[Asterisk-Users] IAX choppy sound

[Stojan Sljivic - GDS]

Hi Tim,

> Just to check, can you get decent call quality between 2 IAX 
> clients on 
> the same
> (local server)?
I have never tested that since we have no IAX phones. 
We use SIP phones and IAX is used for connecting two Asterisk servers.

Regards,
Stojan Sljivic 


> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com 
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of 
> Tim Panton
> Sent: Wednesday, March 15, 2006 13:08
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [Asterisk-Users] IAX choppy sound
> 
> 
> 
> On 15 Mar 2006, at 09:02, Stojan Sljivic - GDS wrote:
> 
> > Hi,
> >
> >> Are you using Trunked IAX?
> > Currently we do not use trunking.
> >
> >> How many calls at a time?
> > All the test we have performed so far were with only one 
> active call.
> >
> >> What codecs are you using?
> > We have set the bandwith=low, so I think that G.723.1, GSM, 
> and LPC10
> > are in
> > the play.
> 
> If you have 256kbits/s available and want to make a maximum 
> of 2  calls you could try something using ulaw (~80kbits/s) 
> anyhow, I would explicitly set the codec so that you can compare them.
> eg:
> 
> disallow=all
> allow=ulaw
> 
> 
> >
> >> What is the ping time between the systems?
> > Ping stats are:
> > Server 1:
> > 50 packets transmitted, 50 received, 0% packet loss, time 
> 49491ms rtt 
> > min/avg/max/mdev = 190.198/213.028/283.275/25.307 ms
> 
> 
> > Server 2:
> > 50 packets transmitted, 49 received, 2% packet loss, time 
> 49523ms rtt 
> > min/avg/max/mdev = 190.089/214.855/544.880/59.052 ms
> >
> 
> That is quite a variation, over an already longish ping time. 
> you probably need to do some traffic shaping at your routers 
> to give IAX priority. If you are getting good results from 
> skype over the same link, you could try examining the TOS 
> bits in the skype packets and setting the IAX to use the same 
> TOS bits since that may be what is making the difference.
> 
> >> Any error messages ?
> > There are no error messages in the console.
> 
> Just to check, can you get decent call quality between 2 IAX 
> clients on 
> the same
> (local server)?
> 
> >
> > Regards,
> > Stojan Sljivic
> >
> 
> Hope that helps
> 
> Tim
> 
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