Try on 1.4.21? We did fix an issue in this area where the CNG packets were causing issues with t.38.<div><br></div><div>/b<br><br>On Thursday, September 17, 2015, Markus Bönke <<a href="mailto:mbodbg@gmx.net">mbodbg@gmx.net</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><div>Hello,</div><div><br></div><div>I want to send a fax between two freeswitches (1.4.20) via T.38. On the SENDER freeswitch, I have Sangoma A104 TDM card and use the following dialplan: </div><div><br></div><div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(52,189,38);background-color:rgb(0,0,0)"><span style="color:#29f914"> </span><span style="color:#34bbc7"><action</span> application="export" data="fax_enable_t38=true"/<span style="color:#34bbc7">></span></div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)"><span style="color:#29f914"> </span><span style="color:rgb(41,249,20)"> </span><span style="color:rgb(52,187,199)"><action</span><span style="color:rgb(52,189,38)"> application="export" data="fax_enable_t38_request=true"/</span><span style="color:rgb(52,187,199)">></span></div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(52,189,38);background-color:rgb(0,0,0)"><span style="color:#29f914"> </span><span style="color:#34bbc7"><action</span> application="export" data="fax_verbose=true"/<span style="color:#34bbc7">></span></div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(52,189,38);background-color:rgb(0,0,0)"><span style="color:#29f914"> </span><span style="color:#34bbc7"><action</span> application="export" data="execute_on_answer=t38_gateway self"/<span style="color:#34bbc7">></span></div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)"><span style="color:#29f914"> </span><span style="color:rgb(41,249,20)"> </span><span style="color:rgb(52,187,199)"><action</span><span style="color:rgb(52,189,38)"> application="bridge" data="sofia/external/${destination_number}@${destination_ip}"/</span><span style="color:rgb(52,187,199)">></span></div></div><div><br></div><div>On the RECEIVER freeswitch I use the this dialplan:</div><div><br></div><div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(52,189,38);background-color:rgb(0,0,0)"><span style="color:#34bbc7"> <action</span> application="answer" /<span style="color:#34bbc7">></span></div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(52,189,38);background-color:rgb(0,0,0)"><span style="color:#29f914"> </span><span style="color:#34bbc7"><action</span> application="playback" data="silence_stream://2000"/<span style="color:#34bbc7">></span></div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(52,189,38);background-color:rgb(0,0,0)"><span style="color:#29f914"> </span><span style="color:#34bbc7"><action</span> application="set" data="fax_enable_t38_request=false"/<span style="color:#34bbc7">></span></div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(52,189,38);background-color:rgb(0,0,0)"><span style="color:#29f914"> </span><span style="color:#34bbc7"><action</span> application="export" data="fax_enable_t38=true"/<span style="color:#34bbc7">></span></div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(52,189,38);background-color:rgb(0,0,0)"><span style="color:#29f914"> </span><span style="color:#34bbc7"><action</span> application="rxfax" data="/tmp/FAX-${uuid}.tiff"/<span style="color:#34bbc7">></span></div></div><div><br></div><div>When I try to send a fax, on the RECEIVER freeswitch, I can see in the (second) INVITE the T.38 data is present: </div><div><br></div><div>...</div><div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)"> a=T38FaxVersion:0</div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)"> a=T38MaxBitRate:14400</div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)"> a=T38FaxFillBitRemoval</div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)"> a=T38FaxRateManagement:transferredTCF</div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)"> a=T38FaxMaxBuffer:2000</div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)"> a=T38FaxMaxDatagram:400</div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)"> a=T38FaxUdpEC:t38UDPRedundancy</div></div><div>…</div><div><br></div><div>On the SENDER side I can see that it tries to start the t38_gateway</div><div><br></div><div>…</div><div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)">2015-09-17 23:36:51.092799 [DEBUG] mod_spandsp_fax.c:286 FLOW T.38 Rx 2: IFP 00</div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)">2015-09-17 23:36:51.092799 [DEBUG] mod_spandsp_fax.c:286 FLOW T.38 Rx 2: indicator no-signal</div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)">2015-09-17 23:36:51.092799 [DEBUG] mod_spandsp_fax.c:286 FLOW T.38G Changing - (0) ced -> no-signal</div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)">2015-09-17 23:36:51.092799 [DEBUG] mod_spandsp_fax.c:286 FLOW T.38G Changing to no-signal</div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)">2015-09-17 23:36:51.092799 [DEBUG] mod_spandsp_fax.c:286 FLOW T.38G Non-ECM mode</div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)">2015-09-17 23:36:51.172799 [DEBUG] mod_spandsp_fax.c:286 FLOW T.38 Rx 3: IFP 06</div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)">2015-09-17 23:36:51.172799 [DEBUG] mod_spandsp_fax.c:286 FLOW T.38 Rx 3: indicator v21-preamble</div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)">2015-09-17 23:36:51.172799 [DEBUG] mod_spandsp_fax.c:286 FLOW T.38G Changing - (0) no-signal -> v21-preamble</div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)">2015-09-17 23:36:51.172799 [DEBUG] mod_spandsp_fax.c:286 FLOW T.38G Changing to v21-preamble</div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)">2015-09-17 23:36:51.172799 [DEBUG] mod_spandsp_fax.c:286 FLOW T.38G Non-ECM mode</div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)">2015-09-17 23:36:52.072799 [DEBUG] mod_spandsp_fax.c:286 FLOW T.38G HDLC underflow at 4</div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)">2015-09-17 23:36:52.172799 [DEBUG] mod_spandsp_fax.c:286 FLOW T.38 Rx 4: IFP c0 01 80 00 00 ff</div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)">2015-09-17 23:36:52.172799 [DEBUG] mod_spandsp_fax.c:286 FLOW T.38 Rx 4: (0) data v21/hdlc-data + 1 byte(s)</div></div><div>…</div><div><br></div><div>But then fails with a protocol error</div><div><br></div><div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)">2015-09-17 23:34:07.652799 [DEBUG] mod_spandsp_fax.c:286 FLOW T.38 Tx 1: indicator v21-preamble</div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(195,55,32);background-color:rgb(0,0,0)">2015-09-17 23:34:07.652799 [ERR] mod_spandsp_fax.c:659 INVALID WRITE: 8:3</div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(175,173,36);background-color:rgb(0,0,0)"><span style="color:rgb(195,55,32)">2015-09-17 23:34:07.652799 [ERR] mod_spandsp_fax.c:671 TERMINATING T30 STATE</span></div></div><div>…</div><div><div style="margin:0px;font-size:14px;font-family:Menlo;color:rgb(213,59,211);background-color:rgb(0,0,0)">2015-09-17 23:34:07.652799 [WARNING] mod_spandsp_fax.c:286 PROTOCOL_WARNING T.38 Tx packet handler failure</div></div><div><br></div><div>On the RECEIVER side the fax fails with „result (49) The call dropped prematurely“. Can this be because of a wrong configuration (dialplans/mod_spandsp), or is this a bug?</div><div><br></div><div>Thanks and Regards</div><div><br></div><div>Markus </div><div><br></div></div></blockquote></div><br><br>-- <br><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr">
<p><font face="courier new, monospace"><b><i><font size="4">Brian West</font></i></b><br><span style="font-size:x-small"><a href="mailto:brian@freeswitch.org" target="_blank">brian@freeswitch.org</a></span></font></p>
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