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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Well I am using GSM as my main codec which
seems to be very nice…<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I would also suggest you looking at the
load of you CPU… I know that asterisk is very processor hungry…<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>You can also change some settings in the
zapta and zaptel config.. to reduce echo and interference on the line..<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] <b><span style='font-weight:
bold'>On Behalf Of </span></b>sdgesa gaeharth<br>
<b><span style='font-weight:bold'>Sent:</span></b> 05 October 2006 14:38<br>
<b><span style='font-weight:bold'>To:</span></b>
asterisk-users@lists.digium.com<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [asterisk-users]
Extremely choppy sound on some of ourPOTSnetwork calls; goes away with mute</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Below is the text of my
original post. I am not sure what Codec we are using. The "Codec
Preferences" phone setting shows, in order of preference, G.711u, G.711A,
G.729AB<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>We are running asterisk-1.2.4 with zaptel-1.2.7 on Fedora Core
4-2.6.14-1.1656_FC4smp. It is installed on a Dell PE 2500 with
2x900 MHz processors and 1 Gb RAM and 1 SCSI Disk. The server has a Digium
TDM400P card which is connected to 4 POTS lines. The server is also
connected to a 100MB switched LAN where we have about 20 Polycom 501 phones
with the latest firmware updates. Nothing else runs on the server except an ftp
daemon which is never used except when a phone reboots.<br>
<br>
For about 20% of the calls to the outside world, the voice on the other end of
an outside line is incredibly choppy. Enough to where we have to
hang up and call on a cell phone. It is always the same numbers that are
choppy. The funny thing is, if I press mute while talking on a choppy
call, the choppiness goes away completely.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I have tried: turning off ACPI, turning off APCI, moving the card to
another PCI slot, changing the RX/TX gains. There are no shared IRQs. I have
tested the lines by unplugging them from the asterisk server and plugging them
directly into an analogue phone. Using "cat /proc/interrupts; sleep 10 ;
cat /proc/interrupts" I see that there are about 1,000 interrupts per
seconds between the card and the CPU.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I do not think it is a network congestion problem as intra-office
communications as well as voicemail retrieval are always perfect. The Voip does
not go over any routers, just a max of 2 switches with a 1GB trunk. This
happens even off-hours when the network isn’t being used at all.<o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>There are never more than 2 people on the phone at the same time and it
is definitely not an over-utilized processor.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>I have trying to figure
this out for 2 months on and off with no success any help is appreciated.<br>
<br>
<o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Thanks<br>
<br>
<b><i><span style='font-weight:bold;font-style:italic'>Andrew Shelton
<andrew.shelton@stemnetworks.co.uk></span></i></b> wrote:<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><u1:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="country-region"><u1:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"></u1:SmartTagType></u1:SmartTagType>What
codec are you using?<u1:p></u1:p></span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>How many phone? What load is the server
under?<u1:p></u1:p></span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><u1:p> </u1:p></span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] <b><span style='font-weight:
bold'>On Behalf Of </span></b>sdgesa gaeharth<br>
<b><span style='font-weight:bold'>Sent:</span></b> 05 October 2006 13:22<br>
<b><span style='font-weight:bold'>To:</span></b>
asterisk-users@lists.digium.com<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [asterisk-users]
Extremely choppy sound on some of our POTSnetwork calls; goes away with mute</span></font><o:p></o:p></p>
<u1:p></u1:p></div>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><u1:p> </u1:p><o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>1)Can anyone tell me how to do this on a Polycom 501?<br>
<br>
2)Can you explain why you think this any why it ony happens on some calls?<br>
<br>
Thanks<br>
<br>
<b><i><span style='font-weight:bold;font-style:italic'>Andres
<andres@telesip.net></span></i></b> wrote:<u1:p></u1:p><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
><br>
><br>
> For about 20% of the calls to the outside world, the voice on the <br>
> other end of an outside line is incredibly choppy. Enough to where <br>
> we have to hang up and call on a cell phone. It is always the same <br>
> numbers that are choppy. The funny thing is, if I press mute while <br>
> talking on a choppy call, the choppiness goes away completely.<br>
><br>
> <br>
><br>
Maybe you have silence suppression enabled on your phones. Try to <br>
disable it and see if it helps.<br>
<br>
>------------------------------------------------------------------------<br>
><br>
> <br>
><br>
<br>
<br>
-- <br>
Andres<br>
Technical Support<br>
http://www.telesip.net<br>
<br>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
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(and 30+ countries) for 2¢/min or less.<u1:p></u1:p><o:p></o:p></span></font></p>
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<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
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