[asterisk-users] Call quality - how to debug

[Steve Howes]

On 2 Jun 2009, at 14:14, Adrian Marsh wrote:

> Hi All,
>
> I’ve a 1.4.15 A*k server supporting several users (approx 80 total,  
> but <10 sim calls usually).  I’ve one user who complains of  
> intermittent bad calls, though I suspect the bad calls are across  
> the board, but intermittent.
>
> Inbound calls are via in IAX trunk from Gradwell. CPU stats say that  
> Asterisk never uses more than 4-5% cpu, systems idle besides that.  
> Memory seems ok too. Network utilisation is < 300kbps.  The voice  
> network (clients + server) sit on their own dedicated 100Mb  
> switches.  Stats from the switch say its lightly loaded.
>
> I’ve turned on voicefile recording.  What we hear, when there is a  
> bad call, is stuttered speech, from BOTH sides (so local SIP client,  
> and remote IAX inbound call).
> Debug from asterisk just shows the call inbound, answered and then  
> hung up as per normal.
>
> I’m at a loss of how to debug the voice issue further, without  
> putting a wireshark PC on the switch, port-mirroring the server and  
> then capturing all of the traffic in a round-robin-type capture and  
> even then I’m not sure what that will achieve.
>
> I’m going to switch from IAX to SIP for the inbound calls for that  
> user and see if that helps.
>
> Any ideas welcome,
>

What internet connection do you have...