<div dir="rtl"><div dir="ltr">It might be related to JIRA 3274 which I've (re)opened recently.</div><div dir="ltr">When Freeswitch receives a RE-Invite with T.38 parameters inside it responds with "Trying" but no "OK" following it. The originator then times out and disconnects the call.</div>
<div dir="ltr"> </div><div dir="ltr"> Regards, __Yehavi:<br><br></div><div dir="ltr" class="gmail_quote"><div>2011/5/24 Rob Morin <span dir="ltr"><<a href="mailto:rmorin@blie-ent.com">rmorin@blie-ent.com</a>></span></div>
<blockquote style="margin: 0px 0px 0px 0.8ex; padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;" class="gmail_quote"><div><div lang="EN-US" vlink="purple" link="blue">
<div><p class="MsoNormal"><span style="color: rgb(31, 73, 125); font-size: 11pt;">David,</span></p><p class="MsoNormal"><span style="color: rgb(31, 73, 125); font-size: 11pt;"> </span></p><p class="MsoNormal"><span style="color: rgb(31, 73, 125); font-size: 11pt;">It isn’t the ATA. I’ve tried both the Grandstream HandyTone 502 and Cisco/Linksys SPA 2102. Same story in both cases.</span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125); font-size: 11pt;"> </span></p><p class="MsoNormal"><span style="color: rgb(31, 73, 125); font-size: 11pt;">I had my carrier help me troubleshoot and we can see the SIP request from the carrier come in. When T.38 is enabled, it is forwarded to the A leg, but the response from the A leg isn’t forwarded back to the B leg. I can produce traces that show this. </span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125); font-size: 11pt;"> </span></p><p class="MsoNormal"><span style="color: rgb(31, 73, 125); font-size: 11pt;">When T.38 isn’t enabled, the B leg is sending a T.38 reinvite. FS doesn’t respond or forward it. So the connection dies. I have every reason to believe that I’d be able to send the fax if FS would respond with a 488 indicating T.38 is not acceptable. But instead, all I get is silence. Again, I can produce traces that demonstrate this.</span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125); font-size: 11pt;"> </span></p><p class="MsoNormal"><span style="color: rgb(31, 73, 125); font-size: 11pt;">There’s another similar email trail out there, <a href="http://freeswitch-users.2379917.n2.nabble.com/T-38-via-UPDATE-request-td3821994.html" target="_blank">http://freeswitch-users.2379917.n2.nabble.com/T-38-via-UPDATE-request-td3821994.html</a>, but I’m not certain that they’re related.</span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125); font-size: 11pt;"> </span></p><p class="MsoNormal"><span style="color: rgb(31, 73, 125); font-size: 11pt;">Thank you for your help!<br>Rob </span></p><p class="MsoNormal">
<span style="color: rgb(31, 73, 125); font-size: 11pt;"> </span></p><div><div style="border-width: 1pt medium medium; border-style: solid none none; border-color: rgb(181, 196, 223) currentColor currentColor; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;"> David Ponzone [mailto:<a href="mailto:david.ponzone@ipeva.fr" target="_blank">david.ponzone@ipeva.fr</a>] <br><b>Sent:</b> Monday, May 23, 2011 6:11 PM<br>
<b>To:</b> FreeSWITCH Users Help<br><b>Subject:</b> Re: [Freeswitch-users] Faxing problems if B leg offers T.38</span></p></div></div><div><div></div><div class="h5"><p class="MsoNormal"> </p><p class="MsoNormal">Rob,</p>
<div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">perhaps you should not consider T38 is 100% interoperable.</p></div><div><p class="MsoNormal">You may tell us what ATA is that, because some of them are nice piece of junk.</p>
</div><div><p class="MsoNormal"> </p><div><div><div><p class="MsoNormal"><span style="font-size: 10.5pt;">David Ponzone </span><span><span style="font-size: 9pt;">Direction Technique</span></span><span style="color: black; font-size: 10.5pt;"></span></p>
</div><div><p class="MsoNormal"><span><span style="font-size: 10pt;">email: <a href="mailto:david.ponzone@ipeva.fr" target="_blank">david.ponzone@ipeva.fr</a></span></span><span style="color: black; font-size: 10.5pt;"></span></p>
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<br></span></p></div><p class="MsoNormal"> </p><div><div><p class="MsoNormal">Le 23/05/2011 à 20:51, Rob Morin a écrit :</p></div><p class="MsoNormal"><br><br></p><div><div><p class="MsoNormal"><span style="font-size: 11pt;">I’m having problems faxing if the B leg offers T.38. Several scenarios, but always the same result.</span></p>
</div><div><p class="MsoNormal"><span style="font-size: 11pt;"> </span></p></div><div><p class="MsoNormal"><span style="font-size: 11pt;">First, the architecture</span></p></div><div><p class="MsoNormal"><span style="font-size: 11pt;"> </span></p>
</div><div><p class="MsoNormal"><span style="font-size: 11pt;">FAX<span> </span></span><span style="font-family: Wingdings; font-size: 11pt;">à</span><span><span style="font-size: 11pt;"> </span></span><span style="font-size: 11pt;">ATA (T.38 optional)<span> </span></span><span style="font-family: Wingdings; font-size: 11pt;">à</span><span><span style="font-size: 11pt;"> </span></span><span style="font-size: 11pt;">FS<span> </span></span><span style="font-family: Wingdings; font-size: 11pt;">à</span><span><span style="font-size: 11pt;"> </span></span><span style="font-size: 11pt;">Carrier <span> </span></span><span style="font-family: Wingdings; font-size: 11pt;">à</span><span><span style="font-size: 11pt;"> </span></span><span style="font-size: 11pt;">Destination (Possibly another carrier (PSTN) and the fax machine)</span></p>
</div><div><p class="MsoNormal"><span style="font-size: 11pt;"> </span></p></div><div><p class="MsoNormal"><span style="font-size: 11pt;">On my ATA, T.38 is enabled (Auto Detect).</span></p></div><div><p class="MsoNormal">
<span style="font-size: 11pt;"> </span></p></div><div><p class="MsoNormal"><span style="font-size: 11pt;">If the destination supports T.38, the Carrier will offer it to Freeswitch. If the Destination doesn’t support T.38, the B leg doesn’t offer it and the faxes go through.</span></p>
</div><div><p class="MsoNormal"><span style="font-size: 11pt;"> </span></p></div><div><p class="MsoNormal"><span style="font-size: 11pt;">I’ve set Freeswitch as:</span></p></div><div><p class="MsoNormal"><span style="font-size: 11pt;"> <action application="set" data="fax_enable_t38=true"/></span></p>
</div><div><p class="MsoNormal"><span style="font-size: 11pt;"> <action application="export" data="t38_passthru=true"/> </span></p></div><div><p class="MsoNormal"><span style="font-size: 11pt;">When that’s the case, and the B leg offers T.38, Freeswitch passes through the offer and the ATA responds, 3 times. But the response never gets sent to the B leg, so it terminates the call after about 30 seconds.</span></p>
</div><div><p class="MsoNormal"><span style="font-size: 11pt;"> </span></p></div><div><p class="MsoNormal"><span style="font-size: 11pt;">When I set Freeswitch as:</span></p></div><div><p class="MsoNormal"><span style="font-size: 11pt;"> <action application="set" data="fax_enable_t38=false"/></span></p>
</div><div><p class="MsoNormal"><span style="font-size: 11pt;">The B leg still offers T.38 if its other side is capable. Freeswitch doesn’t pass the offer through and the B leg terminates the call after about 30 seconds.</span></p>
</div><div><p class="MsoNormal"><span style="font-size: 11pt;"> </span></p></div><div><p class="MsoNormal"><span style="font-size: 11pt;">I’m running on a recent git ( FreeSWITCH Version 1.0.head (git-86d757d 2011-05-17 22-51-47 -0500) ).</span></p>
</div><div><p class="MsoNormal"><span style="font-size: 11pt;"> </span></p></div><div><p class="MsoNormal"><span style="font-size: 11pt;">I’ve had no success attempting to configure FS as a gateway. Frankly, T.38 “passthrough” has had the most success, mostly when the other ends aren’t T.38 capable and it stays in G711u.</span></p>
</div><div><p class="MsoNormal"><span style="font-size: 11pt;"> </span></p></div><div><p class="MsoNormal"><span style="font-size: 11pt;">Is there something else I need to do to enable T.38 in passthrough mode? </span></p>
</div><div><p class="MsoNormal"><span style="font-size: 11pt;"> </span></p></div><div><p class="MsoNormal"><span style="font-size: 11pt;">Thank you,<br>Rob Morin</span></p></div><div><p class="MsoNormal"><span style="font-size: 11pt;"> </span></p>
</div><div><p class="MsoNormal"><span style="font-size: 11pt;">PS – I can provide tcpdumps of this, or whatever else is necessary.</span></p></div><div><p class="MsoNormal"><span style="font-size: 11pt;"> </span></p></div>
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