[Asterisk-Users] Voice Quality

[Mamadou Lamine KA]

Hello David,

Bad voice quality may be caused by many reasons.
I suggest you test the two servers separately first.
Monitor CPU load during calls in each server and verify if the communication
devices used by asterisk (voice boards, network interfaces ... ) don't share
interruptions.
In iax.conf try to replace the two lines
jitterbuffer=200
jitterbuffer=yes
with the six following
jitterbuffer=yes

dropcount=2

maxjitterbuffer=500

maxexcessbuffer=80

minexcessbuffer=10

jittershrinkrate=1

You may also want to take a look at http://www.voip-info.org/wiki-QoS

Regards

Lamine





----- Original Message -----
From: <david at ccds.ca>
To: <asterisk-users at lists.digium.com>
Sent: Tuesday, May 03, 2005 2:51 PM
Subject: [Asterisk-Users] Voice Quality


> Hello,
>
> I have setup two * servers and they are communicating using IAX. I'm
> passing calls from SRV A (internet connection T1) to SRV B (internet
> connection: 512).
>
> For some reasons I have an issue with the quality. The voice is a bit
> scratchy. I have tried iLBC and SPEEX, but it didn't make any difference.
>
> Now, assuming that I have an issue with Bandwidth, what would be the best
> way to configure my iax.conf. (A bit confused about jitterbuffer and tos)
>
> Here is my iax.conf @ location A:
>
> [general]
> port=4569
> bandwidth=low
> disallow=all
> allow=ilbc
> ;allow=ulaw
> ;allow=speex
> jitterbuffer=200
> jitterbuffer=yes
> tos=lowdelay
>
> and iax.conf @ location B:
>
> [general]
> port=4569
> bandwidth=low
> disallow=all
> allow=ilbc
> ;allow=ulaw
> ;allow=speex
> jitterbuffer=200
> jitterbuffer=yes
> tos=lowdelay
>
> [guest]
> type=user
> context=default
> callerid="Guest IAX User"
> disallow=all
> allow=ilbc
>
>
> Thanks guys
>
>
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