<div dir="ltr"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><i style="font-size:12.8px">NB. When was the last time you got a fax?!?</i></blockquote><div><i style="font-size:12.8px"><br></i></div><div><i style="font-size:12.8px">Good one :D</i></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Dec 8, 2017 at 10:00 AM, Callum Guy <span dir="ltr"><<a href="mailto:callum.guy@x-on.co.uk" target="_blank">callum.guy@x-on.co.uk</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">Mirko, Loi,<div><br></div><div>Thanks for your responses. I really wanted to check if there was anything obvious which our platform was not handling properly however your responses help to confirm that Fax/FOIP is rarely plain sailing. I had actually found Mirko's email thread before writing this - Brian's response was helpfully discouraging!</div><div><br></div><div>I'm not clear on whether it will be possible to remove the media proxy from the call path on this occasion but it is something I'll look into.</div><div><br></div><div>I will also look into finding resource to test on the latest stable release and see if the recent modifications are resolving this situation.</div><div><br></div><div>Once those avenues are exhausted I'll get on with the day job! If anyone does have other suggestions then please do get in touch. </div><div><br></div><div>Thanks again,<br></div><div><br></div><div>Callum</div><div><br></div><div><i>NB. When was the last time you got a fax?!?</i></div></div><br><div class="gmail_quote"><div dir="ltr">On Fri, Dec 8, 2017 at 4:36 AM Lợi Đặng <<a href="mailto:loi.dangthanh@gmail.com" target="_blank">loi.dangthanh@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div><div>Hi, media proxy mode is not willing to work fine with fax t38, since `t38_passthru=true` dont have any effect in that mode.<br></div>Could consider getting away from media proxy mode since it's not recommended anymore by FS's developers.<br></div>Btw, you may want to upgrade your FS to 1.6.15 or later.<br><a href="http://lists.freeswitch.org/pipermail/freeswitch-users/2017-January/124459.html" target="_blank">http://lists.freeswitch.org/<wbr>pipermail/freeswitch-users/<wbr>2017-January/124459.html</a><br><br></div>rgds, <br></div>Loi Dang<br></div><br><div class="gmail_quote"><div dir="ltr">On Fri, Dec 8, 2017 at 1:55 AM Mirko Brankovic <<a href="mailto:mirkobrankovic@gmail.com" target="_blank">mirkobrankovic@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto">I had a same question:<div dir="auto"><a href="http://thread.gmane.org/gmane.comp.telephony.freeswitch.user/86263" target="_blank">http://thread.gmane.org/gmane.<wbr>comp.telephony.freeswitch.<wbr>user/86263</a><br></div><div dir="auto">Sorry google lead me only to this link...</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Dec 7, 2017 18:06, "Callum Guy" <<a href="mailto:callum.guy@x-on.co.uk" target="_blank">callum.guy@x-on.co.uk</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi All,<div><br></div><div>I'll try and keep this simple. </div><div><br></div><div>We are experiencing difficulty transmitting fax with a certain UK provider (BT) who have suggested the fix for the fault is that we "<span style="color:rgb(38,50,56);font-family:Roboto,Arial,sans-serif;font-size:13px"><i>should fall back to using G711 pass through in order to negotiate/ send fax</i></span>"</div><div><br></div><div>The call initially connects with G711 (and the media is proxied). </div><div>Fax is detected by the originator which issues a RE-INVITE request to use T38. </div><div>This is rejected by the gateway with a 488 at which point we would expect the call to fall back to G711 however FreeSWITCH is reporting that this is not possible due to a media bug:</div><div><br></div><div>"<b><i>Session is connected to a media bug. Re-Negotiation implicitly disabled.</i></b>"</div><div><br></div><div>My understanding was that a media bug would be required for the initial fax tone detection which subsequently triggers the T38 session start? </div><div>Could anyone confirm whether we need to be looking into closing off the media bug manually or if there is an alternative route to resolving this issue?<br></div><div><br></div><div>We are running FreeSWITCH (Version 1.4.26 64bit). </div><div>Calls are dispatched with setting "t38_passthru=true".<br></div><div><br></div><div>Any help would be very much welcomed.</div><div><br></div><div>Best Regards,</div><div><br></div><div>Callum</div></div><div dir="ltr">-- <br></div><div class="m_2215745683688144401m_-1834679285343352442m_-6082805957522155953m_8318689368046879074gmail_signature" data-smartmail="gmail_signature"><div dir="ltr">Callum Guy<div>Head of Information Security</div><div>X-on</div></div></div>
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