It's tough to say why a voice would start sounding like a robot. There are so many variables that could effect your Asterisk server.

I always go for process of elimination when I have a problem similar to this with call quality.

What I would do is install an end point on the same local network / subnet as your asterisk server (either a hard phone or a soft phone like X-Lite by Counterpath). Register the phone locally with your Asterisk server and make some calls or put an echo tester up.

If things sound good, you know your Asterisk server is working just fine, and the problems lies somewhere on your network between the Asterisk server and whatever gateway / device. If it sounds awful, and the codecs match, then it's time to start troubleshooting the server.


_____________________________

Darren Sessions
[EMAIL PROTECTED]
http://www.darrensessions.com
_____________________________





On Aug 22, 2008, at 3:14 AM, bilal ghayyad wrote:

Dear Darren;

You might be right because one day it happened with me and the situation was same like this as following:

The status that the ping result is very good for all partied (Asterisk machine, IP Phones on the Internet), and no problem in the processor utilization or RAM or hard disk space.

Previously, we changed the DSL router and it worked fine !!

But what can I do on the Asterisk level to overcome the problem?

I already enabled the jitter on the IAX and SIP, but did not resolved. And I am using the G729 codec and sometimes I use GSM.


Any advise for the robot voice with weak battery :) ?!

Regards
Bilal

--- On Thu, 8/21/08, Darren Sessions <[EMAIL PROTECTED]> wrote:

From: Darren Sessions <[EMAIL PROTECTED]>
Subject: Re: [asterisk-users] Suddenly the voice become like robot (cutting), like sick man
To: [EMAIL PROTECTED]
Date: Thursday, August 21, 2008, 9:47 PM
I doubt recompiling is going to help you unless you've
got a very
unstable system (hard drive going out or something), and
then you've
got bigger things to worry about then anyways.

You should install (if you haven't already) the
'top' program. Top
gives you a nice set of system statistics and a list of
processes.

If you're only having issues on the IP origination side
of things, I
would start checking your bandwidth and latency on your
network.

Is the originating end point on the Internet? or local?


_____________________________

Darren Sessions
[EMAIL PROTECTED]
http://www.darrensessions.com
_____________________________





On Aug 21, 2008, at 4:55 PM, bilal ghayyad wrote:

Dear Darren;

I discovered that calling from the Asterisk to the IP
Phone
Extension (like calling from mobile to digium and then
enter the IP
Phone extension, or calling from fxs to the IP Phone
extension), it
goes very good without any problem.

But calling from the same IP Phone to another IP Phone
or to any
mobile (via fxo port) or to the fxs, it cause the
problem (voice
become very very bad, like robot with weak battery or
sick man).

Another way for the problem, if I called from another
Asterisk PBX
to our Asterisk PBX (that has the problem) and the
call was via IAX,
and I was need to reach to the IP Phone, then I hear
the voice like
robot with weak battery.

So, the problem appear if the call originator was IP
and not TDM.
What could be the reason for the problem? No one did
any change, I
am sure, it suddenly become like this.

Any help?
Regards
Bilal


--- On Thu, 8/21/08, Darren Sessions
<[EMAIL PROTECTED]> wrote:

From: Darren Sessions <[EMAIL PROTECTED]>
Subject: Re: [asterisk-users] Suddenly the voice
become like robot
(cutting), like sick man
To: [EMAIL PROTECTED], "Asterisk Users
Mailing List - Non-
Commercial Discussion"
<asterisk-users@lists.digium.com>
Date: Thursday, August 21, 2008, 6:13 PM
I'd run top on the server to see if the CPU
utilization
is going
through the roof. If you use AGI, make sure there
aren't any orphaned
processes consuming resources.

If all else fails on the software side of things,
I'd
restart the
server.


_____________________________

Darren Sessions
[EMAIL PROTECTED]
http://www.darrensessions.com
_____________________________





On Aug 21, 2008, at 4:03 PM, bilal ghayyad wrote:

Hi All;

My asterisk version is 1.4.19.2 and it
contains one
digium card of 2
fxs and 2 fxo ports, it was working great for
more
than one month
without any problem.

Suddenly, any call will be done, then voice
becoming
like robot (or
sick man), it slow and cutting.

I restarted the machine, but it is the same
!!!

I checked the RAM which is 1 GB and I found a
lot of
space.

Any advise what could be the problem?
Regards
Bilal







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