I'm trying yo know what the remote end point brand/model/firmware/??? is but I could not get this information yet.<br>The other point says that after the T.38 SDP negotiation, there must be a "negotiation" (after the ACK of the T38 renegotiation there must be an exchange of Send preamble; DIS (and later DCS) that never happens...) and freeswitch does not start it and that is why the transmission results in a call drop after 25 seconds.<br>
<br><br>Thank you very much for your answers so far,<br>Samuel<br><br><div class="gmail_quote">On 15 June 2010 19:17, Steve Underwood <span dir="ltr"><<a href="mailto:steveu@coppice.org">steveu@coppice.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi,<br>
<br>
That png looks like an RTP packet being interpreted as if it were UDPTL.<br>
This is quite normal during switchover, as the two ends never switch at<br>
the same moment. If you see nothing arriving after those three packets,<br>
it looks like no T.38 packets arrive at all.<br>
<font color="#888888"><br>
Steve<br>
</font><div class="im"><br>
<br>
On 06/15/2010 11:41 PM, samuel wrote:<br>
> I got a pcap file and after the T.38 renegotiation, wireshark reports<br>
> T.38 Malformed packet from the "originator" A.B.C.D. It sends 3 of<br>
> these packets and then stops. From freeswitch I just see "Unknown RTP<br>
> version 0" packets going to A.B.C.D<br>
><br>
> I attach a png containing the wireshark malformed packet<br>
> "capture"..apologies in advanced but it's a few Kb and it's the<br>
> fastest way not to replace all "sensitive" information (IPs,<br>
> hostnames,etc...). Hope it passes the list filter..<br>
><br>
><br>
> On 15 June 2010 17:12, Anthony Minessale <<a href="mailto:anthony.minessale@gmail.com">anthony.minessale@gmail.com</a><br>
</div><div class="im">> <mailto:<a href="mailto:anthony.minessale@gmail.com">anthony.minessale@gmail.com</a>>> wrote:<br>
><br>
> did you watch it in a pcap?<br>
> Maybe it's one way audio.<br>
><br>
><br>
><br>
> On Tue, Jun 15, 2010 at 7:03 AM, samuel <<a href="mailto:samu60@gmail.com">samu60@gmail.com</a><br>
</div><div><div></div><div class="h5">> <mailto:<a href="mailto:samu60@gmail.com">samu60@gmail.com</a>>> wrote:<br>
><br>
> hi all,<br>
><br>
> recently testing T.38 unsuccesfully with freeswitch head<br>
> version (FreeSWITCH Version 1.0.head (git-) ) on a testing<br>
> server (2.6.26-2-xen-amd64)<br>
><br>
> remote SDP:<br>
><br>
> v=0<br>
> o=root 6039 6040 IN IP4 A.B.C.D<br>
> s=session<br>
> c=IN IP4 A.B.C.D<br>
> t=0 0<br>
> m=image 19423 udptl t38<br>
> a=T38FaxVersion:0<br>
> a=T38MaxBitRate:9600<br>
> a=T38FaxFillBitRemoval:0<br>
> a=T38FaxTranscodingMMR:0<br>
> a=T38FaxTranscodingJBIG:0<br>
> a=T38FaxRateManagement:transferredTCF<br>
> a=T38FaxMaxBuffer:72<br>
> a=T38FaxMaxDatagram:72<br>
> a=T38FaxUdpEC:t38UDPRedundancy<br>
><br>
> freeswitch answer:<br>
> v=0<br>
> o=FreeSWITCH 1276579579 1276579581 IN IP4 W.X.Y.Z<br>
> s=FreeSWITCH<br>
> c=IN IP4 W.X.Y.Z<br>
> t=0 0<br>
> m=image 22230 udptl t38<br>
> a=T38FaxVersion:0<br>
> a=T38MaxBitRate:14400<br>
> a=T38FaxFillBitRemoval<br>
> a=T38FaxRateManagement:transferredTCF<br>
> a=T38FaxMaxBuffer:2000<br>
> a=T38FaxMaxDatagram:400<br>
> a=T38FaxUdpEC:t38UDPRedundancy<br>
> a=T38VendorInfo:0 0 0<br>
><br>
><br>
> some debug:<br>
> 2010-06-15 13:37:13.234961 [DEBUG] mod_spandsp_fax.c:271 FLOW<br>
> T.30 T4 expired in phase T30_PHASE_B_RX, state 17<br>
> 2010-06-15 13:37:13.234961 [DEBUG] mod_spandsp_fax.c:271 FLOW<br>
> T.30 Too many retries. Giving up.<br>
> 2010-06-15 13:37:13.234961 [DEBUG] mod_spandsp_fax.c:271 FLOW<br>
> T.30 Changing from phase T30_PHASE_B_RX to T30_PHASE_D_TX<br>
> 2010-06-15 13:37:13.234961 [DEBUG] mod_spandsp_fax.c:271 FLOW<br>
> T.38T Set rx type 0<br>
> 2010-06-15 13:37:13.234961 [DEBUG] mod_spandsp_fax.c:271 FLOW<br>
> T.38T Set tx type 4<br>
> 2010-06-15 13:37:13.234961 [DEBUG] mod_spandsp_fax.c:271 FLOW<br>
> T.30 Changing from state 17 to 3<br>
> 2010-06-15 13:37:13.234961 [DEBUG] mod_spandsp_fax.c:271 FLOW<br>
> T.30 Tx: DCN with final frame tag<br>
> 2010-06-15 13:37:13.234961 [DEBUG] mod_spandsp_fax.c:271 FLOW<br>
> T.30 Tx: ff 13 fa<br>
> 2010-06-15 13:37:14.406960 [DEBUG] mod_spandsp_fax.c:271 FLOW<br>
> T.30 Send complete in phase T30_PHASE_D_TX, state 3<br>
> 2010-06-15 13:37:14.406960 [DEBUG] mod_spandsp_fax.c:271 FLOW<br>
> T.30 Send complete in phase T30_PHASE_D_TX, state 3<br>
> 2010-06-15 13:37:14.406960 [DEBUG] mod_spandsp_fax.c:271 FLOW<br>
> T.30 Disconnecting<br>
> 2010-06-15 13:37:14.406960 [DEBUG] mod_spandsp_fax.c:271 FLOW<br>
> T.30 Changing from phase T30_PHASE_D_TX to T30_PHASE_E<br>
> 2010-06-15 13:37:14.406960 [DEBUG] mod_spandsp_fax.c:271 FLOW<br>
> T.38T Set rx type 0<br>
> 2010-06-15 13:37:14.406960 [DEBUG] mod_spandsp_fax.c:271 FLOW<br>
> T.38T Set tx type 1<br>
> 2010-06-15 13:37:14.406960 [DEBUG] mod_spandsp_fax.c:271 FLOW<br>
> T.30 Changing from state 3 to 2<br>
> 2010-06-15 13:37:15.634931 [DEBUG] mod_spandsp_fax.c:271 FLOW<br>
> T.30 Send complete in phase T30_PHASE_E, state 2<br>
> 2010-06-15 13:37:15.634931 [DEBUG] mod_spandsp_fax.c:301<br>
> ==============================================================================<br>
> 2010-06-15 13:37:15.634931 [DEBUG] mod_spandsp_fax.c:313 Fax<br>
> processing not successful - result (48) Disconnected after<br>
> permitted retries.<br>
> 2010-06-15 13:37:15.634931 [DEBUG] mod_spandsp_fax.c:318<br>
> Remote station id:<br>
> 2010-06-15 13:37:15.634931 [DEBUG] mod_spandsp_fax.c:319 Local<br>
> station id: SpanDSP Fax Ident<br>
> 2010-06-15 13:37:15.634931 [DEBUG] mod_spandsp_fax.c:320 Pages<br>
> transferred: 0<br>
> 2010-06-15 13:37:15.634931 [DEBUG] mod_spandsp_fax.c:322 Total<br>
> fax pages: 0<br>
> 2010-06-15 13:37:15.634931 [DEBUG] mod_spandsp_fax.c:323 Image<br>
> resolution: 0x0<br>
> 2010-06-15 13:37:15.634931 [DEBUG] mod_spandsp_fax.c:324<br>
> Transfer Rate: 14400<br>
> 2010-06-15 13:37:15.634931 [DEBUG] mod_spandsp_fax.c:326 ECM<br>
> status off<br>
><br>
> I've starting learning about T3X and freswitch so I would like<br>
> whether someone can point me to any doc or any configuration<br>
> parameter that can solve the issue or at least debug it.<br>
><br>
> Thanks in advance,<br>
><br>
> Samuel<br>
><br>
<br>
<br>
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</div></div></blockquote></div><br>