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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>in addition to FAXOPT(gateway) you may try to request transmission <BR>medium from telco - see SS7_TMR or SS7_TMR_NUM, as it should be set on <BR>the outgoing (dahdi) channel you need to set it on the SIP channel with <BR>underscore (_SS7_TMR)<BR><BR>The possible options are defined in libss7.h and SS7_TMR_3K1_AUDIO (or 3 <BR>as num) works fine here. If you can detect the fax calls you may request <BR>64K_UNRESTRICTED data for them<BR><BR>On 2014-08-22 15:47, Huseyin Kaya wrote:<BR><BR>> Hello<BR>> <BR>> I am using Sangoma A104DE with libss7 on Asterisk 11.5.0 and <BR>> terminating calls to telco with ss7 . We are using patched version of <BR>> Libss7 that have timers <BR>> functionality.(<a href="https://issues.asterisk.org/jira/browse/SS7-27" target=_blank >https://issues.asterisk.org/jira/browse/SS7-27</a>)<BR>> <BR>> The server is on production for the last 6
months and everything was <BR>> fine<BR>> <BR>> My interconnection with telco is only one way. From sip to ss7 .<BR>> <BR>> Everything is fine except one thing.<BR>> <BR>> One of my customers asked for t38 faxing. then i found myself in <BR>> trouble.<BR>> <BR>> I get several sip traces and found the problem at the end .When i <BR>> receive an invite T38 , asterisk is sending 200 OK message but in SDP <BR>> it is sending g711u,g711a,g729 as codecs. So after this point <BR>> everything is messed up.<BR>> <BR>> I tried to set t38pt_udptl=no in sip.conf , but still asterisk is <BR>> sending sip 200 ok with sdp g711...<BR>> <BR>> ı tried to set t38pt_udptl = yes,redundancy,maxdatagram=400 and <BR>> setvar=FAXOPT(gateway)=yes,20 in sip.conf but still i couldn't manage <BR>> to receive fax<BR>> <BR>> So basically what i need to send fax from sip to telco but could not <BR>> manage to do
till now.<BR>> <BR>> Everything except fax is working like a charm.<BR>> <BR>> Is anyone succeed to handle fax with libss7.<BR>> <BR>> I will be glad if an expert can show me a way to achive this.<BR>> <BR>> Best Regards<BR><BR>-- <BR>_____________________________________________________________________<BR>-- Bandwidth and Colocation Provided by <a href="http://www.api-digital.com " target=_blank >http://www.api-digital.com </a>--<BR><BR>asterisk-ss7 mailing list<BR>To UNSUBSCRIBE or update options visit:<BR> <a href="http://lists.digium.com/mailman/listinfo/asterisk-ss7" target=_blank >http://lists.digium.com/mailman/listinfo/asterisk-ss7</a></td>
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