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See <a class="moz-txt-link-freetext" href="https://wiki.asterisk.org/wiki/display/AST/T.38+Fax+Gateway">https://wiki.asterisk.org/wiki/display/AST/T.38+Fax+Gateway</a><br>
<br>
Particularly the line: <br>
<pre>exten => 1,n,Set(FAXOPT(gateway)=yes)
which you need on the SIP side of the DAHDI-SIP bridge
</pre>
<div class="moz-cite-prefix">On 2014/08/26 08:01 AM, Huseyin Kaya
wrote:<br>
</div>
<blockquote
cite="mid:1409032867.42096.YahooMailNeo@web122603.mail.ne1.yahoo.com"
type="cite">
<div style="color:#000; background-color:#fff;
font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial,
Lucida Grande, sans-serif;font-size:10pt">
<div class="" style=""><span class="" style="">Hello</span></div>
<div style="color: rgb(0, 0, 0); font-size: 13px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; font-style: normal; background-color:
transparent;" class=""><span class="" style=""><br class=""
style="">
</span></div>
<div style="color: rgb(0, 0, 0); font-size: 13px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; font-style: normal; background-color:
transparent;" class=""><span class="" style="">Does anyone has
a working libb7 server that able to handle T38 faxing.</span></div>
<div style="color: rgb(0, 0, 0); font-size: 13px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; font-style: normal; background-color:
transparent;" class=""><span class="" style=""><br class=""
style="">
</span></div>
<div style="color: rgb(0, 0, 0); font-size: 13px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; font-style: normal; background-color:
transparent;" class=""><span class="" style="">I am working on
this for the last 10 days. But still no solution. </span></div>
<div style="color: rgb(0, 0, 0); font-size: 13px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; font-style: normal; background-color:
transparent;" class=""><span class="" style=""><br class=""
style="">
</span></div>
<div style="color: rgb(0, 0, 0); font-size: 13px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; font-style: normal; background-color:
transparent;" class=""><span class="" style="">I am receiving
the call from sip and sending to telco with ss7. </span></div>
<div style="color: rgb(0, 0, 0); font-size: 13px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; font-style: normal; background-color:
transparent;" class=""><span class="" style=""><br class=""
style="">
</span></div>
<div style="color: rgb(0, 0, 0); font-size: 13px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; font-style: normal; background-color:
transparent;" class=""><span class="" style="">At the
beginning of the call everything is fine ( i mean codec
negotiation) . Then the remote sip side detects the fax tone
that remote end sends and </span><span
style="background-color: transparent;">Then the sip remote
side sends the t38 invite and asterisk sends SIP 200 OK
message with G711 and G729 codec in SDP.</span></div>
<div style="color: rgb(0, 0, 0); font-size: 13px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; font-style: normal; background-color:
transparent;" class=""><span style="background-color:
transparent;"><br>
</span></div>
<div style="color: rgb(0, 0, 0); font-size: 13px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; font-style: normal; background-color:
transparent;" class=""><span style="background-color:
transparent;">My customer is saying that if i am sending SIP
200 OK to his T38 invite .in SDP of SIP 200 OK there should
be only T38.</span></div>
<div style="color: rgb(0, 0, 0); font-size: 13px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; font-style: normal; background-color:
transparent;" class=""><span style="background-color:
transparent;"> </span></div>
<div style="color: rgb(0, 0, 0); font-size: 13px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; font-style: normal; background-color:
transparent;" class=""><span class="" style=""><br class=""
style="">
</span></div>
<div class="" style=""><span style="font-size: 13px;" class="">Also
disabling t38 with t38pt_udptl=no didnt change anything.
Still asterisk is sending </span><span style="font-size:
10pt;" class="">SIP 200 OK message with G711 and G729 codec
in SDP as reply to T38 invite.</span></div>
<div class="" style="color: rgb(0, 0, 0); font-size: 10pt;
font-family: HelveticaNeue, 'Helvetica Neue', Helvetica,
Arial, 'Lucida Grande', sans-serif; font-style: normal;
background-color: transparent;"><span style="font-size: 10pt;"
class=""><br>
</span></div>
<div class="" style="color: rgb(0, 0, 0); font-size: 13px;
font-family: HelveticaNeue, 'Helvetica Neue', Helvetica,
Arial, 'Lucida Grande', sans-serif; font-style: normal;
background-color: transparent;"><span style="font-size: 10pt;"
class=""><br>
</span></div>
<div class="" style="color: rgb(0, 0, 0); font-size: 13px;
font-family: HelveticaNeue, 'Helvetica Neue', Helvetica,
Arial, 'Lucida Grande', sans-serif; font-style: normal;
background-color: transparent;"><span style="font-size: 10pt;"
class="">I will be glad if current libss7 users can advice
me a way to find a solution on this issue</span></div>
<div class="" style="color: rgb(0, 0, 0); font-size: 10pt;
font-family: HelveticaNeue, 'Helvetica Neue', Helvetica,
Arial, 'Lucida Grande', sans-serif; font-style: normal;
background-color: transparent;"><span style="font-size: 10pt;"
class=""><br>
</span></div>
<div class="" style="color: rgb(0, 0, 0); font-size: 13px;
font-family: HelveticaNeue, 'Helvetica Neue', Helvetica,
Arial, 'Lucida Grande', sans-serif; font-style: normal;
background-color: transparent;"><span style="font-size: 10pt;"
class="">Regards</span></div>
<div class="" style="color: rgb(0, 0, 0); font-size: 10pt;
font-family: HelveticaNeue, 'Helvetica Neue', Helvetica,
Arial, 'Lucida Grande', sans-serif; font-style: normal;
background-color: transparent;"><br>
</div>
<div class="" style="color: rgb(0, 0, 0); font-size: 13px;
font-family: HelveticaNeue, 'Helvetica Neue', Helvetica,
Arial, 'Lucida Grande', sans-serif; font-style: normal;
background-color: transparent;"> </div>
<div style="font-family: HelveticaNeue, Helvetica Neue,
Helvetica, Arial, Lucida Grande, sans-serif; font-size: 10pt;"
class="">
<div style="font-family: HelveticaNeue, Helvetica Neue,
Helvetica, Arial, Lucida Grande, sans-serif; font-size:
12pt;" class="">
<div dir="ltr" class="" style="">
<hr class="" style="" size="1"> <font class="" style=""
size="2" face="Arial"> <b class="" style=""><span
style="font-weight:bold;" class="">From:</span></b>
Huseyin Kaya <a class="moz-txt-link-rfc2396E" href="mailto:huseyinkaya@yahoo.com"><huseyinkaya@yahoo.com></a><br class=""
style="">
<b class="" style=""><span style="font-weight: bold;"
class="">To:</span></b> Kaloyan Kovachev
<a class="moz-txt-link-rfc2396E" href="mailto:kkovachev@varna.net"><kkovachev@varna.net></a>;
<a class="moz-txt-link-rfc2396E" href="mailto:asterisk-ss7@lists.digium.com">"asterisk-ss7@lists.digium.com"</a>
<a class="moz-txt-link-rfc2396E" href="mailto:asterisk-ss7@lists.digium.com"><asterisk-ss7@lists.digium.com></a> <br class=""
style="">
<b class="" style=""><span style="font-weight: bold;"
class="">Sent:</span></b> Friday, August 22, 2014
5:32 PM<br class="" style="">
<b class="" style=""><span style="font-weight: bold;"
class="">Subject:</span></b> Re: [asterisk-ss7] T38
fax issue<br class="" style="">
</font> </div>
<div class="" style=""><br class="" style="">
<div id="yiv1688099926" class="" style="">
<div class="" style="">
<table class="" style="" border="0" cellpadding="0"
cellspacing="0">
<tbody class="" style="">
<tr class="" style="">
<td colspan="1" rowspan="1" class="" style=""
valign="top">
<div dir="ltr" class="" style=""><font
class="" style="" size="2"><font class=""
style="" size="2">Hello</font></font><br
class="" style="" clear="none">
</div>
<div dir="ltr" class="" style=""><font
class="" style="" size="2"><font class=""
style="" size="2">Actually it will be
fine If I can send sip 488 not
acceptable here to the re invite of t38
.</font></font></div>
<div dir="ltr" class="" style=""><font
class="" style="" size="2"><font class=""
style="" size="2">But Asterisk is
sending sip 200 ok with voice codecs in
SDP.</font></font></div>
<div dir="ltr" class="" style=""><font
class="" style="" size="2"><font class=""
style="" size="2">So if i was able to
send sip 488 . The fax will contunie
with g711 </font></font></div>
<div dir="ltr" class="" style=""><font
class="" style="" size="2"><font class=""
style="" size="2">Setting
faxopt(gateway)=yes and t38pt_udptl =
yes,redundancy,maxdatagram=400 didnt
work. </font></font><br class=""
style="" clear="none">
<font class="" style="" size="2"><font
class="" style="" 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></div>
<div dir="ltr" class="" style=""><font
class="" style="" size="2"><font class=""
style="" size="2">Also disabling t38
with t38pt_udptl=no didnt change
anything. </font></font><br class=""
style="" clear="none">
<br class="" style="" clear="none">
</div>
<div dir="ltr" class="" style=""><font
class="" style="" size="2"><font class=""
style="" size="2">Regards</font></font><br
class="" style="" clear="none">
</div>
</td>
</tr>
</tbody>
</table>
<div class="" id="yiv1688099926yqt73711" style="">
<div id="yiv1688099926_origMsg_" class="" style="">
<div class="" style=""> <br class="" style=""
clear="none">
<div class="" style="">
<div style="font-size:0.9em;" class="">
<hr class="" style="" size="1"> <b class=""
style=""> <span style="font-weight:bold;"
class="">From:</span> </b> Kaloyan
Kovachev <a class="moz-txt-link-rfc2396E" href="mailto:kkovachev@varna.net"><kkovachev@varna.net></a>; <br
class="" style="" clear="none">
<b class="" style=""> <span
style="font-weight:bold;" class="">To:</span>
</b> Huseyin Kaya
<a class="moz-txt-link-rfc2396E" href="mailto:huseyinkaya@yahoo.com"><huseyinkaya@yahoo.com></a>;
<a class="moz-txt-link-rfc2396E" href="mailto:asterisk-ss7@lists.digium.com"><asterisk-ss7@lists.digium.com></a>; <br
class="" style="" clear="none">
<b class="" style=""> <span
style="font-weight:bold;" class="">Subject:</span>
</b> Re: [asterisk-ss7] T38 fax issue <br
class="" style="" clear="none">
<b class="" style=""> <span
style="font-weight:bold;" class="">Sent:</span>
</b> Fri, Aug 22, 2014 1:52:44 PM <br
class="" style="" clear="none">
</div>
<br class="" style="" clear="none">
<table class="" style="" border="0"
cellpadding="0" cellspacing="0">
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<tr class="" style="">
<td colspan="1" rowspan="1" class=""
style="" valign="top">Hi,<br class=""
style="" clear="none">
in addition to FAXOPT(gateway) you may
try to request transmission <br
class="" style="" clear="none">
medium from telco - see SS7_TMR or
SS7_TMR_NUM, as it should be set on <br
class="" style="" clear="none">
the outgoing (dahdi) channel you need
to set it on the SIP channel with <br
class="" style="" clear="none">
underscore (_SS7_TMR)<br class=""
style="" clear="none">
<br class="" style="" clear="none">
The possible options are defined in
libss7.h and SS7_TMR_3K1_AUDIO (or 3 <br
class="" style="" clear="none">
as num) works fine here. If you can
detect the fax calls you may request <br
class="" style="" clear="none">
64K_UNRESTRICTED data for them<br
class="" style="" clear="none">
<div class=""
id="yiv1688099926yqtfd89673"
style=""><br class="" style=""
clear="none">
On 2014-08-22 15:47, Huseyin Kaya
wrote:<br class="" style=""
clear="none">
<br class="" style="" clear="none">
> Hello<br class="" style=""
clear="none">
> <br class="" style=""
clear="none">
> I am using Sangoma A104DE with
libss7 on Asterisk 11.5.0 and <br
class="" style="" clear="none">
> terminating calls to telco with
ss7 . We are using patched version
of <br class="" style=""
clear="none">
> Libss7 that have timers <br
class="" style="" clear="none">
> functionality.(<a
moz-do-not-send="true"
rel="nofollow" shape="rect"
target="_blank"
href="https://issues.asterisk.org/jira/browse/SS7-27"
class="" style="">https://issues.asterisk.org/jira/browse/SS7-27</a>)<br
class="" style="" clear="none">
> <br class="" style=""
clear="none">
> The server is on production for
the last 6 months and everything was
<br class="" style="" clear="none">
> fine<br class="" style=""
clear="none">
> <br class="" style=""
clear="none">
> My interconnection with telco
is only one way. From sip to ss7 .<br
class="" style="" clear="none">
> <br class="" style=""
clear="none">
> Everything is fine except one
thing.<br class="" style=""
clear="none">
> <br class="" style=""
clear="none">
> One of my customers asked for
t38 faxing. then i found myself in <br
class="" style="" clear="none">
> trouble.<br class="" style=""
clear="none">
> <br class="" style=""
clear="none">
> I get several sip traces and
found the problem at the end .When i
<br class="" style="" clear="none">
> receive an invite T38 ,
asterisk is sending 200 OK message
but in SDP <br class="" style=""
clear="none">
> it is sending g711u,g711a,g729
as codecs. So after this point <br
class="" style="" clear="none">
> everything is messed up.<br
class="" style="" clear="none">
> <br class="" style=""
clear="none">
> I tried to set t38pt_udptl=no
in sip.conf , but still asterisk is
<br class="" style="" clear="none">
> sending sip 200 ok with sdp
g711...<br class="" style=""
clear="none">
> <br class="" style=""
clear="none">
> ı tried to set t38pt_udptl =
yes,redundancy,maxdatagram=400 and <br
class="" style="" clear="none">
> setvar=FAXOPT(gateway)=yes,20
in sip.conf but still i couldn't
manage <br class="" style=""
clear="none">
> to receive fax<br class=""
style="" clear="none">
> <br class="" style=""
clear="none">
> So basically what i need to
send fax from sip to telco but could
not <br class="" style=""
clear="none">
> manage to do till now.<br
class="" style="" clear="none">
> <br class="" style=""
clear="none">
> Everything except fax is
working like a charm.<br class=""
style="" clear="none">
> <br class="" style=""
clear="none">
> Is anyone succeed to handle fax
with libss7.<br class="" style=""
clear="none">
> <br class="" style=""
clear="none">
> I will be glad if an expert can
show me a way to achive this.<br
class="" style="" clear="none">
> <br class="" style=""
clear="none">
> Best Regards<br class=""
style="" clear="none">
</div>
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</blockquote>
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