[Asterisk-Users] IAX choppy sound

[Stojan Sljivic - GDS]

Hi,

I have downloaded an IAX softphone and tested the connection locally.
The sound is perfect.

How should I troubleshoot this IAX connection between these two Asterisk
servers?
Is there some tool that can help in determining the cause of the choppy
sound?

Regards,
Stojan Sljivic 



> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com 
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of 
> Stojan Sljivic - GDS
> Sent: Wednesday, March 15, 2006 13:14
> To: 'Asterisk Users Mailing List - Non-Commercial Discussion'
> Subject: RE: [Asterisk-Users] IAX choppy sound
> 
> 
> 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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