<div dir="ltr">Some carriers gateways doesn't like a T.38 invite on advance, usually the order that gives better results for faxing are first invite on PCMU/PCMA (or any other supported codec) and then re-invite to T.38.<div><br></div><div>Take a look at how gonicus gofaxip do-it (<a href="https://github.com/gonicus/gofaxip">https://github.com/gonicus/gofaxip</a>)</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Dec 1, 2017 at 10:21 PM, Kevin Olbrich <span dir="ltr"><<a href="mailto:ko@sv01.de" target="_blank">ko@sv01.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi!<div><br></div><div>Our carrier supports T.38 for outgoing faxes. I am trying to send faxes like this:</div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">originate {origination_caller_id_name='<wbr>kevin',origination_caller_id_<wbr>number='+49123456789',ignore_<wbr>early_media=true,absolute_<wbr>codec_string='PCMA,PCMU',fax_<wbr>use_ecm=true,fax_enable_t38=<wbr>true,fax_enable_t38_request=<wbr>true}sofia/gateway/carrier_1/+<wbr>4912121212 &txfax(/opt/faxout.tif)</blockquote><div><br></div><div><br></div><div>Log:</div><div><br></div><div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">668fd128-f2f5-4af5-9536-<wbr>6780762c2efa 2017-12-01 21:38:57.513164 [DEBUG] sofia_glue.c:1295 sofia/external/+4912121212 sending invite version: 1.6.19 -36-7a77e0b 64bit<br>668fd128-f2f5-4af5-9536-<wbr>6780762c2efa Local SDP:<br>668fd128-f2f5-4af5-9536-<wbr>6780762c2efa v=0<br>668fd128-f2f5-4af5-9536-<wbr>6780762c2efa o=FreeSWITCH 1512130268 1512130270 IN IP4 123.123.123.123<br>668fd128-f2f5-4af5-9536-<wbr>6780762c2efa s=FreeSWITCH<br>668fd128-f2f5-4af5-9536-<wbr>6780762c2efa c=IN IP4 123.123.123.123<br>668fd128-f2f5-4af5-9536-<wbr>6780762c2efa t=0 0<br>668fd128-f2f5-4af5-9536-<wbr>6780762c2efa m=image 30466 udptl t38<br>668fd128-f2f5-4af5-9536-<wbr>6780762c2efa a=T38FaxVersion:0<br>668fd128-f2f5-4af5-9536-<wbr>6780762c2efa a=T38MaxBitRate:14400<br>668fd128-f2f5-4af5-9536-<wbr>6780762c2efa a=T38FaxFillBitRemoval<br>668fd128-f2f5-4af5-9536-<wbr>6780762c2efa a=T38FaxRateManagement:<wbr>transferredTCF<br>668fd128-f2f5-4af5-9536-<wbr>6780762c2efa a=T38FaxMaxBuffer:2000<br>668fd128-f2f5-4af5-9536-<wbr>6780762c2efa a=T38FaxMaxDatagram:400<br>668fd128-f2f5-4af5-9536-<wbr>6780762c2efa a=T38FaxUdpEC:t38UDPRedundancy<br>668fd128-f2f5-4af5-9536-<wbr>6780762c2efa<br>668fd128-f2f5-4af5-9536-<wbr>6780762c2efa 2017-12-01 21:38:57.533158 [DEBUG] sofia.c:7084 Channel sofia/external/+4912121212 entering state [calling][0]<br>668fd128-f2f5-4af5-9536-<wbr>6780762c2efa 2017-12-01 21:38:57.673120 [DEBUG] sofia.c:6294 sofia/external/+4912121212 T38 invite failed<br>668fd128-f2f5-4af5-9536-<wbr>6780762c2efa 2017-12-01 21:38:57.673120 [DEBUG] sofia.c:7077 Channel sofia/external/+4912121212 skipping state [ready][488]</blockquote></div><div><div><div class="m_-8563254385554287724gmail_signature"><div dir="ltr"><div dir="ltr"><br><br></div><div>Carrier confirmed that T.38 is possible... What could be the cause for this? How can I enforce T.38 instead of falling back to g711a (hangup on failed invite)?</div><div><br></div><div>Thanks.</div><div dir="ltr"><br></div><div dir="ltr">Kind regards,<br>Kevin</div></div></div></div>
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