[asterisk-users] Call quality

[Loic Didelot]

The problem appears mostly on outgoing calls SIP-PSTN but not only. 10%
of all alerts are internal calls. I had the chance to notice the problem
once myself but I could never again reproduce.  

Best regards,
Loic Didelot.

On Tue, 2008-07-01 at 18:03 +0300, Tzafrir Cohen wrote:
> On Tue, Jul 01, 2008 at 02:38:25PM +0200, Loic Didelot wrote:
> > Hello,
> > one of my customers complained about bad voice quality on several calls,
> > so I programmed a button on each phone which users can hit if they have
> > audio drops and echo.
> > 
> > I did this to check if there is a common recurrent problem to a given
> > destination or just for one user etc... But till now I could not detect
> > a pattern which could explain the problems
> > 
> > This "alert button" is pressed between 7%-10% of all calls. The customer
> > has 25 phones and around 300 calls per day.
> > 
> > The SNOM phones are connected to Linksys switches and are totaly split
> > from the computers network. The same goes for the asterisk box. No calls
> > are routed trough the internet.
> > Phone -> Local Lan -> Asterisk -> Zaptel (Junghanns BRI card) -> Carrier
> 
> Are the problems in SIP->PSTN calls? SIP->SIP calls?
> PSTN->Local? (echo test, playback, whatever)
> 
> SIP->PSTN or PSTN->SIP (what direction is the call)?
> 
> 7% is something you have hope of reproducing. Unless you miss the real
> factor. Have you managed to reproduce it yourself?
> 
> > 
> > The carrier we use is known for his good quality and we never had a
> > problem. It is the historic and most expensive carrier in Luxembourg.
> > 
> > Asterisk is running on a 1GHZ VIA CPU with 1GB RAM box. They have a
> > maximum of 6 concurrent calls.
> > 
> > Maybe someone can help me to track down the problem. What should I
> > check, monitor test. Any ideas are welcome.
> 
-- 
Loïc DIDELOT
MIXvoip S.a.
ldidelot at mixvoip.com
http://www.mixvoip.com