[asterisk-users] Voice quality issues

[Tzafrir Cohen]

On Sun, Mar 04, 2007 at 11:03:21AM +0000, Alan Chandler wrote:
> Being new to Asterisk, I have set up a little test rig at home.
> 
> Asterisk itself is the Debian Etch package, running on a Celeron 1.7G 
> machine
> 
> I have two clients on a 100Mb LAN, a Windows XP machine with an Athlon 
> XP2200+ processor, and a Linux Core Duo 6300 machine.
> 
> On the windows XP machine I run idefisk.  On the linux machine I can run 
> either idefisk or kiax.  Both of these are obviously IAX clients.

Can they be configured to talk directly to one another?

> 
> When I connect the two of them together, I am getting quite severe sound 
> quality problems in the direction of the linux to windows machine.  The 
> best I can describe it is the sound coming out the windows machine 
> sounds like a Darlek (very tinny sound with high pitched echo sounds).  
> I think it represents an over compression problem.

Can you try an echo test vs. the Asterisk server?

> 
> The sound coming the other way (windows to linux) is fine.
> 
> I was worried about my raw capture capability on linux, so I just tried 
> to record and playback directly on the local machine - but the quality 
> here is good.
> 
> It also appears that the main media stream is not going through the 
> Asterisk server as I have an iptables firewall that is counting iax 
> packets hitting the machine and it is small (in the few tens).
> 
> How can I debug whats wrong here so I can try and correct it.

What codecs do you use?

-- 
               Tzafrir Cohen       
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