<div dir="ltr">Hi,<div>Seems to me that I'm not configuring something correctly or hitting some bug.</div><div>Reading <a href="https://wiki.freeswitch.org/wiki/Mod_spandsp#t38_gateway">https://wiki.freeswitch.org/wiki/Mod_spandsp#t38_gateway</a></div><div><br></div><div>I have a T.38 incapable provider that will respond with SIP 488 back.</div><div>If I leave T.38-passtrough and get 488 back, RTP stops and call is dropped. So I was trying to set up correct transcoding.</div><div><br></div><div>This is the scenario, with 3 identical FS:</div><div>1 - T.38 incapable server - PROVIDER</div><div>2 - T.38 capable - PROXY</div><div>3 - T.38 capable - PBX</div><div><div><br></div><div>PBX sends txfax (file.tiff) to PROXY which forwards call to PROVIDER (g.711).</div><div>PBX sends T.38 re-Invite, PROXY responds with 200 OK but then I have 2 scenarios: either passtrough T.38 which will invoke 488 and dropped call or I tried </div><div><pre style="font-family:monospace,Courier;padding:1em;border:1px dashed rgb(47,111,171);color:rgb(0,0,0);line-height:1.3em;font-size:12.8px;background-color:rgb(249,249,249)">sip_execute_on_image=t38_gateway peer nocng"</pre></div><div>but this doesn't send anything to PROVIDER but also call is dropped after BYE and 486 message.</div><div><br></div><div>Case that I'm hitting is similar to this:</div><div><p style="margin:0.4em 0px 0.5em;line-height:19.2px;color:rgb(0,0,0);font-family:sans-serif;font-size:12.8px">"If you want to transcode t.38 on leg a to audio on leg B when leg a invites t.38, but refuse all t.38 offers from leg b "</p></div><div>but to refuse t.38 invites from lag a.</div><div><br></div><div>The other way around, call from PROVIDER to PBX over PROXY is easely transcoded with </div><div><div><pre style="font-family:monospace,Courier;padding:1em;border:1px dashed rgb(47,111,171);color:rgb(0,0,0);line-height:1.3em;font-size:12.8px;background-color:rgb(249,249,249)">sip_execute_on_image=t38_gateway self nocng"</pre></div></div><div>on the PROXY side.</div><div><br></div><div><br></div><div>Is it normal behaviour that After failed t.38 negotiation or 488 message, fax call doesn't fall back to previous codec or t.30?</div><div><br></div><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr">Regards,<div>Mirko</div></div></div></div></div>
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