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<p class=MsoNormal><font size=2 face=Arial><span lang=NO-BOK style='font-size:
10.0pt;font-family:Arial'>Hello all!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=NO-BOK style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>For several months now we’ve been experiencing a
really strange problem with sound which best can be explained as
choppy/stuttery, and with a touch of echo on top. Basically, parts of a
conversation might be choppy, but often combined with some echo as well. The
sound problem can only be heard by us, not by the other party. But this is the
strange part:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The problem only occurs periodically, and only towards one
single SIP provider. All our equipment is SIP based (we use Cisco 79XX
equipment with firmware 7.5 and 8.x), and we have no PSTN lines. Since this has
been lasting for months, I don’t know the exact time the problem occurred
at first. I recall everything as fine when I ran Asterisk 1.0.7, but through 1.0.9,
1.2.2 and 1.2.5 (HEAD) this problem persists. However, I have a hard time
believing this is caused by a bug. Why? Well, as said, we have no problems with
other providers. In addition, we have Cisco phones that communicate with
Asterisk at the office (traffic is switched between two local subnets) and also
over the internet, and all calls made between these phones are completed
without any trouble. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>So I tried doing a clean install on a fresh CentOS last
week, but with no luck – the problem is still there. I also checked if
there were load or IRQ issues, which there is not.The box runs APF firewall and
has ports 5060-5070, as well as 8000-10000 (for rtp) open tcp/udp. From the
phone information menu I can see that frame size is most likely set to 20 ms,
while the provider uses 20 or 40 ms (not sure).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I should add that this provider is among the larger ones in
Norway (IP24). Other users have reported Asterisk to work just fine with it in
the Provider’s local forum, but that is certainly not my experience. So
my question is, is there anything I might have overlooked, or is there a
particular way I can debug this issue?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>From sip.conf:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>[general]<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>port = 5060<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>bindaddr = 0.0.0.0<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>context = default<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>disallow = all<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>;allow = ulaw<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>allow = alaw<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>;allow = g729<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>allow=gsm<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>maxexpirey = 3600<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>defaultexpirey = 160<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>externip = xx.xx.xx.xx // Asterisk’s static IP<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>;externrefresh = 60<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>notifymimetype=application/simple-message-summary<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>dtmfmode= rfc2833<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>pedantic=no<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=NO-BOK style='font-size:
10.0pt;font-family:Arial'>register => 11223344:password:11223344@sip.provider.com:5060/11223344<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=NO-BOK style='font-size:
10.0pt;font-family:Arial'>//phonenumber:password:phonenumber@sip-proxy:5060/extension<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=NO-BOK style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=NO-BOK style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>[11223344]<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>context= full-access<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>type=friend<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>secret=apassword<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>fromuser=11223344<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>username=11223344<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>host=sip.provider.com<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>fromdomain=sip.provider.com<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>restrictid=yes<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>canreinvite=no<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>insecure=very<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>deny=0.0.0.0/0.0.0.0<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=NO-BOK style='font-size:
10.0pt;font-family:Arial'>permit=123.123.123.0/255.255.255.0 (provider’s
subnet)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=NO-BOK style='font-size:
10.0pt;font-family:Arial'>nat=no<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=NO-BOK style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks for all help!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Bjorn<o:p></o:p></span></font></p>
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<BR>
<P><FONT SIZE=2>--<BR>
No virus found in this outgoing message.<BR>
Checked by AVG Free Edition.<BR>
Version: 7.1.385 / Virus Database: 268.2.6/287 - Release Date: 21.03.2006<BR>
</FONT> </P>