[asterisk-users] Call quality

[Steve Davies]

2008/7/1 Loic Didelot <ldidelot at mixvoip.com>:
> 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
>
> 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.
>

Which version of asterisk/zaptel, and which echo canceler is running in Zaptel?

Regards,
Steve