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<DIV dir=ltr align=left><SPAN class=440053705-12122007><FONT face=Arial
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<P class=MsoNormal align=left><STRONG><SPAN
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<FONT face=Tahoma size=2><B>From:</B> Paul Hales
[mailto:phales@asteriskit.com.au] <BR><B>Sent:</B> Wednesday, 12 December 2007
4:10 PM<BR><B>To:</B> Daniel Cole<BR><B>Subject:</B> Re: [asterisk-users] Call
Quality Issues With 2 Trixbox's - Router Issue?<BR></FONT><BR></DIV>
<DIV></DIV><BR>What codec are you using?<BR><BR>PaulH<BR><BR><BR>On Wed,
2007-12-12 at 13:00 +1100, Daniel Cole wrote:
<BLOCKQUOTE TYPE="CITE"><FONT size=2><FONT color=#000000>Hello
Everyone,</FONT></FONT><BR><BR><FONT size=2><FONT color=#000000>We have
recently installed a pair of Trixbox servers in for a client of our. They have
two locations, with one server each. The servers terminate 3 standard POTS
lines into a Sangoma A200D card. The servers are IBM x3250 1RU servers (1GB
Ram, Raid 1 160GB HDD, Dual Core Xenon Processors). We are using Trixbox 2.2,
and G729 all around.</FONT></FONT><BR><BR><FONT size=2><FONT
color=#000000>Each site has two (2) 512k/512k ADSL connections terminating
into a Cisco 877W router (using an additional 'dumb' modem in a separate VLAN
for the extra dsl connection). Using policy based routing, all Voice Data goes
over one DSL connection (the one that terminates directly into the router),
and all other traffic (e.g. Web and VPN) goes out the second connection (the
bridged dumb dsl modem).</FONT></FONT><BR><BR><FONT size=2><FONT
color=#000000>We are also the ISP for this client, and as thus we have full
monitoring of our Layer 2 and Layer 3 networks. From our analysis, it doesn't
appear that there is any issue in these networks. We have other customers
using the VoIP service, who have not complained of these
issues.</FONT></FONT><BR><BR><FONT size=2><FONT color=#000000>Now for the Fun
part!</FONT></FONT><BR><FONT size=2><FONT color=#000000>The client is
complaining of issues with inter-site calls. They are reporting issues with
crackly and broken speech, and horrible jitter (or packet loss). This presents
a huge issues, because they have one receptionist answering all calls for both
sites. So if a call comes in from the other site, it automatically an
inter-site call, and the quality falls out of it. If the call is then
transfered back to the originating site, the audio 'bounces' between the two
sites, which add to the call quality degradation.</FONT></FONT><BR><BR><FONT
size=2><FONT color=#000000>We have been monitoring the router while these
incidents have been reported, and it does not appear to be a bandwidth issue.
The DSL tail used for Voice gets to no more then 120k in each direction (we
have tested the links, and can pull data at 53k/s between sites). CPU usage
floats at around 20-25% under load. The router has only shows major packet
loss (that we can tell) when REALLY pushing it in testing (e.g. 10+ calls
between sites).</FONT></FONT><BR><FONT size=2><FONT color=#000000>We have
enabled the SIP jitter buffer, as well as the IAX jitter buffer, which
appeared to make a huge difference, but the issue is still
ongoing.</FONT></FONT><BR><BR><FONT size=2><FONT color=#000000>These issues
have also been reported with some outbound VoIP calls. Internal calls, and
calls directly in or out of the Sangoma card are clear, with no issues
reported.</FONT></FONT><BR><BR><FONT size=2><FONT color=#000000>Does anyone
have any thoughts on what could be causing these issues? We have been racking
our brains here, and have tried everything that we can think of. These system
is a million times better then what is what when it was first installed, but
it is still not where it should be in terms of
quality.</FONT></FONT><BR><BR><FONT size=2><FONT color=#000000>Any
thoughts/ideas are most welcome.</FONT></FONT><BR><BR><FONT size=2><FONT
color=#000000>Thank you</FONT></FONT><BR><BR><BR></BLOCKQUOTE>
<BLOCKQUOTE TYPE="CITE"><FONT color=#000000></FONT> </BLOCKQUOTE>
<BLOCKQUOTE TYPE="CITE"><B><FONT color=#666666>Daniel Cole
(CCNA) </FONT></B><BR><BR><BR><BR></BLOCKQUOTE>
<BLOCKQUOTE TYPE="CITE"><BR><FONT color=#000000> </FONT><FONT
color=#00ff00>P</FONT><FONT color=#000080> </FONT><FONT color=#00ff00>Please
consider the environment before you print this e-mail or any
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<BLOCKQUOTE TYPE="CITE"><FONT color=#000000></FONT> </BLOCKQUOTE>
<BLOCKQUOTE TYPE="CITE"><PRE><FONT color=#000000>_______________________________________________</FONT>
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