VoIP Mailing List Archives

[alex at alexkinch.com]

Hi,

Just setup an IAX trunk from FS to a SIP provider who runs Asterisk,
but getting a truckload of distortion when I make calls. The
iax.conf.xml settings are as per the default.

I've turned debugging on but just wondered where would be a good place
to start trying to track down the problem? The codec appears to be
PCMU/8000. Any suggestions welcome - this is the first time I've used
IAX on FS, and have never had audio distortion issues with SIP trunks
etc.

Thanks,
Alex

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[brian at freeswitch.org]

What kind of load and how many channels?

/b

On Sep 26, 2008, at 1:13 PM, Alex Kinch wrote:

[alex at alexkinch.com]

No load as no other calls. Just one channel active. Sip to the same provider has worked previously.

I recorded a test call on xlite if you want a copy of the wav?

Cheers,
Alex
-- I sent this from my 3 mobile --

-original message-
Subject: Re: [Freeswitch-users] IAX outbound trunk and distortion
From: "Brian West" <brian@freeswitch.org>
Date: 26/09/2008 9:30 pm

What kind of load and how many channels?

/b

On Sep 26, 2008, at 1:13 PM, Alex Kinch wrote:

[brian at freeswitch.org]

if the recorded wav exhibits the issue sure.

/b

On Sep 26, 2008, at 3:39 PM, kinchyuk@googlemail.com wrote:

[alex at alexkinch.com]

Sure, will send it over when I get back. Also appear to have a dialplan issue where a call on sip matches but an iax trunk doesn't, but I'll put that on a separate email.

Alex
-- I sent this from my 3 mobile --

-original message-
Subject: Re: [Freeswitch-users] IAX outbound trunk and distortion
From: "Brian West" <brian@freeswitch.org>
Date: 26/09/2008 10:06 pm

if the recorded wav exhibits the issue sure.

/b

On Sep 26, 2008, at 3:39 PM, kinchyuk@googlemail.com wrote:

[brian at freeswitch.org]

I'm gonna guess you're using the alaw codec and the far end is asterisk?

/b

On Sep 27, 2008, at 4:17 AM, Alex Kinch wrote:

[alex at alexkinch.com]

Far end is Asterisk, yep - codec debug line below:

2008-09-27 10:28:24 [INFO] mod_iax.c:399 iax_set_codec() Activate
Codec PCMU/8000 20 ms

Alex


On 27 Sep 2008, at 10:20, Brian West wrote:

[brian at freeswitch.org]

Can you tell me what part of the world the provider is in?

/b

On Sep 27, 2008, at 4:30 AM, Alex Kinch wrote:

[alex at alexkinch.com]

Here in Blighty.. (England to everyone else!)


On 27 Sep 2008, at 10:32, Brian West wrote:

[brian at freeswitch.org]

Try changing the codec to alaw and see if it goes away, If so then I
suspect the direct ulaw/alaw transcoder in Asterisk is broken.

/b

On Sep 27, 2008, at 4:35 AM, Alex Kinch wrote:

[dave at 3c.co.uk]

Hi Alex,

That makes two of us in Blighty at least.. it sounds most likely that
something's
not converting properly from u-law to A-law somewhere. You might want
to
force A-law - set codec-prefs to PCMA (and nothing else) in iax.conf.xml

Cheers --

Dave

[alex at alexkinch.com]

Yep, that did the trick. Thanks Brian (and David too for putting in a
way my Saturday hangover brain could understand!)

Alex

On 27 Sep 2008, at 10:41, Brian West wrote:

[brian at freeswitch.org]

Looks like the alaw codec in Asterisk still uses the wrong table.
Guess I should do a bug report on that to them. Can someone else
confirm they see the same problem with the latest Asterisk versions?

/b

On Sep 27, 2008, at 4:51 AM, Alex Kinch wrote:

[alex at alexkinch.com]

Incidentally I fixed the dialplan problem with incoming calls on IAX,
I had the entry on public.xml and not default.xml so it didn't match
on the call.

Alex

On 26 Sep 2008, at 22:10, kinchyuk@googlemail.com wrote: