> Emin Bogaç ÖZDÖL
> 
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