[asterisk-users] Call quality

[Tzafrir Cohen]

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.

-- 
               Tzafrir Cohen
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