<table cellspacing="0" cellpadding="0" border="0"><tr><td valign="top"><p dir="ltr"><font size ="2"><font size ="2">Hello</font></font><br></p>
<p dir="ltr"><font size ="2"><font size ="2">Actually it will be fine If I can send sip 488 not acceptable here to the re invite of t38 .</font></font></p>
<p dir="ltr"><font size ="2"><font size ="2">But Asterisk is sending sip 200 ok with voice codecs in SDP.</font></font></p>
<p dir="ltr"><font size ="2"><font size ="2">So if i was able to send sip 488 . The fax will contunie with g711 </font></font></p>
<p dir="ltr"><font size ="2"><font size ="2">Setting faxopt(gateway)=yes and t38pt_udptl = yes,redundancy,maxdatagram=400 didnt work. </font></font><br>
<font size ="2"><font size ="2">By setting these asterisk should send sip 200 with SDP T38 but it is still sending speech codec(g11u,etc..) in SIP 200 sdp.</font></font></p>
<p dir="ltr"><font size ="2"><font size ="2">Also disabling t38 with t38pt_udptl=no didnt change anything. </font></font><br><br></p>
<p dir="ltr"><font size ="2"><font size ="2">Regards</font></font><br>
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<span style="font-weight:bold">From:</span>
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Kaloyan Kovachev <kkovachev@varna.net>; <br>
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<span style="font-weight:bold">To:</span>
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Huseyin Kaya <huseyinkaya@yahoo.com>; <asterisk-ss7@lists.digium.com>; <br>
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<span style="font-weight:bold">Subject:</span>
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Re: [asterisk-ss7] T38 fax issue <br>
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<span style="font-weight:bold">Sent:</span>
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Fri, Aug 22, 2014 1:52:44 PM <br>
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<td valign="top">Hi,<br clear="none">in addition to FAXOPT(gateway) you may try to request transmission <br clear="none">medium from telco - see SS7_TMR or SS7_TMR_NUM, as it should be set on <br clear="none">the outgoing (dahdi) channel you need to set it on the SIP channel with <br clear="none">underscore (_SS7_TMR)<br clear="none"><br clear="none">The possible options are defined in libss7.h and SS7_TMR_3K1_AUDIO (or 3 <br clear="none">as num) works fine here. If you can detect the fax calls you may request <br clear="none">64K_UNRESTRICTED data for them<br clear="none"><div class="yqt5418234306" id="yqtfd89673"><br clear="none">On 2014-08-22 15:47, Huseyin Kaya wrote:<br clear="none"><br clear="none">> Hello<br clear="none">> <br clear="none">> I am using Sangoma A104DE with libss7 on Asterisk 11.5.0 and <br clear="none">> terminating calls to telco with ss7 . We are using patched version of <br
clear="none">> Libss7 that have timers <br clear="none">> functionality.(<a shape="rect" href="https://issues.asterisk.org/jira/browse/SS7-27" target="_blank">https://issues.asterisk.org/jira/browse/SS7-27</a>)<br clear="none">> <br clear="none">> The server is on production for the last 6 months and everything was <br clear="none">> fine<br clear="none">> <br clear="none">> My interconnection with telco is only one way. From sip to ss7 .<br clear="none">> <br clear="none">> Everything is fine except one thing.<br clear="none">> <br clear="none">> One of my customers asked for t38 faxing. then i found myself in <br clear="none">> trouble.<br clear="none">> <br clear="none">> I get several sip traces and found the problem at the end .When i <br clear="none">> receive an invite T38 , asterisk is sending 200 OK message but in SDP <br clear="none">> it is sending g711u,g711a,g729 as codecs. So after this point
<br clear="none">> everything is messed up.<br clear="none">> <br clear="none">> I tried to set t38pt_udptl=no in sip.conf , but still asterisk is <br clear="none">> sending sip 200 ok with sdp g711...<br clear="none">> <br clear="none">> ı tried to set t38pt_udptl = yes,redundancy,maxdatagram=400 and <br clear="none">> setvar=FAXOPT(gateway)=yes,20 in sip.conf but still i couldn't manage <br clear="none">> to receive fax<br clear="none">> <br clear="none">> So basically what i need to send fax from sip to telco but could not <br clear="none">> manage to do till now.<br clear="none">> <br clear="none">> Everything except fax is working like a charm.<br clear="none">> <br clear="none">> Is anyone succeed to handle fax with libss7.<br clear="none">> <br clear="none">> I will be glad if an expert can show me a way to achive this.<br clear="none">> <br clear="none">> Best Regards<br
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