<p dir="ltr">Hi Abel</p>
<p dir="ltr">Unless you have Guaranteed 0% packet loss (like a LAN speed connection or direct ptp link). Then using pass through is going to give you constant hassles in my experience. </p>
<p dir="ltr">Most likely what is causing the issue is that your server is just creating a greater degree of packet loss and jitter. Faxes really don't deal with either very well. </p>
<p dir="ltr">Kind regards<br>
Matthew</p>
<div class="gmail_quote">On 15 Jan 2014 7:17 PM, "Abel Alejandro" <<a href="mailto:aalejandro@alliedtechnologygrouppr.com">aalejandro@alliedtechnologygrouppr.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Hello,<div><br></div><div>I have some fax issues and I am not sure how to find the problem.</div><div><br></div><div>My test topology looks like this:</div><div><br></div><div>ATA -> Sipwise -> My carrier -> PSTN</div>
<div><br></div><div>In this setup fax calls usually do not work, they work like 2 out of 12.</div><div><br></div><div>However if I request my carrier to provide an account for the ATA and change the topology to:</div><div>
<br></div><div>ATA -> My carrier -> PSTN</div><div><br></div><div>Then calls work without issue.</div><div><br></div><div>My sipwise is on a HP server without virtualization, and the cpu idle does not go below 90%. I do not have more than 10 concurrent calls so there is no traffic issue.</div>
<div><br></div><div>Codec is g711, pass thru is enabled (not using t.38).</div><div><br></div><div>Running tcpdump on the sipserver and analyzing the capture with wireshark only shows about 0.01% pkt loss due to jitter. However the tcpdumps always have packet drops due to kernel, not sure if this is normal.</div>
<div><br></div><div>Any tips?<br clear="all"><div><br></div>-- <br><span style="color:rgb(102,102,102);font-size:13px;font-family:arial,sans-serif"><i><font size="4" face="'trebuchet ms', sans-serif">Abel Alejandro</font></i></span><div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">
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